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drm/i915: Don't use HDMI 12bpc when cloning with other encoder types

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When cloning HDMI with other output types, we can't use 12bpc since the
clocks for the other encoder types would be off. So have
intel_hdmi_compute_config() check if there are other encoders besides
HDMI being fed from the same pipe, and if so, pick 8bpc insted if 12bpc.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-03-03 16:15:29 +02:00 committed by Daniel Vetter
parent e8e6e6012d
commit 7180063295
1 changed files with 26 additions and 1 deletions
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27
drivers/gpu/drm/i915/intel_hdmi.c
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@ -848,6 +848,30 @@ intel_hdmi_mode_valid(struct drm_connector *connector,
return MODE_OK;
}
static bool hdmi_12bpc_possible(struct intel_crtc *crtc)
{
struct drm_device *dev = crtc->base.dev;
struct intel_encoder *encoder;
int count = 0, count_hdmi = 0;
if (!HAS_PCH_SPLIT(dev))
return false;
list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
if (encoder->new_crtc != crtc)
continue;
count_hdmi += encoder->type == INTEL_OUTPUT_HDMI;
count++;
}
/*
* HDMI 12bpc affects the clocks, so it's only possible
* when not cloning with other encoder types.
*/
return count_hdmi > 0 && count_hdmi == count;
}
bool intel_hdmi_compute_config(struct intel_encoder *encoder,
struct intel_crtc_config *pipe_config)
{
@ -880,7 +904,8 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
* within limits.
*/
if (pipe_config->pipe_bpp > 8*3 && intel_hdmi->has_hdmi_sink &&
clock_12bpc <= portclock_limit && HAS_PCH_SPLIT(dev)) {
clock_12bpc <= portclock_limit &&
hdmi_12bpc_possible(encoder->new_crtc)) {
DRM_DEBUG_KMS("picking bpc to 12 for HDMI output\n");
desired_bpp = 12*3;