On Sat, Oct 03, 2020 at 03:18:44AM +0300, Imre Deak wrote:
> Some BIOSes set an unsupported/imprecise DP link rate (for instance on
> TGL A stepping). Make sure that we do an encoder recompute and a modeset
> in this case.
>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_dp.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index d33a3d9fdc3a..df5277c2b9ba 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -3707,6 +3707,18 @@ bool intel_dp_initial_fastset_check(struct intel_encoder *encoder,
> struct intel_crtc_state *crtc_state)
> {
> struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> + struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> +
> + /*
> + * If BIOS has set an unsupported or non-standard link rate for some
> + * reason force an encoder recompute and full modeset.
> + */
> + if (intel_dp_rate_index(intel_dp->source_rates, intel_dp->num_source_rates,
> + crtc_state->port_clock) < 0) {
> + drm_dbg_kms(&i915->drm, "Forcing full modeset due to unsupported link rate\n");
> + crtc_state->uapi.connectors_changed = true;
> + return false;
> + }
>
> /*
> * FIXME hack to force full modeset when DSC is being used.
> --
> 2.25.1
--
Ville Syrjälä
Intel
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