On Thu, Nov 09, 2017 at 12:31:51AM +0000, Radhakrishna Sripada wrote:
> From: "Sripada, Radhakrishna" <radhakrishna.sripada@xxxxxxxxx>
>
> 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.
I wonder if this case qualifies to "Linux is not about choice"...
Or all test cases we already have in place would cover all possible
combinations in CI to avoid dealing with future regressions.
>
> V2: Initialize max_bpc to satisfy kms_properties
>
> Suggested-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
> Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 1 +
> drivers/gpu/drm/i915/intel_atomic.c | 7 +++++++
> drivers/gpu/drm/i915/intel_drv.h | 2 ++
> drivers/gpu/drm/i915/intel_hdmi.c | 11 +++++++++++
> drivers/gpu/drm/i915/intel_modes.c | 19 +++++++++++++++++++
> 5 files changed, 40 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index fe93115c4caa..9642bc4b7a0b 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2477,6 +2477,7 @@ struct drm_i915_private {
>
> struct drm_property *broadcast_rgb_property;
> struct drm_property *force_audio_property;
> + struct drm_property *max_bpc_property;
>
> /* hda/i915 audio component */
> struct i915_audio_component *audio_component;
> diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
> index 36d4e635e4ce..d6d836ea1a7f 100644
> --- a/drivers/gpu/drm/i915/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/intel_atomic.c
> @@ -58,6 +58,8 @@ int intel_digital_connector_atomic_get_property(struct drm_connector *connector,
> *val = intel_conn_state->force_audio;
> else if (property == dev_priv->broadcast_rgb_property)
> *val = intel_conn_state->broadcast_rgb;
> + else if (property == dev_priv->max_bpc_property)
> + *val = intel_conn_state->max_bpc;
> else {
> DRM_DEBUG_ATOMIC("Unknown property %s\n", property->name);
> return -EINVAL;
> @@ -95,6 +97,11 @@ int intel_digital_connector_atomic_set_property(struct drm_connector *connector,
> return 0;
> }
>
> + if (property == dev_priv->max_bpc_property) {
> + intel_conn_state->max_bpc = val;
> + return 0;
> + }
> +
> DRM_DEBUG_ATOMIC("Unknown property %s\n", property->name);
> return -EINVAL;
> }
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 00b488688042..9004a1ee1e99 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -340,6 +340,7 @@ struct intel_digital_connector_state {
>
> enum hdmi_force_audio force_audio;
> int broadcast_rgb;
> + int max_bpc;
> };
>
> #define to_intel_digital_connector_state(x) container_of(x, struct intel_digital_connector_state, base)
> @@ -1704,6 +1705,7 @@ 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 fa1c793a21ef..4a5dda8aa8c3 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1808,10 +1808,21 @@ 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);
> 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);
> + to_intel_digital_connector_state(connector->state)->max_bpc = 10;
> + } else if (INTEL_GEN(dev_priv) >= 5) {
> + intel_attach_max_bpc_property(connector, 8, 12);
> + to_intel_digital_connector_state(connector->state)->max_bpc = 12;
> + }
> }
>
> /*
> diff --git a/drivers/gpu/drm/i915/intel_modes.c b/drivers/gpu/drm/i915/intel_modes.c
> index 4e43f873c889..8357e494e911 100644
> --- a/drivers/gpu/drm/i915/intel_modes.c
> +++ b/drivers/gpu/drm/i915/intel_modes.c
> @@ -150,3 +150,22 @@ 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_i915_private *dev_priv = to_i915(dev);
> + struct drm_property *prop;
> +
> + prop = dev_priv->max_bpc_property;
> + if (prop == NULL) {
> + prop = drm_property_create_range(dev, 0, "max bpc", min, max);
> + if (prop == NULL)
> + return;
> +
> + dev_priv->max_bpc_property = prop;
> + }
> +
> + drm_object_attach_property(&connector->base, prop, max);
> +}
> --
> 2.9.3
>
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