On Fri, Aug 24, 2018 at 06:02:16PM -0700, Radhakrishna Sripada wrote:
> At times 12bpc HDMI cannot be driven due to faulty cables, dongles
> level shifters etc. To workaround them we may need to drive the output
> at a lower bpc. Currently the user space does not have a way to limit
> the bpc. The default bpc to be programmed is decided by the driver and
> is run against connector limitations.
>
> Creating a new connector property "max bpc" in order to limit the bpc
> with which the pixels are scanned out. xrandr can make use of this
> connector property to make sure that bpc does not exceed the configured value.
> This property can be used by userspace to set the bpc.
>
> V2: Initialize max_bpc to satisfy kms_properties
> V3: Move the property to drm_connector
>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Kishore Kadiyala <kishore.kadiy...@intel.com>
> Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> Cc: Manasi Navare <manasi.d.nav...@intel.com>
> Cc: Stanislav Lisovskiy <stanislav.lisovs...@intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.srip...@intel.com>
> ---
> drivers/gpu/drm/drm_atomic.c | 4 ++++
> drivers/gpu/drm/drm_atomic_helper.c | 4 ++++
> drivers/gpu/drm/i915/intel_drv.h | 2 ++
> drivers/gpu/drm/i915/intel_hdmi.c | 11 +++++++++++
> drivers/gpu/drm/i915/intel_modes.c | 20 ++++++++++++++++++++
Pls move all the i915 stuff to the second patch.
> include/drm/drm_connector.h | 6 ++++++
> include/drm/drm_mode_config.h | 5 +++++
> 7 files changed, 52 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 3eb061e11e2e..461dde0c2c10 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1416,6 +1416,8 @@ static int drm_atomic_connector_set_property(struct
> drm_connector *connector,
>
> return set_out_fence_for_connector(state->state, connector,
> fence_ptr);
> + } else if (property == config->max_bpc_property) {
> + state->max_bpc = val;
> } else if (connector->funcs->atomic_set_property) {
> return connector->funcs->atomic_set_property(connector,
> state, property, val);
> @@ -1511,6 +1513,8 @@ drm_atomic_connector_get_property(struct drm_connector
> *connector,
> *val = 0;
> } else if (property == config->writeback_out_fence_ptr_property) {
> *val = 0;
> + } else if (property == config->max_bpc_property) {
> + *val = state->max_bpc;
> } else if (connector->funcs->atomic_get_property) {
> return connector->funcs->atomic_get_property(connector,
> state, property, val);
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
> b/drivers/gpu/drm/drm_atomic_helper.c
> index 38ce9a375ffb..82caac8d1432 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -638,6 +638,10 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
> if (old_connector_state->link_status !=
> new_connector_state->link_status)
> new_crtc_state->connectors_changed = true;
> +
> + if (old_connector_state->max_bpc !=
> + new_connector_state->max_bpc)
> + new_crtc_state->connectors_changed = true;
> }
>
> if (funcs->atomic_check)
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index 1b78de838c18..209eb1798238 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1862,6 +1862,8 @@ int intel_ddc_get_modes(struct drm_connector *c, struct
> i2c_adapter *adapter);
> void intel_attach_force_audio_property(struct drm_connector *connector);
> void intel_attach_broadcast_rgb_property(struct drm_connector *connector);
> void intel_attach_aspect_ratio_property(struct drm_connector *connector);
> +void intel_attach_max_bpc_property(struct drm_connector *connector, int min,
> int
> + max);
>
>
> /* intel_overlay.c */
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
> b/drivers/gpu/drm/i915/intel_hdmi.c
> index a1799b5c12bb..82739f342246 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -2097,11 +2097,22 @@ static const struct drm_encoder_funcs
> intel_hdmi_enc_funcs = {
> static void
> intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct
> drm_connector *connector)
> {
> + struct drm_i915_private *dev_priv = to_i915(connector->dev);
> +
> intel_attach_force_audio_property(connector);
> intel_attach_broadcast_rgb_property(connector);
> intel_attach_aspect_ratio_property(connector);
> drm_connector_attach_content_type_property(connector);
> connector->state->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
> +
> + if (IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
> + IS_CHERRYVIEW(dev_priv)) {
> + intel_attach_max_bpc_property(connector, 8, 10);
> + connector->state->max_bpc = 10;
These platforms don't support HDMI deep color. The 10bpc stuff in
PIPECONF is for DP. Incidentally DP support seems to be missing from
this series.
> + } else if (INTEL_GEN(dev_priv) >= 5) {
> + intel_attach_max_bpc_property(connector, 8, 12);
> + connector->state->max_bpc = 12;
> + }
> }
>
> /*
> diff --git a/drivers/gpu/drm/i915/intel_modes.c
> b/drivers/gpu/drm/i915/intel_modes.c
> index ca44bf368e24..78f2ce92f194 100644
> --- a/drivers/gpu/drm/i915/intel_modes.c
> +++ b/drivers/gpu/drm/i915/intel_modes.c
> @@ -133,3 +133,23 @@ intel_attach_aspect_ratio_property(struct drm_connector
> *connector)
> connector->dev->mode_config.aspect_ratio_property,
> DRM_MODE_PICTURE_ASPECT_NONE);
> }
> +
> +void
> +intel_attach_max_bpc_property(struct drm_connector *connector, int min, int
> + max)
> +{
> + struct drm_device *dev = connector->dev;
> + struct drm_mode_config *config = &dev->mode_config;
> + struct drm_property *prop;
> +
> + prop = config->max_bpc_property;
> + if (prop == NULL) {
> + prop = drm_property_create_range(dev, 0, "max bpc", min, max);
> + if (prop == NULL)
> + return;
> +
> + config->max_bpc_property = prop;
> + }
> +
> + drm_object_attach_property(&connector->base, prop, max);
Might make sense to do 'connector->state->max_bpc = max' here.
Avoids having to sprinkle it in every driver.
> +}
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 97ea41dc678f..d59b9e34ae80 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -460,6 +460,12 @@ struct drm_connector_state {
> * drm_writeback_signal_completion()
> */
> struct drm_writeback_job *writeback_job;
> +
> + /**
> + * @max_bpc: Connector property to limit the maximum bit depth of
> + * the pixels being scanned out.
The comment is misleading. It makes me think this has something to do
with the pixels we scan out from a framebuffer.
> + */
> + unsigned int max_bpc;
> };
>
> /**
> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> index a0b202e1d69a..b9cd7a73b244 100644
> --- a/include/drm/drm_mode_config.h
> +++ b/include/drm/drm_mode_config.h
> @@ -562,6 +562,11 @@ struct drm_mode_config {
> */
> struct drm_property *link_status_property;
> /**
> + * @max_bpc_property: Default connector property for the max bpc to be
> + * driven out of the connector.
> + */
> + struct drm_property *max_bpc_property;
> + /**
> * @plane_type_property: Default plane property to differentiate
> * CURSOR, PRIMARY and OVERLAY legacy uses of planes.
> */
> --
> 2.9.3
--
Ville Syrjälä
Intel
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