[Intel-gfx] [v4 5/7] drm/i915/fec: Set FEC_READY in FEC_CONFIGURATION

[Srivatsa, Anusha]

>-----Original Message-----
>From: Srivatsa, Anusha
>Sent: Tuesday, October 30, 2018 5:45 PM
>To: intel-gfx at lists.freedesktop.org
>Cc: Srivatsa, Anusha <anusha.srivatsa at intel.com>; Singh, Gaurav K
><gaurav.k.singh at intel.com>; Jani Nikula <jani.nikula at linux.intel.com>; Ville
>Syrjala <ville.syrjala at linux.intel.com>; Navare, Manasi D
><manasi.d.navare at intel.com>
>Subject: [v4 5/7] drm/i915/fec: Set FEC_READY in FEC_CONFIGURATION
>
>If the panel supports FEC, the driver has to set the FEC_READY bit in the dpcd
>register:
>FEC_CONFIGURATION.
>
>This has to happen before link training.
>
>v2: s/intel_dp_set_fec_ready/intel_dp_sink_set_fec_ready
>   - change commit message. (Gaurav)
>
>v3: rebased. (r-b Manasi)
>
>v4: Use fec crtc state, before setting FEC_READY bit. (Anusha)
>
>Cc: Gaurav K Singh <gaurav.k.singh at intel.com>
>Cc: Jani Nikula <jani.nikula at linux.intel.com>
>Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
>Cc: Manasi Navare <manasi.d.navare at intel.com>
>Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
>---
> drivers/gpu/drm/i915/intel_ddi.c |  1 +  drivers/gpu/drm/i915/intel_dp.c  | 18
>++++++++++++++++++  drivers/gpu/drm/i915/intel_drv.h |  3 +++
> 3 files changed, 22 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
>index 1de0a3917d7f..efbada95dc4e 100644
>--- a/drivers/gpu/drm/i915/intel_ddi.c
>+++ b/drivers/gpu/drm/i915/intel_ddi.c
>@@ -2932,6 +2932,7 @@ static void intel_ddi_pre_enable_dp(struct
>intel_encoder *encoder,
> 		intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
> 	intel_dp_sink_set_decompression_state(intel_dp, crtc_state,
> 					      DP_DECOMPRESSION_EN);
>+	intel_dp_sink_set_fec_ready(intel_dp, crtc_state, DP_FEC_READY);
> 	intel_dp_start_link_train(intel_dp);
> 	if (port != PORT_A || INTEL_GEN(dev_priv) >= 9)
> 		intel_dp_stop_link_train(intel_dp);
>diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
>index 5ae3855925f3..a750415d1ec0 100644
>--- a/drivers/gpu/drm/i915/intel_dp.c
>+++ b/drivers/gpu/drm/i915/intel_dp.c
>@@ -3058,6 +3058,24 @@ void intel_dp_sink_set_decompression_state(struct
>intel_dp *intel_dp,
> 			      state == DP_DECOMPRESSION_EN ? "enable" :
>"disable");  }
>
>+void intel_dp_sink_set_fec_ready(struct intel_dp *intel_dp,
>+				 const struct intel_crtc_state *crtc_state,
>+				 int state)

Manasi, Ville, 
Since enable_fec and disable_fec (next two patches in the series) are being moved to intel_ddi.c, this function might also be moved to intel_ddi.c?

Anusha 
>+{
>+	int ret;
>+
>+	if (!crtc_state->fec_enable)
>+		return;
>+
>+	/* If compression is not enabled, do not set FEC bits */
>+	if (!crtc_state->dsc_params.compression_enable)
>+		return;
>+
>+	ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_FEC_CONFIGURATION,
>state);
>+	if (ret < 0)
>+		DRM_DEBUG_KMS("Failed to get FEC enabled in sink\n"); }
>+
> /* If the sink supports it, try to set the power state appropriately */  void
>intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)  { diff --git
>a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>index 9f701463219b..2a080205968d 100644
>--- a/drivers/gpu/drm/i915/intel_drv.h
>+++ b/drivers/gpu/drm/i915/intel_drv.h
>@@ -1796,6 +1796,9 @@ void intel_dp_sink_dpms(struct intel_dp *intel_dp, int
>mode);  void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
> 					   const struct intel_crtc_state
>*crtc_state,
> 					   int state);
>+void intel_dp_sink_set_fec_ready(struct intel_dp *intel_dp,
>+				 const struct intel_crtc_state *crtc_state,
>+				 int state);
> void intel_dp_encoder_reset(struct drm_encoder *encoder);  void
>intel_dp_encoder_suspend(struct intel_encoder *intel_encoder);  void
>intel_dp_encoder_destroy(struct drm_encoder *encoder);
>--
>2.17.1