> -----Original Message-----
> From: Nautiyal, Ankit K <ankit.k.nauti...@intel.com>
> Sent: Tuesday, March 9, 2021 10:09 AM
> To: intel-gfx@lists.freedesktop.org
> Cc: dri-de...@lists.freedesktop.org; ville.syrj...@linux.intel.com; Shankar,
> Uma
> <uma.shan...@intel.com>; airl...@linux.ie; jani.nik...@linux.intel.com
> Subject: [PATCH v3 3/3] drm/i915/display: Configure HDMI2.1 Pcon for FRL only
> if
> Src-Ctl mode is available
>
> Currently we see only the MAX FRL BW from PCON before going for FRL.
> Also add the check if source control mode is supported by the PCON, before
> starting
> configuring PCON for FRL training.
>
> Signed-off-by: Ankit Nautiyal <ankit.k.nauti...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_dp.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index 2e90359ce21f..8e401d3fd29d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -2638,7 +2638,8 @@ void intel_dp_check_frl_training(struct intel_dp
> *intel_dp)
> struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
>
> /* Always go for FRL training if supported */
> - if (!intel_dp_is_hdmi_2_1_sink(intel_dp) ||
> + if (!(intel_dp->dpcd[2] & DP_PCON_SOURCE_CTL_MODE) ||
Would be good to add spec reference as well here.
With that added, this is
Reviewed-by: Uma Shankar <uma.shan...@intel.com>
> + !intel_dp_is_hdmi_2_1_sink(intel_dp) ||
> intel_dp->frl.is_trained)
> return;
>
> --
> 2.29.2
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