tegra: video: Always use write-through cache on LCD

This seems to give the best performance, so let's use it always.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

diff --git a/drivers/video/tegra.c b/drivers/video/tegra.c
index 5c48c3b..217f05f 100644 (file)
--- a/drivers/video/tegra.c
+++ b/drivers/video/tegra.c
@@ -22,15 +22,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-enum lcd_cache_t {
-       FDT_LCD_CACHE_OFF               = 0,
-       FDT_LCD_CACHE_WRITE_THROUGH     = 1 << 0,
-       FDT_LCD_CACHE_WRITE_BACK        = 1 << 1,
-       FDT_LCD_CACHE_FLUSH             = 1 << 2,
-       FDT_LCD_CACHE_WRITE_BACK_FLUSH  = FDT_LCD_CACHE_WRITE_BACK |
-                                               FDT_LCD_CACHE_FLUSH,
-};
-
 /* Information about the display controller */
 struct tegra_lcd_priv {
        int width;                      /* width in pixels */
@@ -41,7 +32,6 @@ struct tegra_lcd_priv {
        struct disp_ctlr *disp;         /* Display controller to use */
        fdt_addr_t frame_buffer;        /* Address of frame buffer */
        unsigned pixel_clock;           /* Pixel clock in Hz */
-       enum lcd_cache_t cache_type;
 };
 
 enum {
@@ -310,7 +300,6 @@ static int tegra_lcd_probe(struct udevice *dev)
        struct video_priv *uc_priv = dev_get_uclass_priv(dev);
        struct tegra_lcd_priv *priv = dev_get_priv(dev);
        const void *blob = gd->fdt_blob;
-       int type = DCACHE_OFF;
        int ret;
 
        /* Initialize the Tegra display controller */
@@ -329,15 +318,11 @@ static int tegra_lcd_probe(struct udevice *dev)
                return ret;
        }
 
-       /* Set up the LCD caching as requested */
-       if (priv->cache_type & FDT_LCD_CACHE_WRITE_THROUGH)
-               type = DCACHE_WRITETHROUGH;
-       else if (priv->cache_type & FDT_LCD_CACHE_WRITE_BACK)
-               type = DCACHE_WRITEBACK;
-       mmu_set_region_dcache_behaviour(priv->frame_buffer, plat->size, type);
+       mmu_set_region_dcache_behaviour(priv->frame_buffer, plat->size,
+                                       DCACHE_WRITETHROUGH);
 
        /* Enable flushing after LCD writes if requested */
-       video_set_flush_dcache(dev, priv->cache_type & FDT_LCD_CACHE_FLUSH);
+       video_set_flush_dcache(dev, true);
 
        uc_priv->xsize = priv->width;
        uc_priv->ysize = priv->height;