This patch checks encoder level support for YCBCR420 outputs.
The logic goes as simple as this:
If the input mode is YCBCR420-only mode: prepare HDMI for
YCBCR420 output, else continue with RGB output mode.
It checks if the mode is YCBCR420 and source can support this
output then it marks the ycbcr_420 output indicator into crtc
state, for further staging in driver.
V2: Split the patch into two, kept helper functions in DRM layer.
V3: Changed the compute_config function based on new DRM API.
V4: Rebase
V5: Rebase
V6: Check and handle YCBCR420-only modes, discard the property
based approach (Ville)
V7: Addressed review comments from Ville
- add else case in 12BPC check.
- extract ycbcr420 state inside hdmi_12bpc_possible function.
V8: Addressed review comments from Ville
- Remove extra blank lines.
- Remove "HDMI" from the description of ycbcr420 state variable.
- Remove local variable, use crtc_state->ycbcr420 instead.
Added r-b from Ville.
Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
Cc: Daniel Vetter <daniel.vet...@intel.com>
Cc: Ander Conselvan de Oliveira <conselv...@gmail.com>
Reviewed-by: Ville Syrjala <ville.syrj...@linux.intel.com>
Signed-off-by: Shashank Sharma <shashank.sha...@intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 1 +
drivers/gpu/drm/i915/intel_drv.h | 3 +++
drivers/gpu/drm/i915/intel_hdmi.c | 40 +++++++++++++++++++++++++++++++++---
3 files changed, 41 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 2144adc..a5140e4 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11945,6 +11945,7 @@ intel_pipe_config_compare(struct drm_i915_private
*dev_priv,
PIPE_CONF_CHECK_I(hdmi_scrambling);
PIPE_CONF_CHECK_I(hdmi_high_tmds_clock_ratio);
PIPE_CONF_CHECK_I(has_infoframe);
+ PIPE_CONF_CHECK_I(ycbcr420);
PIPE_CONF_CHECK_I(has_audio);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index d17a324..372aebf 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -780,6 +780,9 @@ struct intel_crtc_state {
/* HDMI High TMDS char rate ratio */
bool hdmi_high_tmds_clock_ratio;
+
+ /* output format is YCBCR 4:2:0 */
+ bool ycbcr420;
};
struct intel_crtc {
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
b/drivers/gpu/drm/i915/intel_hdmi.c
index 2f831cf..64bb8cc 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1330,8 +1330,15 @@ static bool hdmi_12bpc_possible(struct intel_crtc_state
*crtc_state)
if (connector_state->crtc != crtc_state->base.crtc)
continue;
- if ((info->edid_hdmi_dc_modes & DRM_EDID_HDMI_DC_36) == 0)
- return false;
+ if (crtc_state->ycbcr420) {
+ const struct drm_hdmi_info *hdmi = &info->hdmi;
+
+ if (!(hdmi->y420_dc_modes & DRM_EDID_YCBCR420_DC_36))
+ return false;
+ } else {
+ if (!(info->edid_hdmi_dc_modes & DRM_EDID_HDMI_DC_36))
+ return false;
+ }
}
/* Display Wa #1139 */
@@ -1342,6 +1349,24 @@ static bool hdmi_12bpc_possible(struct intel_crtc_state
*crtc_state)
return true;
}
+static bool
+intel_hdmi_ycbcr420_config(struct drm_connector *connector,
+ struct intel_crtc_state *config,
+ int *clock_12bpc, int *clock_8bpc)
+{
+ if (!connector->ycbcr_420_allowed) {
+ DRM_ERROR("Platform doesn't support YCBCR420 output\n");
+ return false;
+ }
+
+ /* YCBCR420 TMDS rate requirement is half the pixel clock */
+ config->port_clock /= 2;
+ *clock_12bpc /= 2;
+ *clock_8bpc /= 2;
+ config->ycbcr420 = true;
+ return true;
+}
+
bool intel_hdmi_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state)
@@ -1349,7 +1374,8 @@ bool intel_hdmi_compute_config(struct intel_encoder
*encoder,
struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct drm_display_mode *adjusted_mode =
&pipe_config->base.adjusted_mode;
- struct drm_scdc *scdc = &conn_state->connector->display_info.hdmi.scdc;
+ struct drm_connector *connector = conn_state->connector;
+ struct drm_scdc *scdc = &connector->display_info.hdmi.scdc;
struct intel_digital_connector_state *intel_conn_state =
to_intel_digital_connector_state(conn_state);
int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
@@ -1379,6 +1405,14 @@ bool intel_hdmi_compute_config(struct intel_encoder
*encoder,
clock_12bpc *= 2;
}
+ if (drm_mode_is_420_only(&connector->display_info, adjusted_mode)) {
+ if (!intel_hdmi_ycbcr420_config(connector, pipe_config,
+ &clock_12bpc, &clock_8bpc)) {
+ DRM_ERROR("Can't support YCBCR420 output\n");
+ return false;
+ }
+ }
+
if (HAS_PCH_SPLIT(dev_priv) && !HAS_DDI(dev_priv))
pipe_config->has_pch_encoder = true;
--
2.7.4
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