Now that we have a damage area tells us which parts of the frame buffer actually need updating, let's only dcache flush those on video_sync() calls. With this optimization in place, frame buffer updates - especially on large screen such as 4k displays - speed up significantly.
Signed-off-by: Alexander Graf agraf@csgraf.de Reported-by: Da Xue da@libre.computer --- drivers/video/video-uclass.c | 49 ++++++++++++++++++++++++++++++------ 1 file changed, 42 insertions(+), 7 deletions(-)
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c index 9ac1974670..5661beea38 100644 --- a/drivers/video/video-uclass.c +++ b/drivers/video/video-uclass.c @@ -222,6 +222,39 @@ int video_damage(struct udevice *vid, int x, int y, int width, int height) } #endif
+#if defined(CONFIG_ARM) && !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) +static void video_flush_dcache(struct udevice *vid) +{ + struct video_priv *priv = dev_get_uclass_priv(vid); + + if (!priv->flush_dcache) + return; + +#ifdef CONFIG_VIDEO_DAMAGE + if (priv->damage.endx && priv->damage.endy) { + int lstart = priv->damage.x * VNBYTES(priv->bpix); + int lend = priv->damage.endx * VNBYTES(priv->bpix); + int y; + + for (y = priv->damage.y; y < priv->damage.endy; y++) { + ulong fb = (ulong)priv->fb; + ulong start = fb + (y * priv->line_length) + lstart; + ulong end = start + lend; + + start = ALIGN_DOWN(start, CONFIG_SYS_CACHELINE_SIZE); + end = ALIGN(end, CONFIG_SYS_CACHELINE_SIZE); + + flush_dcache_range(start, end); + } + } +#else + flush_dcache_range((ulong)priv->fb, + ALIGN((ulong)priv->fb + priv->fb_size, + CONFIG_SYS_CACHELINE_SIZE)); +#endif +} +#endif + /* Flush video activity to the caches */ int video_sync(struct udevice *vid, bool force) { @@ -240,13 +273,7 @@ int video_sync(struct udevice *vid, bool force) * out whether it exists? For now, ARM is safe. */ #if defined(CONFIG_ARM) && !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) - struct video_priv *priv = dev_get_uclass_priv(vid); - - if (priv->flush_dcache) { - flush_dcache_range((ulong)priv->fb, - ALIGN((ulong)priv->fb + priv->fb_size, - CONFIG_SYS_CACHELINE_SIZE)); - } + video_flush_dcache(vid); #elif defined(CONFIG_VIDEO_SANDBOX_SDL) struct video_priv *priv = dev_get_uclass_priv(vid); static ulong last_sync; @@ -256,6 +283,14 @@ int video_sync(struct udevice *vid, bool force) last_sync = get_timer(0); } #endif + +#ifdef CONFIG_VIDEO_DAMAGE + struct video_priv *priv = dev_get_uclass_priv(vid); + + priv->damage.endx = 0; + priv->damage.endy = 0; +#endif + return 0; }