On Mon, Aug 27, 2018 at 04:31:49PM +0300, Ville Syrjälä wrote:
> 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 <[email protected]>
> > Cc: Kishore Kadiyala <[email protected]>
> > Cc: Rodrigo Vivi <[email protected]>
> > Cc: Manasi Navare <[email protected]>
> > Cc: Stanislav Lisovskiy <[email protected]>
> > Signed-off-by: Radhakrishna Sripada <[email protected]>
> > ---
> > 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.
Sure will do it in the next rev.
>
> > 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.
Limiting this to 8 and removing VLV/CHV to the other case as they support deep
color.
>
> > + } 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.
Sure will make this change in the next rev.
>
> > +}
> > 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.
Will modify this comment in the next rev.
Regards,
Radhakrishna(RK) Sripada
>
> > + */
> > + 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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