diff options
| -rw-r--r-- | drivers/gpu/drm/mcde/mcde_display.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c index cac660ac8803..cbc7c0c4955a 100644 --- a/drivers/gpu/drm/mcde/mcde_display.c +++ b/drivers/gpu/drm/mcde/mcde_display.c @@ -333,7 +333,7 @@ static void mcde_configure_overlay(struct mcde *mcde, enum mcde_overlay ovl, enum mcde_extsrc src, enum mcde_channel ch, const struct drm_display_mode *mode, - u32 format) + u32 format, int cpp) { u32 val; u32 conf1; @@ -342,6 +342,7 @@ static void mcde_configure_overlay(struct mcde *mcde, enum mcde_overlay ovl, u32 ljinc; u32 cr; u32 comp; + u32 pixel_fetcher_watermark; switch (ovl) { case MCDE_OVERLAY_0: @@ -426,8 +427,33 @@ static void mcde_configure_overlay(struct mcde *mcde, enum mcde_overlay ovl, format); break; } - /* The default watermark level for overlay 0 is 48 */ - val |= 48 << MCDE_OVLXCONF2_PIXELFETCHERWATERMARKLEVEL_SHIFT; + + /* + * Pixel fetch watermark level is max 0x1FFF pixels. + * Two basic rules should be followed: + * 1. The value should be at least 256 bits. + * 2. The sum of all active overlays pixelfetch watermark level + * multiplied with bits per pixel, should be lower than the + * size of input_fifo_size in bits. + * 3. The value should be a multiple of a line (256 bits). + */ + switch (cpp) { + case 2: + pixel_fetcher_watermark = 128; + break; + case 3: + pixel_fetcher_watermark = 96; + break; + case 4: + pixel_fetcher_watermark = 48; + break; + default: + pixel_fetcher_watermark = 48; + break; + } + dev_dbg(mcde->dev, "pixel fetcher watermark level %d pixels\n", + pixel_fetcher_watermark); + val |= pixel_fetcher_watermark << MCDE_OVLXCONF2_PIXELFETCHERWATERMARKLEVEL_SHIFT; writel(val, mcde->regs + conf2); /* Number of bytes to fetch per line */ @@ -932,7 +958,7 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe, * channel 0 */ mcde_configure_overlay(mcde, MCDE_OVERLAY_0, MCDE_EXTSRC_0, - MCDE_CHANNEL_0, mode, format); + MCDE_CHANNEL_0, mode, format, cpp); /* * Configure pixel-per-line and line-per-frame for channel 0 and then |