1356 lines
31 KiB
C
1356 lines
31 KiB
C
/*
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* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk.h>
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#include <linux/gpio/consumer.h>
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#include <linux/regulator/consumer.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_dp_helper.h>
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#include <drm/drm_edid.h>
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#include "edp.h"
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#include "edp.xml.h"
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#define VDDA_UA_ON_LOAD 100000 /* uA units */
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#define VDDA_UA_OFF_LOAD 100 /* uA units */
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#define DPCD_LINK_VOLTAGE_MAX 4
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#define DPCD_LINK_PRE_EMPHASIS_MAX 4
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#define EDP_LINK_BW_MAX DP_LINK_BW_2_7
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/* Link training return value */
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#define EDP_TRAIN_FAIL -1
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#define EDP_TRAIN_SUCCESS 0
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#define EDP_TRAIN_RECONFIG 1
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#define EDP_CLK_MASK_AHB BIT(0)
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#define EDP_CLK_MASK_AUX BIT(1)
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#define EDP_CLK_MASK_LINK BIT(2)
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#define EDP_CLK_MASK_PIXEL BIT(3)
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#define EDP_CLK_MASK_MDP_CORE BIT(4)
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#define EDP_CLK_MASK_LINK_CHAN (EDP_CLK_MASK_LINK | EDP_CLK_MASK_PIXEL)
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#define EDP_CLK_MASK_AUX_CHAN \
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(EDP_CLK_MASK_AHB | EDP_CLK_MASK_AUX | EDP_CLK_MASK_MDP_CORE)
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#define EDP_CLK_MASK_ALL (EDP_CLK_MASK_AUX_CHAN | EDP_CLK_MASK_LINK_CHAN)
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#define EDP_BACKLIGHT_MAX 255
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#define EDP_INTR_STATUS1 \
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(EDP_INTERRUPT_REG_1_HPD | EDP_INTERRUPT_REG_1_AUX_I2C_DONE | \
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EDP_INTERRUPT_REG_1_WRONG_ADDR | EDP_INTERRUPT_REG_1_TIMEOUT | \
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EDP_INTERRUPT_REG_1_NACK_DEFER | EDP_INTERRUPT_REG_1_WRONG_DATA_CNT | \
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EDP_INTERRUPT_REG_1_I2C_NACK | EDP_INTERRUPT_REG_1_I2C_DEFER | \
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EDP_INTERRUPT_REG_1_PLL_UNLOCK | EDP_INTERRUPT_REG_1_AUX_ERROR)
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#define EDP_INTR_MASK1 (EDP_INTR_STATUS1 << 2)
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#define EDP_INTR_STATUS2 \
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(EDP_INTERRUPT_REG_2_READY_FOR_VIDEO | \
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EDP_INTERRUPT_REG_2_IDLE_PATTERNs_SENT | \
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EDP_INTERRUPT_REG_2_FRAME_END | EDP_INTERRUPT_REG_2_CRC_UPDATED)
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#define EDP_INTR_MASK2 (EDP_INTR_STATUS2 << 2)
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struct edp_ctrl {
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struct platform_device *pdev;
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void __iomem *base;
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/* regulators */
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struct regulator *vdda_vreg; /* 1.8 V */
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struct regulator *lvl_vreg;
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/* clocks */
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struct clk *aux_clk;
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struct clk *pixel_clk;
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struct clk *ahb_clk;
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struct clk *link_clk;
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struct clk *mdp_core_clk;
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/* gpios */
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struct gpio_desc *panel_en_gpio;
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struct gpio_desc *panel_hpd_gpio;
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/* completion and mutex */
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struct completion idle_comp;
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struct mutex dev_mutex; /* To protect device power status */
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/* work queue */
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struct work_struct on_work;
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struct work_struct off_work;
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struct workqueue_struct *workqueue;
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/* Interrupt register lock */
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spinlock_t irq_lock;
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bool edp_connected;
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bool power_on;
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/* edid raw data */
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struct edid *edid;
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struct drm_dp_link dp_link;
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struct drm_dp_aux *drm_aux;
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/* dpcd raw data */
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u8 dpcd[DP_RECEIVER_CAP_SIZE];
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/* Link status */
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u8 link_rate;
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u8 lane_cnt;
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u8 v_level;
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u8 p_level;
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/* Timing status */
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u8 interlaced;
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u32 pixel_rate; /* in kHz */
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u32 color_depth;
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struct edp_aux *aux;
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struct edp_phy *phy;
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};
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struct edp_pixel_clk_div {
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u32 rate; /* in kHz */
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u32 m;
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u32 n;
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};
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#define EDP_PIXEL_CLK_NUM 8
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static const struct edp_pixel_clk_div clk_divs[2][EDP_PIXEL_CLK_NUM] = {
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{ /* Link clock = 162MHz, source clock = 810MHz */
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{119000, 31, 211}, /* WSXGA+ 1680x1050@60Hz CVT */
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{130250, 32, 199}, /* UXGA 1600x1200@60Hz CVT */
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{148500, 11, 60}, /* FHD 1920x1080@60Hz */
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{154000, 50, 263}, /* WUXGA 1920x1200@60Hz CVT */
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{209250, 31, 120}, /* QXGA 2048x1536@60Hz CVT */
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{268500, 119, 359}, /* WQXGA 2560x1600@60Hz CVT */
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{138530, 33, 193}, /* AUO B116HAN03.0 Panel */
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{141400, 48, 275}, /* AUO B133HTN01.2 Panel */
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},
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{ /* Link clock = 270MHz, source clock = 675MHz */
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{119000, 52, 295}, /* WSXGA+ 1680x1050@60Hz CVT */
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{130250, 11, 57}, /* UXGA 1600x1200@60Hz CVT */
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{148500, 11, 50}, /* FHD 1920x1080@60Hz */
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{154000, 47, 206}, /* WUXGA 1920x1200@60Hz CVT */
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{209250, 31, 100}, /* QXGA 2048x1536@60Hz CVT */
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{268500, 107, 269}, /* WQXGA 2560x1600@60Hz CVT */
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{138530, 63, 307}, /* AUO B116HAN03.0 Panel */
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{141400, 53, 253}, /* AUO B133HTN01.2 Panel */
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},
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};
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static int edp_clk_init(struct edp_ctrl *ctrl)
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{
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struct platform_device *pdev = ctrl->pdev;
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int ret;
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ctrl->aux_clk = msm_clk_get(pdev, "core");
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if (IS_ERR(ctrl->aux_clk)) {
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ret = PTR_ERR(ctrl->aux_clk);
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pr_err("%s: Can't find core clock, %d\n", __func__, ret);
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ctrl->aux_clk = NULL;
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return ret;
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}
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ctrl->pixel_clk = msm_clk_get(pdev, "pixel");
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if (IS_ERR(ctrl->pixel_clk)) {
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ret = PTR_ERR(ctrl->pixel_clk);
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pr_err("%s: Can't find pixel clock, %d\n", __func__, ret);
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ctrl->pixel_clk = NULL;
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return ret;
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}
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ctrl->ahb_clk = msm_clk_get(pdev, "iface");
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if (IS_ERR(ctrl->ahb_clk)) {
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ret = PTR_ERR(ctrl->ahb_clk);
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pr_err("%s: Can't find iface clock, %d\n", __func__, ret);
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ctrl->ahb_clk = NULL;
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return ret;
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}
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ctrl->link_clk = msm_clk_get(pdev, "link");
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if (IS_ERR(ctrl->link_clk)) {
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ret = PTR_ERR(ctrl->link_clk);
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pr_err("%s: Can't find link clock, %d\n", __func__, ret);
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ctrl->link_clk = NULL;
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return ret;
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}
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/* need mdp core clock to receive irq */
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ctrl->mdp_core_clk = msm_clk_get(pdev, "mdp_core");
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if (IS_ERR(ctrl->mdp_core_clk)) {
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ret = PTR_ERR(ctrl->mdp_core_clk);
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pr_err("%s: Can't find mdp_core clock, %d\n", __func__, ret);
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ctrl->mdp_core_clk = NULL;
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return ret;
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}
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return 0;
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}
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static int edp_clk_enable(struct edp_ctrl *ctrl, u32 clk_mask)
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{
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int ret;
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DBG("mask=%x", clk_mask);
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/* ahb_clk should be enabled first */
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if (clk_mask & EDP_CLK_MASK_AHB) {
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ret = clk_prepare_enable(ctrl->ahb_clk);
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if (ret) {
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pr_err("%s: Failed to enable ahb clk\n", __func__);
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goto f0;
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}
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}
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if (clk_mask & EDP_CLK_MASK_AUX) {
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ret = clk_set_rate(ctrl->aux_clk, 19200000);
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if (ret) {
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pr_err("%s: Failed to set rate aux clk\n", __func__);
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goto f1;
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}
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ret = clk_prepare_enable(ctrl->aux_clk);
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if (ret) {
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pr_err("%s: Failed to enable aux clk\n", __func__);
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goto f1;
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}
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}
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/* Need to set rate and enable link_clk prior to pixel_clk */
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if (clk_mask & EDP_CLK_MASK_LINK) {
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DBG("edp->link_clk, set_rate %ld",
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(unsigned long)ctrl->link_rate * 27000000);
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ret = clk_set_rate(ctrl->link_clk,
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(unsigned long)ctrl->link_rate * 27000000);
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if (ret) {
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pr_err("%s: Failed to set rate to link clk\n",
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__func__);
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goto f2;
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}
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ret = clk_prepare_enable(ctrl->link_clk);
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if (ret) {
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pr_err("%s: Failed to enable link clk\n", __func__);
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goto f2;
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}
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}
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if (clk_mask & EDP_CLK_MASK_PIXEL) {
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DBG("edp->pixel_clk, set_rate %ld",
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(unsigned long)ctrl->pixel_rate * 1000);
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ret = clk_set_rate(ctrl->pixel_clk,
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(unsigned long)ctrl->pixel_rate * 1000);
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if (ret) {
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pr_err("%s: Failed to set rate to pixel clk\n",
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__func__);
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goto f3;
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}
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ret = clk_prepare_enable(ctrl->pixel_clk);
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if (ret) {
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pr_err("%s: Failed to enable pixel clk\n", __func__);
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goto f3;
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}
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}
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if (clk_mask & EDP_CLK_MASK_MDP_CORE) {
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ret = clk_prepare_enable(ctrl->mdp_core_clk);
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if (ret) {
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pr_err("%s: Failed to enable mdp core clk\n", __func__);
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goto f4;
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}
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}
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return 0;
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f4:
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if (clk_mask & EDP_CLK_MASK_PIXEL)
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clk_disable_unprepare(ctrl->pixel_clk);
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f3:
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if (clk_mask & EDP_CLK_MASK_LINK)
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clk_disable_unprepare(ctrl->link_clk);
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f2:
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if (clk_mask & EDP_CLK_MASK_AUX)
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clk_disable_unprepare(ctrl->aux_clk);
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f1:
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if (clk_mask & EDP_CLK_MASK_AHB)
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clk_disable_unprepare(ctrl->ahb_clk);
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f0:
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return ret;
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}
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static void edp_clk_disable(struct edp_ctrl *ctrl, u32 clk_mask)
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{
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if (clk_mask & EDP_CLK_MASK_MDP_CORE)
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clk_disable_unprepare(ctrl->mdp_core_clk);
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if (clk_mask & EDP_CLK_MASK_PIXEL)
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clk_disable_unprepare(ctrl->pixel_clk);
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if (clk_mask & EDP_CLK_MASK_LINK)
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clk_disable_unprepare(ctrl->link_clk);
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if (clk_mask & EDP_CLK_MASK_AUX)
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clk_disable_unprepare(ctrl->aux_clk);
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if (clk_mask & EDP_CLK_MASK_AHB)
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clk_disable_unprepare(ctrl->ahb_clk);
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}
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static int edp_regulator_init(struct edp_ctrl *ctrl)
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{
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struct device *dev = &ctrl->pdev->dev;
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int ret;
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DBG("");
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ctrl->vdda_vreg = devm_regulator_get(dev, "vdda");
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ret = PTR_ERR_OR_ZERO(ctrl->vdda_vreg);
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if (ret) {
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pr_err("%s: Could not get vdda reg, ret = %d\n", __func__,
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ret);
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ctrl->vdda_vreg = NULL;
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return ret;
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}
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ctrl->lvl_vreg = devm_regulator_get(dev, "lvl-vdd");
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ret = PTR_ERR_OR_ZERO(ctrl->lvl_vreg);
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if (ret) {
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pr_err("%s: Could not get lvl-vdd reg, ret = %d\n", __func__,
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ret);
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ctrl->lvl_vreg = NULL;
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return ret;
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}
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return 0;
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}
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static int edp_regulator_enable(struct edp_ctrl *ctrl)
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{
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int ret;
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ret = regulator_set_load(ctrl->vdda_vreg, VDDA_UA_ON_LOAD);
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if (ret < 0) {
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pr_err("%s: vdda_vreg set regulator mode failed.\n", __func__);
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goto vdda_set_fail;
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}
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ret = regulator_enable(ctrl->vdda_vreg);
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if (ret) {
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pr_err("%s: Failed to enable vdda_vreg regulator.\n", __func__);
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goto vdda_enable_fail;
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}
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ret = regulator_enable(ctrl->lvl_vreg);
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if (ret) {
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pr_err("Failed to enable lvl-vdd reg regulator, %d", ret);
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goto lvl_enable_fail;
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}
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DBG("exit");
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return 0;
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lvl_enable_fail:
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regulator_disable(ctrl->vdda_vreg);
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vdda_enable_fail:
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regulator_set_load(ctrl->vdda_vreg, VDDA_UA_OFF_LOAD);
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vdda_set_fail:
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return ret;
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}
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static void edp_regulator_disable(struct edp_ctrl *ctrl)
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{
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regulator_disable(ctrl->lvl_vreg);
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regulator_disable(ctrl->vdda_vreg);
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regulator_set_load(ctrl->vdda_vreg, VDDA_UA_OFF_LOAD);
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}
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static int edp_gpio_config(struct edp_ctrl *ctrl)
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{
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struct device *dev = &ctrl->pdev->dev;
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int ret;
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ctrl->panel_hpd_gpio = devm_gpiod_get(dev, "panel-hpd", GPIOD_IN);
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if (IS_ERR(ctrl->panel_hpd_gpio)) {
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ret = PTR_ERR(ctrl->panel_hpd_gpio);
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ctrl->panel_hpd_gpio = NULL;
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pr_err("%s: cannot get panel-hpd-gpios, %d\n", __func__, ret);
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return ret;
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}
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ctrl->panel_en_gpio = devm_gpiod_get(dev, "panel-en", GPIOD_OUT_LOW);
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if (IS_ERR(ctrl->panel_en_gpio)) {
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ret = PTR_ERR(ctrl->panel_en_gpio);
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ctrl->panel_en_gpio = NULL;
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pr_err("%s: cannot get panel-en-gpios, %d\n", __func__, ret);
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return ret;
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}
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DBG("gpio on");
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return 0;
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}
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static void edp_ctrl_irq_enable(struct edp_ctrl *ctrl, int enable)
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{
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unsigned long flags;
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DBG("%d", enable);
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spin_lock_irqsave(&ctrl->irq_lock, flags);
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if (enable) {
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edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, EDP_INTR_MASK1);
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edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, EDP_INTR_MASK2);
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} else {
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edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, 0x0);
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edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, 0x0);
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}
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spin_unlock_irqrestore(&ctrl->irq_lock, flags);
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DBG("exit");
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}
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static void edp_fill_link_cfg(struct edp_ctrl *ctrl)
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{
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u32 prate;
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u32 lrate;
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u32 bpp;
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u8 max_lane = ctrl->dp_link.num_lanes;
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u8 lane;
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prate = ctrl->pixel_rate;
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bpp = ctrl->color_depth * 3;
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/*
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* By default, use the maximum link rate and minimum lane count,
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* so that we can do rate down shift during link training.
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*/
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ctrl->link_rate = drm_dp_link_rate_to_bw_code(ctrl->dp_link.rate);
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prate *= bpp;
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prate /= 8; /* in kByte */
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lrate = 270000; /* in kHz */
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lrate *= ctrl->link_rate;
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lrate /= 10; /* in kByte, 10 bits --> 8 bits */
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for (lane = 1; lane <= max_lane; lane <<= 1) {
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if (lrate >= prate)
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break;
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lrate <<= 1;
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}
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ctrl->lane_cnt = lane;
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DBG("rate=%d lane=%d", ctrl->link_rate, ctrl->lane_cnt);
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}
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static void edp_config_ctrl(struct edp_ctrl *ctrl)
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{
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u32 data;
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enum edp_color_depth depth;
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data = EDP_CONFIGURATION_CTRL_LANES(ctrl->lane_cnt - 1);
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if (ctrl->dp_link.capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
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data |= EDP_CONFIGURATION_CTRL_ENHANCED_FRAMING;
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depth = EDP_6BIT;
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if (ctrl->color_depth == 8)
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depth = EDP_8BIT;
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data |= EDP_CONFIGURATION_CTRL_COLOR(depth);
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if (!ctrl->interlaced) /* progressive */
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data |= EDP_CONFIGURATION_CTRL_PROGRESSIVE;
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data |= (EDP_CONFIGURATION_CTRL_SYNC_CLK |
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EDP_CONFIGURATION_CTRL_STATIC_MVID);
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edp_write(ctrl->base + REG_EDP_CONFIGURATION_CTRL, data);
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}
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static void edp_state_ctrl(struct edp_ctrl *ctrl, u32 state)
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{
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edp_write(ctrl->base + REG_EDP_STATE_CTRL, state);
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/* Make sure H/W status is set */
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wmb();
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}
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static int edp_lane_set_write(struct edp_ctrl *ctrl,
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u8 voltage_level, u8 pre_emphasis_level)
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{
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|
int i;
|
|
u8 buf[4];
|
|
|
|
if (voltage_level >= DPCD_LINK_VOLTAGE_MAX)
|
|
voltage_level |= 0x04;
|
|
|
|
if (pre_emphasis_level >= DPCD_LINK_PRE_EMPHASIS_MAX)
|
|
pre_emphasis_level |= 0x04;
|
|
|
|
pre_emphasis_level <<= 3;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
buf[i] = voltage_level | pre_emphasis_level;
|
|
|
|
DBG("%s: p|v=0x%x", __func__, voltage_level | pre_emphasis_level);
|
|
if (drm_dp_dpcd_write(ctrl->drm_aux, 0x103, buf, 4) < 4) {
|
|
pr_err("%s: Set sw/pe to panel failed\n", __func__);
|
|
return -ENOLINK;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int edp_train_pattern_set_write(struct edp_ctrl *ctrl, u8 pattern)
|
|
{
|
|
u8 p = pattern;
|
|
|
|
DBG("pattern=%x", p);
|
|
if (drm_dp_dpcd_write(ctrl->drm_aux,
|
|
DP_TRAINING_PATTERN_SET, &p, 1) < 1) {
|
|
pr_err("%s: Set training pattern to panel failed\n", __func__);
|
|
return -ENOLINK;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void edp_sink_train_set_adjust(struct edp_ctrl *ctrl,
|
|
const u8 *link_status)
|
|
{
|
|
int i;
|
|
u8 max = 0;
|
|
u8 data;
|
|
|
|
/* use the max level across lanes */
|
|
for (i = 0; i < ctrl->lane_cnt; i++) {
|
|
data = drm_dp_get_adjust_request_voltage(link_status, i);
|
|
DBG("lane=%d req_voltage_swing=0x%x", i, data);
|
|
if (max < data)
|
|
max = data;
|
|
}
|
|
|
|
ctrl->v_level = max >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
|
|
|
|
/* use the max level across lanes */
|
|
max = 0;
|
|
for (i = 0; i < ctrl->lane_cnt; i++) {
|
|
data = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
|
|
DBG("lane=%d req_pre_emphasis=0x%x", i, data);
|
|
if (max < data)
|
|
max = data;
|
|
}
|
|
|
|
ctrl->p_level = max >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
|
|
DBG("v_level=%d, p_level=%d", ctrl->v_level, ctrl->p_level);
|
|
}
|
|
|
|
static void edp_host_train_set(struct edp_ctrl *ctrl, u32 train)
|
|
{
|
|
int cnt = 10;
|
|
u32 data;
|
|
u32 shift = train - 1;
|
|
|
|
DBG("train=%d", train);
|
|
|
|
edp_state_ctrl(ctrl, EDP_STATE_CTRL_TRAIN_PATTERN_1 << shift);
|
|
while (--cnt) {
|
|
data = edp_read(ctrl->base + REG_EDP_MAINLINK_READY);
|
|
if (data & (EDP_MAINLINK_READY_TRAIN_PATTERN_1_READY << shift))
|
|
break;
|
|
}
|
|
|
|
if (cnt == 0)
|
|
pr_err("%s: set link_train=%d failed\n", __func__, train);
|
|
}
|
|
|
|
static const u8 vm_pre_emphasis[4][4] = {
|
|
{0x03, 0x06, 0x09, 0x0C}, /* pe0, 0 db */
|
|
{0x03, 0x06, 0x09, 0xFF}, /* pe1, 3.5 db */
|
|
{0x03, 0x06, 0xFF, 0xFF}, /* pe2, 6.0 db */
|
|
{0x03, 0xFF, 0xFF, 0xFF} /* pe3, 9.5 db */
|
|
};
|
|
|
|
/* voltage swing, 0.2v and 1.0v are not support */
|
|
static const u8 vm_voltage_swing[4][4] = {
|
|
{0x14, 0x18, 0x1A, 0x1E}, /* sw0, 0.4v */
|
|
{0x18, 0x1A, 0x1E, 0xFF}, /* sw1, 0.6 v */
|
|
{0x1A, 0x1E, 0xFF, 0xFF}, /* sw1, 0.8 v */
|
|
{0x1E, 0xFF, 0xFF, 0xFF} /* sw1, 1.2 v, optional */
|
|
};
|
|
|
|
static int edp_voltage_pre_emphasise_set(struct edp_ctrl *ctrl)
|
|
{
|
|
u32 value0;
|
|
u32 value1;
|
|
|
|
DBG("v=%d p=%d", ctrl->v_level, ctrl->p_level);
|
|
|
|
value0 = vm_pre_emphasis[(int)(ctrl->v_level)][(int)(ctrl->p_level)];
|
|
value1 = vm_voltage_swing[(int)(ctrl->v_level)][(int)(ctrl->p_level)];
|
|
|
|
/* Configure host and panel only if both values are allowed */
|
|
if (value0 != 0xFF && value1 != 0xFF) {
|
|
msm_edp_phy_vm_pe_cfg(ctrl->phy, value0, value1);
|
|
return edp_lane_set_write(ctrl, ctrl->v_level, ctrl->p_level);
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int edp_start_link_train_1(struct edp_ctrl *ctrl)
|
|
{
|
|
u8 link_status[DP_LINK_STATUS_SIZE];
|
|
u8 old_v_level;
|
|
int tries;
|
|
int ret;
|
|
int rlen;
|
|
|
|
DBG("");
|
|
|
|
edp_host_train_set(ctrl, DP_TRAINING_PATTERN_1);
|
|
ret = edp_voltage_pre_emphasise_set(ctrl);
|
|
if (ret)
|
|
return ret;
|
|
ret = edp_train_pattern_set_write(ctrl,
|
|
DP_TRAINING_PATTERN_1 | DP_RECOVERED_CLOCK_OUT_EN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
tries = 0;
|
|
old_v_level = ctrl->v_level;
|
|
while (1) {
|
|
drm_dp_link_train_clock_recovery_delay(ctrl->dpcd);
|
|
|
|
rlen = drm_dp_dpcd_read_link_status(ctrl->drm_aux, link_status);
|
|
if (rlen < DP_LINK_STATUS_SIZE) {
|
|
pr_err("%s: read link status failed\n", __func__);
|
|
return -ENOLINK;
|
|
}
|
|
if (drm_dp_clock_recovery_ok(link_status, ctrl->lane_cnt)) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
if (ctrl->v_level == DPCD_LINK_VOLTAGE_MAX) {
|
|
ret = -1;
|
|
break;
|
|
}
|
|
|
|
if (old_v_level == ctrl->v_level) {
|
|
tries++;
|
|
if (tries >= 5) {
|
|
ret = -1;
|
|
break;
|
|
}
|
|
} else {
|
|
tries = 0;
|
|
old_v_level = ctrl->v_level;
|
|
}
|
|
|
|
edp_sink_train_set_adjust(ctrl, link_status);
|
|
ret = edp_voltage_pre_emphasise_set(ctrl);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int edp_start_link_train_2(struct edp_ctrl *ctrl)
|
|
{
|
|
u8 link_status[DP_LINK_STATUS_SIZE];
|
|
int tries = 0;
|
|
int ret;
|
|
int rlen;
|
|
|
|
DBG("");
|
|
|
|
edp_host_train_set(ctrl, DP_TRAINING_PATTERN_2);
|
|
ret = edp_voltage_pre_emphasise_set(ctrl);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = edp_train_pattern_set_write(ctrl,
|
|
DP_TRAINING_PATTERN_2 | DP_RECOVERED_CLOCK_OUT_EN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
while (1) {
|
|
drm_dp_link_train_channel_eq_delay(ctrl->dpcd);
|
|
|
|
rlen = drm_dp_dpcd_read_link_status(ctrl->drm_aux, link_status);
|
|
if (rlen < DP_LINK_STATUS_SIZE) {
|
|
pr_err("%s: read link status failed\n", __func__);
|
|
return -ENOLINK;
|
|
}
|
|
if (drm_dp_channel_eq_ok(link_status, ctrl->lane_cnt)) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
tries++;
|
|
if (tries > 10) {
|
|
ret = -1;
|
|
break;
|
|
}
|
|
|
|
edp_sink_train_set_adjust(ctrl, link_status);
|
|
ret = edp_voltage_pre_emphasise_set(ctrl);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int edp_link_rate_down_shift(struct edp_ctrl *ctrl)
|
|
{
|
|
u32 prate, lrate, bpp;
|
|
u8 rate, lane, max_lane;
|
|
int changed = 0;
|
|
|
|
rate = ctrl->link_rate;
|
|
lane = ctrl->lane_cnt;
|
|
max_lane = ctrl->dp_link.num_lanes;
|
|
|
|
bpp = ctrl->color_depth * 3;
|
|
prate = ctrl->pixel_rate;
|
|
prate *= bpp;
|
|
prate /= 8; /* in kByte */
|
|
|
|
if (rate > DP_LINK_BW_1_62 && rate <= EDP_LINK_BW_MAX) {
|
|
rate -= 4; /* reduce rate */
|
|
changed++;
|
|
}
|
|
|
|
if (changed) {
|
|
if (lane >= 1 && lane < max_lane)
|
|
lane <<= 1; /* increase lane */
|
|
|
|
lrate = 270000; /* in kHz */
|
|
lrate *= rate;
|
|
lrate /= 10; /* kByte, 10 bits --> 8 bits */
|
|
lrate *= lane;
|
|
|
|
DBG("new lrate=%u prate=%u(kHz) rate=%d lane=%d p=%u b=%d",
|
|
lrate, prate, rate, lane,
|
|
ctrl->pixel_rate,
|
|
bpp);
|
|
|
|
if (lrate > prate) {
|
|
ctrl->link_rate = rate;
|
|
ctrl->lane_cnt = lane;
|
|
DBG("new rate=%d %d", rate, lane);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int edp_clear_training_pattern(struct edp_ctrl *ctrl)
|
|
{
|
|
int ret;
|
|
|
|
ret = edp_train_pattern_set_write(ctrl, 0);
|
|
|
|
drm_dp_link_train_channel_eq_delay(ctrl->dpcd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int edp_do_link_train(struct edp_ctrl *ctrl)
|
|
{
|
|
int ret;
|
|
struct drm_dp_link dp_link;
|
|
|
|
DBG("");
|
|
/*
|
|
* Set the current link rate and lane cnt to panel. They may have been
|
|
* adjusted and the values are different from them in DPCD CAP
|
|
*/
|
|
dp_link.num_lanes = ctrl->lane_cnt;
|
|
dp_link.rate = drm_dp_bw_code_to_link_rate(ctrl->link_rate);
|
|
dp_link.capabilities = ctrl->dp_link.capabilities;
|
|
if (drm_dp_link_configure(ctrl->drm_aux, &dp_link) < 0)
|
|
return EDP_TRAIN_FAIL;
|
|
|
|
ctrl->v_level = 0; /* start from default level */
|
|
ctrl->p_level = 0;
|
|
|
|
edp_state_ctrl(ctrl, 0);
|
|
if (edp_clear_training_pattern(ctrl))
|
|
return EDP_TRAIN_FAIL;
|
|
|
|
ret = edp_start_link_train_1(ctrl);
|
|
if (ret < 0) {
|
|
if (edp_link_rate_down_shift(ctrl) == 0) {
|
|
DBG("link reconfig");
|
|
ret = EDP_TRAIN_RECONFIG;
|
|
goto clear;
|
|
} else {
|
|
pr_err("%s: Training 1 failed", __func__);
|
|
ret = EDP_TRAIN_FAIL;
|
|
goto clear;
|
|
}
|
|
}
|
|
DBG("Training 1 completed successfully");
|
|
|
|
edp_state_ctrl(ctrl, 0);
|
|
if (edp_clear_training_pattern(ctrl))
|
|
return EDP_TRAIN_FAIL;
|
|
|
|
ret = edp_start_link_train_2(ctrl);
|
|
if (ret < 0) {
|
|
if (edp_link_rate_down_shift(ctrl) == 0) {
|
|
DBG("link reconfig");
|
|
ret = EDP_TRAIN_RECONFIG;
|
|
goto clear;
|
|
} else {
|
|
pr_err("%s: Training 2 failed", __func__);
|
|
ret = EDP_TRAIN_FAIL;
|
|
goto clear;
|
|
}
|
|
}
|
|
DBG("Training 2 completed successfully");
|
|
|
|
edp_state_ctrl(ctrl, EDP_STATE_CTRL_SEND_VIDEO);
|
|
clear:
|
|
edp_clear_training_pattern(ctrl);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void edp_clock_synchrous(struct edp_ctrl *ctrl, int sync)
|
|
{
|
|
u32 data;
|
|
enum edp_color_depth depth;
|
|
|
|
data = edp_read(ctrl->base + REG_EDP_MISC1_MISC0);
|
|
|
|
if (sync)
|
|
data |= EDP_MISC1_MISC0_SYNC;
|
|
else
|
|
data &= ~EDP_MISC1_MISC0_SYNC;
|
|
|
|
/* only legacy rgb mode supported */
|
|
depth = EDP_6BIT; /* Default */
|
|
if (ctrl->color_depth == 8)
|
|
depth = EDP_8BIT;
|
|
else if (ctrl->color_depth == 10)
|
|
depth = EDP_10BIT;
|
|
else if (ctrl->color_depth == 12)
|
|
depth = EDP_12BIT;
|
|
else if (ctrl->color_depth == 16)
|
|
depth = EDP_16BIT;
|
|
|
|
data |= EDP_MISC1_MISC0_COLOR(depth);
|
|
|
|
edp_write(ctrl->base + REG_EDP_MISC1_MISC0, data);
|
|
}
|
|
|
|
static int edp_sw_mvid_nvid(struct edp_ctrl *ctrl, u32 m, u32 n)
|
|
{
|
|
u32 n_multi, m_multi = 5;
|
|
|
|
if (ctrl->link_rate == DP_LINK_BW_1_62) {
|
|
n_multi = 1;
|
|
} else if (ctrl->link_rate == DP_LINK_BW_2_7) {
|
|
n_multi = 2;
|
|
} else {
|
|
pr_err("%s: Invalid link rate, %d\n", __func__,
|
|
ctrl->link_rate);
|
|
return -EINVAL;
|
|
}
|
|
|
|
edp_write(ctrl->base + REG_EDP_SOFTWARE_MVID, m * m_multi);
|
|
edp_write(ctrl->base + REG_EDP_SOFTWARE_NVID, n * n_multi);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void edp_mainlink_ctrl(struct edp_ctrl *ctrl, int enable)
|
|
{
|
|
u32 data = 0;
|
|
|
|
edp_write(ctrl->base + REG_EDP_MAINLINK_CTRL, EDP_MAINLINK_CTRL_RESET);
|
|
/* Make sure fully reset */
|
|
wmb();
|
|
usleep_range(500, 1000);
|
|
|
|
if (enable)
|
|
data |= EDP_MAINLINK_CTRL_ENABLE;
|
|
|
|
edp_write(ctrl->base + REG_EDP_MAINLINK_CTRL, data);
|
|
}
|
|
|
|
static void edp_ctrl_phy_aux_enable(struct edp_ctrl *ctrl, int enable)
|
|
{
|
|
if (enable) {
|
|
edp_regulator_enable(ctrl);
|
|
edp_clk_enable(ctrl, EDP_CLK_MASK_AUX_CHAN);
|
|
msm_edp_phy_ctrl(ctrl->phy, 1);
|
|
msm_edp_aux_ctrl(ctrl->aux, 1);
|
|
gpiod_set_value(ctrl->panel_en_gpio, 1);
|
|
} else {
|
|
gpiod_set_value(ctrl->panel_en_gpio, 0);
|
|
msm_edp_aux_ctrl(ctrl->aux, 0);
|
|
msm_edp_phy_ctrl(ctrl->phy, 0);
|
|
edp_clk_disable(ctrl, EDP_CLK_MASK_AUX_CHAN);
|
|
edp_regulator_disable(ctrl);
|
|
}
|
|
}
|
|
|
|
static void edp_ctrl_link_enable(struct edp_ctrl *ctrl, int enable)
|
|
{
|
|
u32 m, n;
|
|
|
|
if (enable) {
|
|
/* Enable link channel clocks */
|
|
edp_clk_enable(ctrl, EDP_CLK_MASK_LINK_CHAN);
|
|
|
|
msm_edp_phy_lane_power_ctrl(ctrl->phy, true, ctrl->lane_cnt);
|
|
|
|
msm_edp_phy_vm_pe_init(ctrl->phy);
|
|
|
|
/* Make sure phy is programed */
|
|
wmb();
|
|
msm_edp_phy_ready(ctrl->phy);
|
|
|
|
edp_config_ctrl(ctrl);
|
|
msm_edp_ctrl_pixel_clock_valid(ctrl, ctrl->pixel_rate, &m, &n);
|
|
edp_sw_mvid_nvid(ctrl, m, n);
|
|
edp_mainlink_ctrl(ctrl, 1);
|
|
} else {
|
|
edp_mainlink_ctrl(ctrl, 0);
|
|
|
|
msm_edp_phy_lane_power_ctrl(ctrl->phy, false, 0);
|
|
edp_clk_disable(ctrl, EDP_CLK_MASK_LINK_CHAN);
|
|
}
|
|
}
|
|
|
|
static int edp_ctrl_training(struct edp_ctrl *ctrl)
|
|
{
|
|
int ret;
|
|
|
|
/* Do link training only when power is on */
|
|
if (!ctrl->power_on)
|
|
return -EINVAL;
|
|
|
|
train_start:
|
|
ret = edp_do_link_train(ctrl);
|
|
if (ret == EDP_TRAIN_RECONFIG) {
|
|
/* Re-configure main link */
|
|
edp_ctrl_irq_enable(ctrl, 0);
|
|
edp_ctrl_link_enable(ctrl, 0);
|
|
msm_edp_phy_ctrl(ctrl->phy, 0);
|
|
|
|
/* Make sure link is fully disabled */
|
|
wmb();
|
|
usleep_range(500, 1000);
|
|
|
|
msm_edp_phy_ctrl(ctrl->phy, 1);
|
|
edp_ctrl_link_enable(ctrl, 1);
|
|
edp_ctrl_irq_enable(ctrl, 1);
|
|
goto train_start;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void edp_ctrl_on_worker(struct work_struct *work)
|
|
{
|
|
struct edp_ctrl *ctrl = container_of(
|
|
work, struct edp_ctrl, on_work);
|
|
int ret;
|
|
|
|
mutex_lock(&ctrl->dev_mutex);
|
|
|
|
if (ctrl->power_on) {
|
|
DBG("already on");
|
|
goto unlock_ret;
|
|
}
|
|
|
|
edp_ctrl_phy_aux_enable(ctrl, 1);
|
|
edp_ctrl_link_enable(ctrl, 1);
|
|
|
|
edp_ctrl_irq_enable(ctrl, 1);
|
|
ret = drm_dp_link_power_up(ctrl->drm_aux, &ctrl->dp_link);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
ctrl->power_on = true;
|
|
|
|
/* Start link training */
|
|
ret = edp_ctrl_training(ctrl);
|
|
if (ret != EDP_TRAIN_SUCCESS)
|
|
goto fail;
|
|
|
|
DBG("DONE");
|
|
goto unlock_ret;
|
|
|
|
fail:
|
|
edp_ctrl_irq_enable(ctrl, 0);
|
|
edp_ctrl_link_enable(ctrl, 0);
|
|
edp_ctrl_phy_aux_enable(ctrl, 0);
|
|
ctrl->power_on = false;
|
|
unlock_ret:
|
|
mutex_unlock(&ctrl->dev_mutex);
|
|
}
|
|
|
|
static void edp_ctrl_off_worker(struct work_struct *work)
|
|
{
|
|
struct edp_ctrl *ctrl = container_of(
|
|
work, struct edp_ctrl, off_work);
|
|
unsigned long time_left;
|
|
|
|
mutex_lock(&ctrl->dev_mutex);
|
|
|
|
if (!ctrl->power_on) {
|
|
DBG("already off");
|
|
goto unlock_ret;
|
|
}
|
|
|
|
reinit_completion(&ctrl->idle_comp);
|
|
edp_state_ctrl(ctrl, EDP_STATE_CTRL_PUSH_IDLE);
|
|
|
|
time_left = wait_for_completion_timeout(&ctrl->idle_comp,
|
|
msecs_to_jiffies(500));
|
|
if (!time_left)
|
|
DBG("%s: idle pattern timedout\n", __func__);
|
|
|
|
edp_state_ctrl(ctrl, 0);
|
|
|
|
drm_dp_link_power_down(ctrl->drm_aux, &ctrl->dp_link);
|
|
|
|
edp_ctrl_irq_enable(ctrl, 0);
|
|
|
|
edp_ctrl_link_enable(ctrl, 0);
|
|
|
|
edp_ctrl_phy_aux_enable(ctrl, 0);
|
|
|
|
ctrl->power_on = false;
|
|
|
|
unlock_ret:
|
|
mutex_unlock(&ctrl->dev_mutex);
|
|
}
|
|
|
|
irqreturn_t msm_edp_ctrl_irq(struct edp_ctrl *ctrl)
|
|
{
|
|
u32 isr1, isr2, mask1, mask2;
|
|
u32 ack;
|
|
|
|
DBG("");
|
|
spin_lock(&ctrl->irq_lock);
|
|
isr1 = edp_read(ctrl->base + REG_EDP_INTERRUPT_REG_1);
|
|
isr2 = edp_read(ctrl->base + REG_EDP_INTERRUPT_REG_2);
|
|
|
|
mask1 = isr1 & EDP_INTR_MASK1;
|
|
mask2 = isr2 & EDP_INTR_MASK2;
|
|
|
|
isr1 &= ~mask1; /* remove masks bit */
|
|
isr2 &= ~mask2;
|
|
|
|
DBG("isr=%x mask=%x isr2=%x mask2=%x",
|
|
isr1, mask1, isr2, mask2);
|
|
|
|
ack = isr1 & EDP_INTR_STATUS1;
|
|
ack <<= 1; /* ack bits */
|
|
ack |= mask1;
|
|
edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, ack);
|
|
|
|
ack = isr2 & EDP_INTR_STATUS2;
|
|
ack <<= 1; /* ack bits */
|
|
ack |= mask2;
|
|
edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, ack);
|
|
spin_unlock(&ctrl->irq_lock);
|
|
|
|
if (isr1 & EDP_INTERRUPT_REG_1_HPD)
|
|
DBG("edp_hpd");
|
|
|
|
if (isr2 & EDP_INTERRUPT_REG_2_READY_FOR_VIDEO)
|
|
DBG("edp_video_ready");
|
|
|
|
if (isr2 & EDP_INTERRUPT_REG_2_IDLE_PATTERNs_SENT) {
|
|
DBG("idle_patterns_sent");
|
|
complete(&ctrl->idle_comp);
|
|
}
|
|
|
|
msm_edp_aux_irq(ctrl->aux, isr1);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void msm_edp_ctrl_power(struct edp_ctrl *ctrl, bool on)
|
|
{
|
|
if (on)
|
|
queue_work(ctrl->workqueue, &ctrl->on_work);
|
|
else
|
|
queue_work(ctrl->workqueue, &ctrl->off_work);
|
|
}
|
|
|
|
int msm_edp_ctrl_init(struct msm_edp *edp)
|
|
{
|
|
struct edp_ctrl *ctrl = NULL;
|
|
struct device *dev = &edp->pdev->dev;
|
|
int ret;
|
|
|
|
if (!edp) {
|
|
pr_err("%s: edp is NULL!\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
|
|
if (!ctrl)
|
|
return -ENOMEM;
|
|
|
|
edp->ctrl = ctrl;
|
|
ctrl->pdev = edp->pdev;
|
|
|
|
ctrl->base = msm_ioremap(ctrl->pdev, "edp", "eDP");
|
|
if (IS_ERR(ctrl->base))
|
|
return PTR_ERR(ctrl->base);
|
|
|
|
/* Get regulator, clock, gpio, pwm */
|
|
ret = edp_regulator_init(ctrl);
|
|
if (ret) {
|
|
pr_err("%s:regulator init fail\n", __func__);
|
|
return ret;
|
|
}
|
|
ret = edp_clk_init(ctrl);
|
|
if (ret) {
|
|
pr_err("%s:clk init fail\n", __func__);
|
|
return ret;
|
|
}
|
|
ret = edp_gpio_config(ctrl);
|
|
if (ret) {
|
|
pr_err("%s:failed to configure GPIOs: %d", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Init aux and phy */
|
|
ctrl->aux = msm_edp_aux_init(dev, ctrl->base, &ctrl->drm_aux);
|
|
if (!ctrl->aux || !ctrl->drm_aux) {
|
|
pr_err("%s:failed to init aux\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ctrl->phy = msm_edp_phy_init(dev, ctrl->base);
|
|
if (!ctrl->phy) {
|
|
pr_err("%s:failed to init phy\n", __func__);
|
|
ret = -ENOMEM;
|
|
goto err_destory_aux;
|
|
}
|
|
|
|
spin_lock_init(&ctrl->irq_lock);
|
|
mutex_init(&ctrl->dev_mutex);
|
|
init_completion(&ctrl->idle_comp);
|
|
|
|
/* setup workqueue */
|
|
ctrl->workqueue = alloc_ordered_workqueue("edp_drm_work", 0);
|
|
INIT_WORK(&ctrl->on_work, edp_ctrl_on_worker);
|
|
INIT_WORK(&ctrl->off_work, edp_ctrl_off_worker);
|
|
|
|
return 0;
|
|
|
|
err_destory_aux:
|
|
msm_edp_aux_destroy(dev, ctrl->aux);
|
|
ctrl->aux = NULL;
|
|
return ret;
|
|
}
|
|
|
|
void msm_edp_ctrl_destroy(struct edp_ctrl *ctrl)
|
|
{
|
|
if (!ctrl)
|
|
return;
|
|
|
|
if (ctrl->workqueue) {
|
|
flush_workqueue(ctrl->workqueue);
|
|
destroy_workqueue(ctrl->workqueue);
|
|
ctrl->workqueue = NULL;
|
|
}
|
|
|
|
if (ctrl->aux) {
|
|
msm_edp_aux_destroy(&ctrl->pdev->dev, ctrl->aux);
|
|
ctrl->aux = NULL;
|
|
}
|
|
|
|
kfree(ctrl->edid);
|
|
ctrl->edid = NULL;
|
|
|
|
mutex_destroy(&ctrl->dev_mutex);
|
|
}
|
|
|
|
bool msm_edp_ctrl_panel_connected(struct edp_ctrl *ctrl)
|
|
{
|
|
mutex_lock(&ctrl->dev_mutex);
|
|
DBG("connect status = %d", ctrl->edp_connected);
|
|
if (ctrl->edp_connected) {
|
|
mutex_unlock(&ctrl->dev_mutex);
|
|
return true;
|
|
}
|
|
|
|
if (!ctrl->power_on) {
|
|
edp_ctrl_phy_aux_enable(ctrl, 1);
|
|
edp_ctrl_irq_enable(ctrl, 1);
|
|
}
|
|
|
|
if (drm_dp_dpcd_read(ctrl->drm_aux, DP_DPCD_REV, ctrl->dpcd,
|
|
DP_RECEIVER_CAP_SIZE) < DP_RECEIVER_CAP_SIZE) {
|
|
pr_err("%s: AUX channel is NOT ready\n", __func__);
|
|
memset(ctrl->dpcd, 0, DP_RECEIVER_CAP_SIZE);
|
|
} else {
|
|
ctrl->edp_connected = true;
|
|
}
|
|
|
|
if (!ctrl->power_on) {
|
|
edp_ctrl_irq_enable(ctrl, 0);
|
|
edp_ctrl_phy_aux_enable(ctrl, 0);
|
|
}
|
|
|
|
DBG("exit: connect status=%d", ctrl->edp_connected);
|
|
|
|
mutex_unlock(&ctrl->dev_mutex);
|
|
|
|
return ctrl->edp_connected;
|
|
}
|
|
|
|
int msm_edp_ctrl_get_panel_info(struct edp_ctrl *ctrl,
|
|
struct drm_connector *connector, struct edid **edid)
|
|
{
|
|
int ret = 0;
|
|
|
|
mutex_lock(&ctrl->dev_mutex);
|
|
|
|
if (ctrl->edid) {
|
|
if (edid) {
|
|
DBG("Just return edid buffer");
|
|
*edid = ctrl->edid;
|
|
}
|
|
goto unlock_ret;
|
|
}
|
|
|
|
if (!ctrl->power_on) {
|
|
edp_ctrl_phy_aux_enable(ctrl, 1);
|
|
edp_ctrl_irq_enable(ctrl, 1);
|
|
}
|
|
|
|
ret = drm_dp_link_probe(ctrl->drm_aux, &ctrl->dp_link);
|
|
if (ret) {
|
|
pr_err("%s: read dpcd cap failed, %d\n", __func__, ret);
|
|
goto disable_ret;
|
|
}
|
|
|
|
/* Initialize link rate as panel max link rate */
|
|
ctrl->link_rate = drm_dp_link_rate_to_bw_code(ctrl->dp_link.rate);
|
|
|
|
ctrl->edid = drm_get_edid(connector, &ctrl->drm_aux->ddc);
|
|
if (!ctrl->edid) {
|
|
pr_err("%s: edid read fail\n", __func__);
|
|
goto disable_ret;
|
|
}
|
|
|
|
if (edid)
|
|
*edid = ctrl->edid;
|
|
|
|
disable_ret:
|
|
if (!ctrl->power_on) {
|
|
edp_ctrl_irq_enable(ctrl, 0);
|
|
edp_ctrl_phy_aux_enable(ctrl, 0);
|
|
}
|
|
unlock_ret:
|
|
mutex_unlock(&ctrl->dev_mutex);
|
|
return ret;
|
|
}
|
|
|
|
int msm_edp_ctrl_timing_cfg(struct edp_ctrl *ctrl,
|
|
const struct drm_display_mode *mode,
|
|
const struct drm_display_info *info)
|
|
{
|
|
u32 hstart_from_sync, vstart_from_sync;
|
|
u32 data;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&ctrl->dev_mutex);
|
|
/*
|
|
* Need to keep color depth, pixel rate and
|
|
* interlaced information in ctrl context
|
|
*/
|
|
ctrl->color_depth = info->bpc;
|
|
ctrl->pixel_rate = mode->clock;
|
|
ctrl->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
|
|
|
|
/* Fill initial link config based on passed in timing */
|
|
edp_fill_link_cfg(ctrl);
|
|
|
|
if (edp_clk_enable(ctrl, EDP_CLK_MASK_AHB)) {
|
|
pr_err("%s, fail to prepare enable ahb clk\n", __func__);
|
|
ret = -EINVAL;
|
|
goto unlock_ret;
|
|
}
|
|
edp_clock_synchrous(ctrl, 1);
|
|
|
|
/* Configure eDP timing to HW */
|
|
edp_write(ctrl->base + REG_EDP_TOTAL_HOR_VER,
|
|
EDP_TOTAL_HOR_VER_HORIZ(mode->htotal) |
|
|
EDP_TOTAL_HOR_VER_VERT(mode->vtotal));
|
|
|
|
vstart_from_sync = mode->vtotal - mode->vsync_start;
|
|
hstart_from_sync = mode->htotal - mode->hsync_start;
|
|
edp_write(ctrl->base + REG_EDP_START_HOR_VER_FROM_SYNC,
|
|
EDP_START_HOR_VER_FROM_SYNC_HORIZ(hstart_from_sync) |
|
|
EDP_START_HOR_VER_FROM_SYNC_VERT(vstart_from_sync));
|
|
|
|
data = EDP_HSYNC_VSYNC_WIDTH_POLARITY_VERT(
|
|
mode->vsync_end - mode->vsync_start);
|
|
data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_HORIZ(
|
|
mode->hsync_end - mode->hsync_start);
|
|
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
|
|
data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_NVSYNC;
|
|
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
|
|
data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_NHSYNC;
|
|
edp_write(ctrl->base + REG_EDP_HSYNC_VSYNC_WIDTH_POLARITY, data);
|
|
|
|
edp_write(ctrl->base + REG_EDP_ACTIVE_HOR_VER,
|
|
EDP_ACTIVE_HOR_VER_HORIZ(mode->hdisplay) |
|
|
EDP_ACTIVE_HOR_VER_VERT(mode->vdisplay));
|
|
|
|
edp_clk_disable(ctrl, EDP_CLK_MASK_AHB);
|
|
|
|
unlock_ret:
|
|
mutex_unlock(&ctrl->dev_mutex);
|
|
return ret;
|
|
}
|
|
|
|
bool msm_edp_ctrl_pixel_clock_valid(struct edp_ctrl *ctrl,
|
|
u32 pixel_rate, u32 *pm, u32 *pn)
|
|
{
|
|
const struct edp_pixel_clk_div *divs;
|
|
u32 err = 1; /* 1% error tolerance */
|
|
u32 clk_err;
|
|
int i;
|
|
|
|
if (ctrl->link_rate == DP_LINK_BW_1_62) {
|
|
divs = clk_divs[0];
|
|
} else if (ctrl->link_rate == DP_LINK_BW_2_7) {
|
|
divs = clk_divs[1];
|
|
} else {
|
|
pr_err("%s: Invalid link rate,%d\n", __func__, ctrl->link_rate);
|
|
return false;
|
|
}
|
|
|
|
for (i = 0; i < EDP_PIXEL_CLK_NUM; i++) {
|
|
clk_err = abs(divs[i].rate - pixel_rate);
|
|
if ((divs[i].rate * err / 100) >= clk_err) {
|
|
if (pm)
|
|
*pm = divs[i].m;
|
|
if (pn)
|
|
*pn = divs[i].n;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
DBG("pixel clock %d(kHz) not supported", pixel_rate);
|
|
|
|
return false;
|
|
}
|
|
|