Re: [PATCH v2 17/23] drm/i915/dp: Enable/Disable DSC in DP Sink

["Srivatsa, Anusha" <anusha.srivatsa@intel.com>]

>-----Original Message-----
>From: Navare, Manasi D
>Sent: Tuesday, July 31, 2018 2:07 PM
>To: intel-gfx@lists.freedesktop.org
>Cc: Singh, Gaurav K <gaurav.k.singh@intel.com>; Jani Nikula
><jani.nikula@linux.intel.com>; Ville Syrjala <ville.syrjala@linux.intel.com>;
>Srivatsa, Anusha <anusha.srivatsa@intel.com>; Navare, Manasi D
><manasi.d.navare@intel.com>
>Subject: [PATCH v2 17/23] drm/i915/dp: Enable/Disable DSC in DP Sink
>
>From: Gaurav K Singh <gaurav.k.singh@intel.com>
>
>This patch enables decompression support in sink device before link training and
>disables the same during the DDI disabling.
>
>v2:(From Manasi)
>* Change the enable/disable function to take crtc_state instead of intel_dp as an
>argument (Manasi)
>* Use the compression_enable flag as part of crtc_state (Manasi)
>
>Cc: Jani Nikula <jani.nikula@linux.intel.com>
>Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
>Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
>Cc: Gaurav K Singh <gaurav.k.singh@intel.com>
>Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
>Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>

Looks good. Setting the state at the right time.
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>

>---
> drivers/gpu/drm/i915/intel_ddi.c |  5 +++++  drivers/gpu/drm/i915/intel_dp.c  |
>15 +++++++++++++++  drivers/gpu/drm/i915/intel_drv.h |  3 +++
> 3 files changed, 23 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
>index 0adc043..5e8c891 100644
>--- a/drivers/gpu/drm/i915/intel_ddi.c
>+++ b/drivers/gpu/drm/i915/intel_ddi.c
>@@ -2825,6 +2825,8 @@ static void intel_ddi_pre_enable_dp(struct
>intel_encoder *encoder,
> 	intel_ddi_init_dp_buf_reg(encoder);
> 	if (!is_mst)
> 		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_start_link_train(intel_dp);
> 	if (port != PORT_A || INTEL_GEN(dev_priv) >= 9)
> 		intel_dp_stop_link_train(intel_dp);
>@@ -3154,6 +3156,9 @@ static void intel_disable_ddi_dp(struct intel_encoder
>*encoder,
> 	intel_edp_drrs_disable(intel_dp, old_crtc_state);
> 	intel_psr_disable(intel_dp, old_crtc_state);
> 	intel_edp_backlight_off(old_conn_state);
>+	/* Disable the decompression in DP Sink */
>+	intel_dp_sink_set_decompression_state(intel_dp, old_crtc_state,
>+					      ~DP_DECOMPRESSION_EN);
> }
>
> static void intel_disable_ddi_hdmi(struct intel_encoder *encoder, diff --git
>a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index
>dc0a3c2..1a8329c 100644
>--- a/drivers/gpu/drm/i915/intel_dp.c
>+++ b/drivers/gpu/drm/i915/intel_dp.c
>@@ -2925,6 +2925,21 @@ static bool downstream_hpd_needs_d0(struct
>intel_dp *intel_dp)
> 		intel_dp->downstream_ports[0] & DP_DS_PORT_HPD;  }
>
>+void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
>+					   const struct intel_crtc_state
>*crtc_state,
>+					   int state)
>+{
>+	int ret;
>+
>+	if (!crtc_state->dsc_params.compression_enable)
>+		return;
>+
>+	ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_DSC_ENABLE, state);
>+	if (ret < 0)
>+		DRM_DEBUG_KMS("Failed to %s sink decompression state\n",
>+			      state == DP_DECOMPRESSION_EN ? "enable" :
>"disable"); }
>+
> /* 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 33cc777..ced62e0 100644
>--- a/drivers/gpu/drm/i915/intel_drv.h
>+++ b/drivers/gpu/drm/i915/intel_drv.h
>@@ -1691,6 +1691,9 @@ void intel_dp_stop_link_train(struct intel_dp
>*intel_dp);  int intel_dp_retrain_link(struct intel_encoder *encoder,
> 			  struct drm_modeset_acquire_ctx *ctx);  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_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);
>--
>2.7.4

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