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[U-Boot,v5,13/16] tegra: Support control of cache settings for LCD

Message ID 1349732556-30700-14-git-send-email-sjg@chromium.org
State Superseded, archived
Delegated to: Tom Warren
Headers show

Commit Message

Simon Glass Oct. 8, 2012, 9:42 p.m. UTC 
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>
---
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(-)
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Patch

diff --git a/drivers/video/tegra.c b/drivers/video/tegra.c
index 9df2bd3..ff2b70e 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);
 }