On 2018-10-12 12:44 p.m., Nicholas Kazlauskas wrote:
> This patch introduces the 'vrr_enabled' CRTC property to allow
> dynamic control over variable refresh rate support for a CRTC.
>
> This property should be treated like a content hint to the driver -
> if the hardware or driver is not capable of driving variable refresh
> timings then this is not considered an error.
>
> Capability for variable refresh rate support should be determined
> by querying the vrr_capable drm connector property.
>
> It is worth noting that while the property is intended for atomic use
> it isn't filtered from legacy userspace queries. This allows for Xorg
> userspace drivers to implement support.
>
> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Harry
> ---
> drivers/gpu/drm/drm_atomic_uapi.c | 4 ++++
> drivers/gpu/drm/drm_crtc.c | 2 ++
> drivers/gpu/drm/drm_mode_config.c | 6 ++++++
> include/drm/drm_crtc.h | 9 +++++++++
> include/drm/drm_mode_config.h | 5 +++++
> 5 files changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
> index d5b7f315098c..eec396a57b88 100644
> --- a/drivers/gpu/drm/drm_atomic_uapi.c
> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
> @@ -433,6 +433,8 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
> ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
> drm_property_blob_put(mode);
> return ret;
> + } else if (property == config->prop_vrr_enabled) {
> + state->vrr_enabled = val;
> } else if (property == config->degamma_lut_property) {
> ret = drm_atomic_replace_property_blob_from_id(dev,
> &state->degamma_lut,
> @@ -491,6 +493,8 @@ drm_atomic_crtc_get_property(struct drm_crtc *crtc,
> *val = state->active;
> else if (property == config->prop_mode_id)
> *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
> + else if (property == config->prop_vrr_enabled)
> + *val = state->vrr_enabled;
> else if (property == config->degamma_lut_property)
> *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
> else if (property == config->ctm_property)
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 5f488aa80bcd..e4eb2c897ff4 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -340,6 +340,8 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
> drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
> drm_object_attach_property(&crtc->base,
> config->prop_out_fence_ptr, 0);
> + drm_object_attach_property(&crtc->base,
> + config->prop_vrr_enabled, 0);
> }
>
> return 0;
> diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
> index ee80788f2c40..5670c67f28d4 100644
> --- a/drivers/gpu/drm/drm_mode_config.c
> +++ b/drivers/gpu/drm/drm_mode_config.c
> @@ -310,6 +310,12 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
> return -ENOMEM;
> dev->mode_config.prop_mode_id = prop;
>
> + prop = drm_property_create_bool(dev, 0,
> + "VRR_ENABLED");
> + if (!prop)
> + return -ENOMEM;
> + dev->mode_config.prop_vrr_enabled = prop;
> +
> prop = drm_property_create(dev,
> DRM_MODE_PROP_BLOB,
> "DEGAMMA_LUT", 0);
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index b21437bc95bf..39c3900aab3c 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -290,6 +290,15 @@ struct drm_crtc_state {
> */
> u32 pageflip_flags;
>
> + /**
> + * @vrr_enabled:
> + *
> + * Indicates if variable refresh rate should be enabled for the CRTC.
> + * Support for the requested vrr state will depend on driver and
> + * hardware capabiltiy - lacking support is not treated as failure.
> + */
> + bool vrr_enabled;
> +
> /**
> * @event:
> *
> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> index 928e4172a0bb..49f2fcfdb5fc 100644
> --- a/include/drm/drm_mode_config.h
> +++ b/include/drm/drm_mode_config.h
> @@ -639,6 +639,11 @@ struct drm_mode_config {
> * connectors must be of and active must be set to disabled, too.
> */
> struct drm_property *prop_mode_id;
> + /**
> + * @prop_vrr_enabled: Default atomic CRTC property to indicate
> + * whether variable refresh rate should be enabled on the CRTC.
> + */
> + struct drm_property *prop_vrr_enabled;
>
> /**
> * @dvi_i_subconnector_property: Optional DVI-I property to
>
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