On Fri, 27 May 2022, Ville Syrjala <ville.syrj...@linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrj...@linux.intel.com>
>
> VBT seems to have an extra flag for VRR vs. not. Let's consult
> that for eDP panels.
>
> Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_bios.c | 5 +++++
> .../drm/i915/display/intel_display_types.h | 2 ++
> drivers/gpu/drm/i915/display/intel_vrr.c | 22 ++++++++++++++-----
> 3 files changed, 23 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_bios.c
> b/drivers/gpu/drm/i915/display/intel_bios.c
> index 337277ae3dae..0774238e429b 100644
> --- a/drivers/gpu/drm/i915/display/intel_bios.c
> +++ b/drivers/gpu/drm/i915/display/intel_bios.c
> @@ -1293,6 +1293,8 @@ parse_power_conservation_features(struct
> drm_i915_private *i915,
> const struct bdb_lfp_power *power;
> u8 panel_type = panel->vbt.panel_type;
>
> + panel->vbt.vrr = true; /* matches Windows behaviour */
> +
> if (i915->vbt.version < 228)
> return;
>
> @@ -1313,6 +1315,9 @@ parse_power_conservation_features(struct
> drm_i915_private *i915,
>
> if (i915->vbt.version >= 232)
> panel->vbt.edp.hobl = power->hobl & BIT(panel_type);
> +
> + if (i915->vbt.version >= 233)
> + panel->vbt.vrr = power->vrr_feature_enabled & BIT(panel_type);
> }
>
> static void
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index a27d66fd4383..7a76ba1a3b47 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -294,6 +294,8 @@ struct intel_vbt_panel_data {
> unsigned int lvds_dither:1;
> unsigned int bios_lvds_val; /* initial [PCH_]LVDS reg val in VBIOS */
>
> + bool vrr;
> +
> u8 seamless_drrs_min_refresh_rate;
> enum drrs_type drrs_type;
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c
> b/drivers/gpu/drm/i915/display/intel_vrr.c
> index 081e52dd6c4e..04250a0fec3c 100644
> --- a/drivers/gpu/drm/i915/display/intel_vrr.c
> +++ b/drivers/gpu/drm/i915/display/intel_vrr.c
> @@ -15,19 +15,29 @@ bool intel_vrr_is_capable(struct intel_connector
> *connector)
> struct drm_i915_private *i915 = to_i915(connector->base.dev);
> struct intel_dp *intel_dp;
>
> - if (connector->base.connector_type != DRM_MODE_CONNECTOR_eDP &&
> - connector->base.connector_type != DRM_MODE_CONNECTOR_DisplayPort)
> - return false;
> -
> - intel_dp = intel_attached_dp(connector);
> /*
> * DP Sink is capable of VRR video timings if
> * Ignore MSA bit is set in DPCD.
> * EDID monitor range also should be atleast 10 for reasonable
> * Adaptive Sync or Variable Refresh Rate end user experience.
> */
> + switch (connector->base.connector_type) {
> + case DRM_MODE_CONNECTOR_eDP:
> + if (!connector->panel.vbt.vrr)
> + return false;
> + fallthrough;
> + case DRM_MODE_CONNECTOR_DisplayPort:
> + intel_dp = intel_attached_dp(connector);
> +
> + if
> (!drm_dp_sink_can_do_video_without_timing_msa(intel_dp->dpcd))
> + return false;
> +
> + break;
> + default:
> + return false;
> + }
> +
> return HAS_VRR(i915) &&
Feels like !HAS_VRR() should be an early return at the top. But that's
not part of this patch.
Reviewed-by: Jani Nikula <jani.nik...@intel.com>
> - drm_dp_sink_can_do_video_without_timing_msa(intel_dp->dpcd) &&
> info->monitor_range.max_vfreq - info->monitor_range.min_vfreq >
> 10;
> }
--
Jani Nikula, Intel Open Source Graphics Center
