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tegra: Support control of cache settings for LCD 

Add support for selecting the required cache mode for the LCD:
off, write-through or write-back.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Simon Glass 2012-10-17 13:24:57 +00:00 committed by Tom Warren
parent ad16617f74
commit 44706a8765
1 changed files with 11 additions and 0 deletions
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11
drivers/video/tegra.c
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@ -146,6 +146,7 @@ static void update_panel_size(struct fdt_disp_config *config)
void lcd_ctrl_init(void *lcdbase)
{
int line_length, size;
int type = DCACHE_OFF;
assert(disp_config);
@ -161,6 +162,16 @@ void lcd_ctrl_init(void *lcdbase)
update_panel_size(disp_config);
size = lcd_get_size(&line_length);
/* Set up the LCD caching as requested */
if (config.cache_type & FDT_LCD_CACHE_WRITE_THROUGH)
type = DCACHE_WRITETHROUGH;
else if (config.cache_type & FDT_LCD_CACHE_WRITE_BACK)
type = DCACHE_WRITEBACK;
mmu_set_region_dcache_behaviour(disp_config->frame_buffer, size, type);
/* Enable flushing after LCD writes if requested */
lcd_set_flush_dcache(config.cache_type & FDT_LCD_CACHE_FLUSH);
debug("LCD frame buffer at %p\n", lcd_base);
}