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)
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 1 +
drivers/gpu/drm/i915/intel_drv.h | 3 +++
drivers/gpu/drm/i915/intel_hdmi.c | 42 +++++++++++++++++++++++++++++++++---
3 files changed, 43 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 4e03ca6..01900e1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11930,6 +11930,7 @@ 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..592243b 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;
+
+ /* HDMI output type */
+ bool ycbcr420;
};
struct intel_crtc {
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index cc0d100..276d916 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1305,7 +1305,8 @@ intel_hdmi_mode_valid(struct drm_connector *connector,
return status;
}
-static bool hdmi_12bpc_possible(struct intel_crtc_state *crtc_state)
+static bool hdmi_12bpc_possible(struct intel_crtc_state *crtc_state,
+ bool output_ycbcr420)
{
struct drm_i915_private *dev_priv =
to_i915(crtc_state->base.crtc->dev);
@@ -1330,6 +1331,13 @@ static bool hdmi_12bpc_possible(struct intel_crtc_state *crtc_state)
if (connector_state->crtc != crtc_state->base.crtc)
continue;
+ if (output_ycbcr420) {
+ const struct drm_hdmi_info *hdmi = &info->hdmi;
+
+ if (!(hdmi->y420_dc_modes & DRM_EDID_YCBCR420_DC_36))
+ return false;
+ }
+
if ((info->edid_hdmi_dc_modes & DRM_EDID_HDMI_DC_36) == 0)
return false;
}
@@ -1342,6 +1350,25 @@ 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 +1376,8 @@ 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 +1407,14 @@ 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;
@@ -1398,7 +1434,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
*/
if (pipe_config->pipe_bpp > 8*3 && pipe_config->has_hdmi_sink && !force_dvi &&
hdmi_port_clock_valid(intel_hdmi, clock_12bpc, true, force_dvi) == MODE_OK &&
- hdmi_12bpc_possible(pipe_config)) {
+ hdmi_12bpc_possible(pipe_config, pipe_config->ycbcr420)) {
DRM_DEBUG_KMS("picking bpc to 12 for HDMI output\n");
desired_bpp = 12*3;
--
2.7.4
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