diff options
| author | Chao Jiang <chaoj@nvidia.com> | 2011-01-28 15:41:32 +0900 |
|---|---|---|
| committer | Varun Colbert <vcolbert@nvidia.com> | 2011-04-07 17:02:17 -0700 |
| commit | 4568d00bd2fd07a1202869980479e43cfe6cae82 (patch) | |
| tree | 2f0eaf215c63ca1451267dfb8921b63650328ec6 | |
| parent | e9b228e7aa05a98624510213a5a89e642ed272f4 (diff) | |
video: tegra: Limit error-diffusion dithering
Error-diffusion dithering on Tegra would never be enabled in video modes
where horizontal width exceeded 640 pixels. For large screen, either
24bit ture color or ordering dither may be used since it does not
require a line buffer.
Change-Id: If60a64858506ee96d444cb2cb3dcf7a1fbce5b1d
Reviewed-on: http://git-master/r/17393
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>
| -rw-r--r-- | drivers/video/tegra/dc/dc.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/video/tegra/dc/dc.c b/drivers/video/tegra/dc/dc.c index 6bdb79bbc79b..30d46d4e94e8 100644 --- a/drivers/video/tegra/dc/dc.c +++ b/drivers/video/tegra/dc/dc.c @@ -1102,6 +1102,12 @@ static void tegra_dc_set_color_control(struct tegra_dc *dc) color_control |= DITHER_CONTROL_ORDERED; break; case TEGRA_DC_ERRDIFF_DITHER: + /* The line buffer for error-diffusion dither is limited + * to 640 pixels per line. This limits the maximum + * horizontal active area size to 640 pixels when error + * diffusion is enabled. + */ + BUG_ON(dc->mode.h_active > 640); color_control |= DITHER_CONTROL_ERRDIFF; break; } |