From 44706a87654bae810cc0740e9cafde134c5796f1 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Wed, 17 Oct 2012 13:24:57 +0000
Subject: [PATCH] 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>
---
drivers/video/tegra.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/video/tegra.c b/drivers/video/tegra.c
index ab26ad0958..750a283438 100644
--- a/drivers/video/tegra.c
+++ b/drivers/video/tegra.c
@@ -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);
}
--
2.39.5