[PATCH v2 1/6] drm/i915/dp: Reset intel_dp->link_trained before retraining the link

[Nautiyal, Ankit K]

On 7/9/2024 12:30 AM, Imre Deak wrote:
> Regularly retraining a link during an atomic commit happens with the
> given pipe/link already disabled and hence intel_dp->link_trained being
> false. Ensure this also for retraining a DP SST link via direct calls to
> the link training functions (vs. an actual commit as for DP MST). So far
> nothing depended on this, however the next patch will depend on
> link_trained==false for changing the LTTPR mode to non-transparent.
>
> Cc: <stable at vger.kernel.org> # v5.15+
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>

LGTM.

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>

> ---
>   drivers/gpu/drm/i915/display/intel_dp.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 3903f6ead6e66..59f11af3b0a1d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -5314,6 +5314,8 @@ static int intel_dp_retrain_link(struct intel_encoder *encoder,
>   		const struct intel_crtc_state *crtc_state =
>   			to_intel_crtc_state(crtc->base.state);
>   
> +		intel_dp->link_trained = false;
> +
>   		intel_dp_check_frl_training(intel_dp);
>   		intel_dp_pcon_dsc_configure(intel_dp, crtc_state);
>   		intel_dp_start_link_train(NULL, intel_dp, crtc_state);