[PATCH 2/3] drm/i915/dp: Require a valid atomic state for SST link training

[Kandpal, Suraj]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Imre
> Deak
> Sent: Friday, July 12, 2024 7:27 PM
> To: intel-gfx at lists.freedesktop.org
> Subject: [PATCH 2/3] drm/i915/dp: Require a valid atomic state for SST link
> training
> 
> After the previous patch link training happens always with a valid atomic
> state, so remove the NOTE comments and asserts which required a valid
> state only for DP-MST and allowed for a NULL state for DP-SST.
> 
> Signed-off-by: Imre Deak <imre.deak at intel.com>

LGTM, 
Reviewed-by: Suraj Kandpal <suraj.kandpal at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c            |  5 -----
>  .../gpu/drm/i915/display/intel_dp_link_training.c  | 14 --------------
>  2 files changed, 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index f83128ac60756..0365fb1e77eae 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -2866,7 +2866,6 @@ static void
> intel_dp_queue_modeset_retry_work(struct intel_connector *connector)
>  		drm_connector_put(&connector->base);
>  }
> 
> -/* NOTE: @state is only valid for MST links and can be %NULL for SST. */
> void  intel_dp_queue_modeset_retry_for_link(struct intel_atomic_state
> *state,
>  				      struct intel_encoder *encoder, @@ -
> 2875,7 +2874,6 @@ intel_dp_queue_modeset_retry_for_link(struct
> intel_atomic_state *state,
>  	struct intel_connector *connector;
>  	struct intel_digital_connector_state *conn_state;
>  	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> -	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
>  	int i;
> 
>  	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST)) { @@ -
> 2884,9 +2882,6 @@ intel_dp_queue_modeset_retry_for_link(struct
> intel_atomic_state *state,
>  		return;
>  	}
> 
> -	if (drm_WARN_ON(&i915->drm, !state))
> -		return;
> -
>  	for_each_new_intel_connector_in_state(state, connector,
> conn_state, i) {
>  		if (!conn_state->base.crtc)
>  			continue;
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> index af0b71bdf1fcf..58dea87a9fa28 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> @@ -1234,12 +1234,10 @@ static int
> intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
>  	return 0;
>  }
> 
> -/* NOTE: @state is only valid for MST links and can be %NULL for SST. */
> static bool intel_dp_schedule_fallback_link_training(struct
> intel_atomic_state *state,
>  						     struct intel_dp *intel_dp,
>  						     const struct
> intel_crtc_state *crtc_state)  {
> -	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
>  	struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
> 
>  	if (!intel_digital_port_connected(&dp_to_dig_port(intel_dp)->base))
> { @@ -1255,11 +1253,6 @@ static bool
> intel_dp_schedule_fallback_link_training(struct intel_atomic_state *
>  		return false;
>  	}
> 
> -	if (drm_WARN_ON(&i915->drm,
> -			intel_crtc_has_type(crtc_state,
> INTEL_OUTPUT_DP_MST) &&
> -			!state))
> -		return false;
> -
>  	/* Schedule a Hotplug Uevent to userspace to start modeset */
>  	intel_dp_queue_modeset_retry_for_link(state, encoder, crtc_state);
> 
> @@ -1518,8 +1511,6 @@ intel_dp_128b132b_link_train(struct intel_dp
> *intel_dp,
>   * retraining with reduced link rate/lane parameters if the link training
>   * fails.
>   * After calling this function intel_dp_stop_link_train() must be called.
> - *
> - * NOTE: @state is only valid for MST links and can be %NULL for SST.
>   */
>  void intel_dp_start_link_train(struct intel_atomic_state *state,
>  			       struct intel_dp *intel_dp,
> @@ -1536,11 +1527,6 @@ void intel_dp_start_link_train(struct
> intel_atomic_state *state,
>  	 */
>  	int lttpr_count = intel_dp_init_lttpr_and_dprx_caps(intel_dp);
> 
> -	if (drm_WARN_ON(&i915->drm,
> -			intel_crtc_has_type(crtc_state,
> INTEL_OUTPUT_DP_MST) &&
> -			!state))
> -		return;
> -
>  	if (lttpr_count < 0)
>  		/* Still continue with enabling the port and link training. */
>  		lttpr_count = 0;
> --
> 2.44.2