From: Ville Syrjälä <ville.syrj...@linux.intel.com>
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.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_hdmi.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
b/drivers/gpu/drm/i915/intel_hdmi.c
index 393cd30..524962d 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -843,6 +843,30 @@ 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)
{
@@ -875,7 +899,8 @@ 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;
--
1.8.3.2
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