Add support for selecting the required cache mode for the LCD:
off, write-through or write-back.
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v3:
- Handle a cached frame buffer out of normal U-Boot memory
drivers/video/tegra.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/drivers/video/tegra.c b/drivers/video/tegra.c
index 25ff64f..2f6655a 100644
--- a/drivers/video/tegra.c
+++ b/drivers/video/tegra.c
@@ -145,6 +145,7 @@ 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);
@@ -160,6 +161,16 @@ 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(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);
}
--
1.7.7.3
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