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uboot/u-boot-stm32mp-2020.01/board/kosagi/novena/video.c

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2024-01-10 06:52:34 +00:00
// SPDX-License-Identifier: GPL-2.0+
/*
* Novena video output support
*
* IT6251 code based on code Copyright (C) 2014 Sean Cross
* from https://github.com/xobs/novena-linux.git commit
* 3d85836ee1377d445531928361809612aa0a18db
*
* Copyright (C) 2014 Marek Vasut <marex@denx.de>
*/
#include <common.h>
#include <linux/errno.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/crm_regs.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/iomux.h>
#include <asm/arch/mxc_hdmi.h>
#include <asm/arch/sys_proto.h>
#include <asm/mach-imx/iomux-v3.h>
#include <asm/mach-imx/mxc_i2c.h>
#include <asm/mach-imx/video.h>
#include <i2c.h>
#include <input.h>
#include <ipu_pixfmt.h>
#include <linux/fb.h>
#include <linux/input.h>
#include <malloc.h>
#include <stdio_dev.h>
#include "novena.h"
#define IT6251_VENDOR_ID_LOW 0x00
#define IT6251_VENDOR_ID_HIGH 0x01
#define IT6251_DEVICE_ID_LOW 0x02
#define IT6251_DEVICE_ID_HIGH 0x03
#define IT6251_SYSTEM_STATUS 0x0d
#define IT6251_SYSTEM_STATUS_RINTSTATUS (1 << 0)
#define IT6251_SYSTEM_STATUS_RHPDSTATUS (1 << 1)
#define IT6251_SYSTEM_STATUS_RVIDEOSTABLE (1 << 2)
#define IT6251_SYSTEM_STATUS_RPLL_IOLOCK (1 << 3)
#define IT6251_SYSTEM_STATUS_RPLL_XPLOCK (1 << 4)
#define IT6251_SYSTEM_STATUS_RPLL_SPLOCK (1 << 5)
#define IT6251_SYSTEM_STATUS_RAUXFREQ_LOCK (1 << 6)
#define IT6251_REF_STATE 0x0e
#define IT6251_REF_STATE_MAIN_LINK_DISABLED (1 << 0)
#define IT6251_REF_STATE_AUX_CHANNEL_READ (1 << 1)
#define IT6251_REF_STATE_CR_PATTERN (1 << 2)
#define IT6251_REF_STATE_EQ_PATTERN (1 << 3)
#define IT6251_REF_STATE_NORMAL_OPERATION (1 << 4)
#define IT6251_REF_STATE_MUTED (1 << 5)
#define IT6251_REG_PCLK_CNT_LOW 0x57
#define IT6251_REG_PCLK_CNT_HIGH 0x58
#define IT6521_RETRY_MAX 20
static int it6251_is_stable(void)
{
const unsigned int caddr = NOVENA_IT6251_CHIPADDR;
const unsigned int laddr = NOVENA_IT6251_LVDSADDR;
int status;
int clkcnt;
int rpclkcnt;
int refstate;
rpclkcnt = (i2c_reg_read(caddr, 0x13) & 0xff) |
((i2c_reg_read(caddr, 0x14) << 8) & 0x0f00);
debug("RPCLKCnt: %d\n", rpclkcnt);
status = i2c_reg_read(caddr, IT6251_SYSTEM_STATUS);
debug("System status: 0x%02x\n", status);
clkcnt = (i2c_reg_read(laddr, IT6251_REG_PCLK_CNT_LOW) & 0xff) |
((i2c_reg_read(laddr, IT6251_REG_PCLK_CNT_HIGH) << 8) &
0x0f00);
debug("Clock: 0x%02x\n", clkcnt);
refstate = i2c_reg_read(laddr, IT6251_REF_STATE);
debug("Ref Link State: 0x%02x\n", refstate);
if ((refstate & 0x1f) != 0)
return 0;
/* If video is muted, that's a failure */
if (refstate & IT6251_REF_STATE_MUTED)
return 0;
if (!(status & IT6251_SYSTEM_STATUS_RVIDEOSTABLE))
return 0;
return 1;
}
static int it6251_ready(void)
{
const unsigned int caddr = NOVENA_IT6251_CHIPADDR;
/* Test if the IT6251 came out of reset by reading ID regs. */
if (i2c_reg_read(caddr, IT6251_VENDOR_ID_LOW) != 0x15)
return 0;
if (i2c_reg_read(caddr, IT6251_VENDOR_ID_HIGH) != 0xca)
return 0;
if (i2c_reg_read(caddr, IT6251_DEVICE_ID_LOW) != 0x51)
return 0;
if (i2c_reg_read(caddr, IT6251_DEVICE_ID_HIGH) != 0x62)
return 0;
return 1;
}
static void it6251_program_regs(void)
{
const unsigned int caddr = NOVENA_IT6251_CHIPADDR;
const unsigned int laddr = NOVENA_IT6251_LVDSADDR;
i2c_reg_write(caddr, 0x05, 0x00);
mdelay(1);
/* set LVDSRX address, and enable */
i2c_reg_write(caddr, 0xfd, 0xbc);
i2c_reg_write(caddr, 0xfe, 0x01);
/*
* LVDSRX
*/
/* This write always fails, because the chip goes into reset */
/* reset LVDSRX */
i2c_reg_write(laddr, 0x05, 0xff);
i2c_reg_write(laddr, 0x05, 0x00);
/* reset LVDSRX PLL */
i2c_reg_write(laddr, 0x3b, 0x42);
i2c_reg_write(laddr, 0x3b, 0x43);
/* something with SSC PLL */
i2c_reg_write(laddr, 0x3c, 0x08);
/* don't swap links, but writing reserved registers */
i2c_reg_write(laddr, 0x0b, 0x88);
/* JEIDA, 8-bit depth 0x11, orig 0x42 */
i2c_reg_write(laddr, 0x2c, 0x01);
/* "reserved" */
i2c_reg_write(laddr, 0x32, 0x04);
/* "reserved" */
i2c_reg_write(laddr, 0x35, 0xe0);
/* "reserved" + clock delay */
i2c_reg_write(laddr, 0x2b, 0x24);
/* reset LVDSRX pix clock */
i2c_reg_write(laddr, 0x05, 0x02);
i2c_reg_write(laddr, 0x05, 0x00);
/*
* DPTX
*/
/* set for two lane mode, normal op, no swapping, no downspread */
i2c_reg_write(caddr, 0x16, 0x02);
/* some AUX channel EDID magic */
i2c_reg_write(caddr, 0x23, 0x40);
/* power down lanes 3-0 */
i2c_reg_write(caddr, 0x5c, 0xf3);
/* enable DP scrambling, change EQ CR phase */
i2c_reg_write(caddr, 0x5f, 0x06);
/* color mode RGB, pclk/2 */
i2c_reg_write(caddr, 0x60, 0x02);
/* dual pixel input mode, no EO swap, no RGB swap */
i2c_reg_write(caddr, 0x61, 0x04);
/* M444B24 video format */
i2c_reg_write(caddr, 0x62, 0x01);
/* vesa range / not interlace / vsync high / hsync high */
i2c_reg_write(caddr, 0xa0, 0x0F);
/* hpd event timer set to 1.6-ish ms */
i2c_reg_write(caddr, 0xc9, 0xf5);
/* more reserved magic */
i2c_reg_write(caddr, 0xca, 0x4d);
i2c_reg_write(caddr, 0xcb, 0x37);
/* enhanced framing mode, auto video fifo reset, video mute disable */
i2c_reg_write(caddr, 0xd3, 0x03);
/* "vidstmp" and some reserved stuff */
i2c_reg_write(caddr, 0xd4, 0x45);
/* queue number -- reserved */
i2c_reg_write(caddr, 0xe7, 0xa0);
/* info frame packets and reserved */
i2c_reg_write(caddr, 0xe8, 0x33);
/* more AVI stuff */
i2c_reg_write(caddr, 0xec, 0x00);
/* select PC master reg for aux channel? */
i2c_reg_write(caddr, 0x23, 0x42);
/* send PC request commands */
i2c_reg_write(caddr, 0x24, 0x00);
i2c_reg_write(caddr, 0x25, 0x00);
i2c_reg_write(caddr, 0x26, 0x00);
/* native aux read */
i2c_reg_write(caddr, 0x2b, 0x00);
/* back to internal */
i2c_reg_write(caddr, 0x23, 0x40);
/* voltage swing level 3 */
i2c_reg_write(caddr, 0x19, 0xff);
/* pre-emphasis level 3 */
i2c_reg_write(caddr, 0x1a, 0xff);
/* start link training */
i2c_reg_write(caddr, 0x17, 0x01);
}
static int it6251_init(void)
{
const unsigned int caddr = NOVENA_IT6251_CHIPADDR;
int reg;
int tries, retries = 0;
for (retries = 0; retries < IT6521_RETRY_MAX; retries++) {
/* Program the chip. */
it6251_program_regs();
/* Wait for video stable. */
for (tries = 0; tries < 100; tries++) {
reg = i2c_reg_read(caddr, 0x17);
/* Test Link CFG, STS, LCS read done. */
if ((reg & 0xe0) != 0xe0) {
/* Not yet, wait a bit more. */
mdelay(2);
continue;
}
/* Test if the video input is stable. */
if (it6251_is_stable())
return 0;
}
/*
* If we couldn't stabilize, requeue and try again,
* because it means that the LVDS channel isn't
* stable yet.
*/
printf("Display didn't stabilize.\n");
printf("This may be because the LVDS port is still in powersave mode.\n");
mdelay(50);
}
return -EINVAL;
}
static void enable_hdmi(struct display_info_t const *dev)
{
imx_enable_hdmi_phy();
}
static int lvds_enabled;
static void enable_lvds(struct display_info_t const *dev)
{
if (lvds_enabled)
return;
/* ITE IT6251 power enable. */
gpio_request(NOVENA_ITE6251_PWR_GPIO, "ite6251-power");
gpio_direction_output(NOVENA_ITE6251_PWR_GPIO, 0);
mdelay(10);
gpio_direction_output(NOVENA_ITE6251_PWR_GPIO, 1);
mdelay(20);
lvds_enabled = 1;
}
static int detect_lvds(struct display_info_t const *dev)
{
int ret, loops = 250;
enable_lvds(dev);
ret = i2c_set_bus_num(NOVENA_IT6251_I2C_BUS);
if (ret) {
puts("Cannot select IT6251 I2C bus.\n");
return 0;
}
/* Wait up-to ~250 mS for the LVDS to come up. */
while (--loops) {
ret = it6251_ready();
if (ret)
return ret;
mdelay(1);
}
return 0;
}
struct display_info_t const displays[] = {
{
/* HDMI Output */
.bus = -1,
.addr = 0,
.pixfmt = IPU_PIX_FMT_RGB24,
.detect = detect_hdmi,
.enable = enable_hdmi,
.mode = {
.name = "HDMI",
.refresh = 60,
.xres = 1024,
.yres = 768,
.pixclock = 15384,
.left_margin = 220,
.right_margin = 40,
.upper_margin = 21,
.lower_margin = 7,
.hsync_len = 60,
.vsync_len = 10,
.sync = FB_SYNC_EXT,
.vmode = FB_VMODE_NONINTERLACED
},
}, {
/* LVDS Output: N133HSE-EA1 Rev. C1 */
.bus = -1,
.pixfmt = IPU_PIX_FMT_RGB24,
.detect = detect_lvds,
.enable = enable_lvds,
.mode = {
.name = "Chimei-FHD",
.refresh = 60,
.xres = 1920,
.yres = 1080,
.pixclock = 15384,
.left_margin = 148,
.right_margin = 88,
.upper_margin = 36,
.lower_margin = 4,
.hsync_len = 44,
.vsync_len = 5,
.sync = FB_SYNC_HOR_HIGH_ACT |
FB_SYNC_VERT_HIGH_ACT |
FB_SYNC_EXT,
.vmode = FB_VMODE_NONINTERLACED,
},
},
};
size_t display_count = ARRAY_SIZE(displays);
static void enable_vpll(void)
{
struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
int timeout = 100000;
setbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_POWERDOWN);
clrsetbits_le32(&ccm->analog_pll_video,
BM_ANADIG_PLL_VIDEO_DIV_SELECT |
BM_ANADIG_PLL_VIDEO_POST_DIV_SELECT,
BF_ANADIG_PLL_VIDEO_DIV_SELECT(37) |
BF_ANADIG_PLL_VIDEO_POST_DIV_SELECT(1));
writel(BF_ANADIG_PLL_VIDEO_NUM_A(11), &ccm->analog_pll_video_num);
writel(BF_ANADIG_PLL_VIDEO_DENOM_B(12), &ccm->analog_pll_video_denom);
clrbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_POWERDOWN);
while (timeout--)
if (readl(&ccm->analog_pll_video) & BM_ANADIG_PLL_VIDEO_LOCK)
break;
if (timeout < 0)
printf("Warning: video pll lock timeout!\n");
clrsetbits_le32(&ccm->analog_pll_video,
BM_ANADIG_PLL_VIDEO_BYPASS,
BM_ANADIG_PLL_VIDEO_ENABLE);
}
void setup_display_clock(void)
{
struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
struct iomuxc *iomux = (struct iomuxc *)IOMUXC_BASE_ADDR;
enable_ipu_clock();
enable_vpll();
imx_setup_hdmi();
/* Turn on IPU LDB DI0 clocks */
setbits_le32(&mxc_ccm->CCGR3, MXC_CCM_CCGR3_LDB_DI0_MASK);
/* Switch LDB DI0 to PLL5 (Video PLL) */
clrsetbits_le32(&mxc_ccm->cs2cdr,
MXC_CCM_CS2CDR_LDB_DI0_CLK_SEL_MASK,
(0 << MXC_CCM_CS2CDR_LDB_DI0_CLK_SEL_OFFSET));
/* LDB clock div by 3.5 */
clrbits_le32(&mxc_ccm->cscmr2, MXC_CCM_CSCMR2_LDB_DI0_IPU_DIV);
/* DI0 clock derived from ldb_di0_clk */
clrsetbits_le32(&mxc_ccm->chsccdr,
MXC_CCM_CHSCCDR_IPU1_DI0_CLK_SEL_MASK,
(CHSCCDR_CLK_SEL_LDB_DI0 <<
MXC_CCM_CHSCCDR_IPU1_DI0_CLK_SEL_OFFSET)
);
/* Enable both LVDS channels, both connected to DI0. */
writel(IOMUXC_GPR2_DI0_VS_POLARITY_ACTIVE_HIGH |
IOMUXC_GPR2_BIT_MAPPING_CH1_JEIDA |
IOMUXC_GPR2_DATA_WIDTH_CH1_24BIT |
IOMUXC_GPR2_BIT_MAPPING_CH0_JEIDA |
IOMUXC_GPR2_DATA_WIDTH_CH0_24BIT |
IOMUXC_GPR2_SPLIT_MODE_EN_MASK |
IOMUXC_GPR2_LVDS_CH1_MODE_ENABLED_DI0 |
IOMUXC_GPR2_LVDS_CH0_MODE_ENABLED_DI0,
&iomux->gpr[2]);
clrsetbits_le32(&iomux->gpr[3],
IOMUXC_GPR3_LVDS0_MUX_CTL_MASK |
IOMUXC_GPR3_LVDS1_MUX_CTL_MASK,
(IOMUXC_GPR3_MUX_SRC_IPU1_DI0 <<
IOMUXC_GPR3_LVDS0_MUX_CTL_OFFSET) |
(IOMUXC_GPR3_MUX_SRC_IPU1_DI0 <<
IOMUXC_GPR3_LVDS1_MUX_CTL_OFFSET)
);
}
void setup_display_lvds(void)
{
int ret;
ret = i2c_set_bus_num(NOVENA_IT6251_I2C_BUS);
if (ret) {
puts("Cannot select LVDS-to-eDP I2C bus.\n");
return;
}
/* The IT6251 should be ready now, if it's not, it's not connected. */
ret = it6251_ready();
if (!ret)
return;
/* Init the LVDS-to-eDP chip and if it succeeded, enable backlight. */
ret = it6251_init();
if (!ret) {
gpio_request(NOVENA_BACKLIGHT_PWR_GPIO, "backlight-power");
gpio_request(NOVENA_BACKLIGHT_PWM_GPIO, "backlight-pwm");
/* Backlight power enable. */
gpio_direction_output(NOVENA_BACKLIGHT_PWR_GPIO, 1);
/* PWM backlight pin, always on for full brightness. */
gpio_direction_output(NOVENA_BACKLIGHT_PWM_GPIO, 1);
}
}