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drm/radeon: add a connector property for dither

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Allows you to enable dither in the display hardware
when the monitor supports lower a lower bpc than the
current framebuffer format.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2013-09-24 17:26:26 -04:00
parent 134b480f4b
commit 6214bb7487
7 changed files with 82 additions and 17 deletions
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11
drivers/gpu/drm/radeon/r600.c
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@@ -133,10 +133,13 @@ void dce3_program_fmt(struct drm_encoder *encoder)
struct drm_connector *connector = radeon_get_connector_for_encoder(encoder);
int bpc = 0;
u32 tmp = 0;
bool dither = false;
enum radeon_connector_dither dither = RADEON_FMT_DITHER_DISABLE;
if (connector)
if (connector) {
struct radeon_connector *radeon_connector = to_radeon_connector(connector);
bpc = radeon_get_monitor_bpc(connector);
dither = radeon_connector->dither;
}
/* LVDS FMT is set up by atom */
if (radeon_encoder->devices & ATOM_DEVICE_LCD_SUPPORT)
@@ -152,14 +155,14 @@ void dce3_program_fmt(struct drm_encoder *encoder)
switch (bpc) {
case 6:
if (dither)
if (dither == RADEON_FMT_DITHER_ENABLE)
/* XXX sort out optimal dither settings */
tmp |= FMT_SPATIAL_DITHER_EN;
else
tmp |= FMT_TRUNCATE_EN;
break;
case 8:
if (dither)
if (dither == RADEON_FMT_DITHER_ENABLE)
/* XXX sort out optimal dither settings */
tmp |= (FMT_SPATIAL_DITHER_EN | FMT_SPATIAL_DITHER_DEPTH);
else