[PATCH] drm/i915/lspcon: Fix Parade LSPCON scrambling fail

* [PATCH] drm/i915/lspcon: Fix Parade LSPCON scrambling fail
@ 2018-10-12 18:38 Ville Syrjala
  2018-10-12 18:47 ` ✗ Fi.CI.BAT: failure for " Patchwork
                   ` (5 more replies)
  0 siblings, 6 replies; 12+ messages in thread
From: Ville Syrjala @ 2018-10-12 18:38 UTC (permalink / raw)
  To: intel-gfx

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

The Parade LSPCON on KBL NUCs forgets to turn off scrambling/bit clock
rate when switching from a mode that needs them to a mode that does
not. This manifests as a "no signal" on my TV when I try to go from
4k to 1080p for example. Resetting the SCDC register bits with
i2cset is sufficient to restore the picture to the screen.

Here's the OUI/fw revision for the LSPCON chip in question:
DP branch: OUI 00-1c-f8 dev-ID 175IB0 HW-rev 1.0 SW-rev 7.32 quirks 0x0000

Asking users to poke at SCDC with i2cset is a bit much, so
let's work around this in the driver. We don't need to go all
out here and compute whether scrambling is needed or not as
LSPCON will do that itself. If scrambling is actually
required LSPCON does not forget to enable it.

Cc: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c  | 52 ++++++++++++++++++++++++++++---
 drivers/gpu/drm/i915/intel_drv.h  |  1 +
 drivers/gpu/drm/i915/intel_hdmi.c |  5 ++-
 3 files changed, 51 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 47960c92cbbf..ef502fc9add1 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2984,6 +2984,23 @@ static void intel_ddi_pre_enable(struct intel_encoder *encoder,
 		intel_ddi_pre_enable_dp(encoder, crtc_state, conn_state);
 }
 
+static void intel_ddi_pre_enable_lspcon(struct intel_encoder *encoder,
+					const struct intel_crtc_state *crtc_state,
+					const struct drm_connector_state *conn_state)
+{
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+
+	intel_ddi_pre_enable(encoder, crtc_state, conn_state);
+
+	/*
+	 * Parade LSPCON forgets to turn off scrambling/bit clock rate
+	 * when switching from a mode that needs them to a mode that
+	 * does not.
+	 */
+	intel_hdmi_handle_sink_scrambling(encoder, conn_state->connector,
+					  &intel_dp->aux.ddc, false, false);
+}
+
 static void intel_disable_ddi_buf(struct intel_encoder *encoder)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -3086,6 +3103,23 @@ static void intel_ddi_post_disable(struct intel_encoder *encoder,
 					  old_crtc_state, old_conn_state);
 }
 
+static void intel_ddi_post_disable_lspcon(struct intel_encoder *encoder,
+					  const struct intel_crtc_state *old_crtc_state,
+					  const struct drm_connector_state *old_conn_state)
+{
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+
+	/*
+	 * Parade LSPCON forgets to turn off scrambling/bit clock rate
+	 * when switching from a mode that needs them to a mode that
+	 * does not.
+	 */
+	intel_hdmi_handle_sink_scrambling(encoder, old_conn_state->connector,
+					  &intel_dp->aux.ddc, false, false);
+
+	intel_ddi_post_disable(encoder, old_crtc_state, old_conn_state);
+}
+
 void intel_ddi_fdi_post_disable(struct intel_encoder *encoder,
 				const struct intel_crtc_state *old_crtc_state,
 				const struct drm_connector_state *old_conn_state)
@@ -3146,9 +3180,11 @@ static void intel_enable_ddi_hdmi(struct intel_encoder *encoder,
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
 	struct drm_connector *connector = conn_state->connector;
+	struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv,
+							      dig_port->hdmi.ddc_bus);
 	enum port port = encoder->port;
 
-	if (!intel_hdmi_handle_sink_scrambling(encoder, connector,
+	if (!intel_hdmi_handle_sink_scrambling(encoder, connector, adapter,
 					       crtc_state->hdmi_high_tmds_clock_ratio,
 					       crtc_state->hdmi_scrambling))
 		DRM_ERROR("[CONNECTOR:%d:%s] Failed to configure sink scrambling/TMDS bit clock ratio\n",
@@ -3243,13 +3279,17 @@ static void intel_disable_ddi_hdmi(struct intel_encoder *encoder,
 				   const struct intel_crtc_state *old_crtc_state,
 				   const struct drm_connector_state *old_conn_state)
 {
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct drm_connector *connector = old_conn_state->connector;
+	struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
+	struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv,
+							      dig_port->hdmi.ddc_bus);
 
 	if (old_crtc_state->has_audio)
 		intel_audio_codec_disable(encoder,
 					  old_crtc_state, old_conn_state);
 
-	if (!intel_hdmi_handle_sink_scrambling(encoder, connector,
+	if (!intel_hdmi_handle_sink_scrambling(encoder, connector, adapter,
 					       false, false))
 		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] Failed to reset sink scrambling/TMDS bit clock ratio\n",
 			      connector->base.id, connector->name);
@@ -3862,17 +3902,21 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 	}
 
 	if (init_lspcon) {
-		if (lspcon_init(intel_dig_port))
+		if (lspcon_init(intel_dig_port)) {
 			/* TODO: handle hdmi info frame part */
 			DRM_DEBUG_KMS("LSPCON init success on port %c\n",
 				port_name(port));
-		else
+
+			intel_encoder->pre_enable = intel_ddi_pre_enable_lspcon;
+			intel_encoder->post_disable = intel_ddi_post_disable_lspcon;
+		} else {
 			/*
 			 * LSPCON init faied, but DP init was success, so
 			 * lets try to drive as DP++ port.
 			 */
 			DRM_ERROR("LSPCON init failed on port %c\n",
 				port_name(port));
+		}
 	}
 
 	return;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e321fc698ae1..d0a06fcc80c0 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1866,6 +1866,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
 			       struct drm_connector_state *conn_state);
 bool intel_hdmi_handle_sink_scrambling(struct intel_encoder *encoder,
 				       struct drm_connector *connector,
+				       struct i2c_adapter *adapter,
 				       bool high_tmds_clock_ratio,
 				       bool scrambling);
 void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 2c53efc463e6..bf6f571b674b 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -2114,6 +2114,7 @@ intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct drm_connector *c
  * intel_hdmi_handle_sink_scrambling: handle sink scrambling/clock ratio setup
  * @encoder: intel_encoder
  * @connector: drm_connector
+ * @adapter: i2c adapter for the ddc bus
  * @high_tmds_clock_ratio = bool to indicate if the function needs to set
  *  or reset the high tmds clock ratio for scrambling
  * @scrambling: bool to Indicate if the function needs to set or reset
@@ -2130,15 +2131,13 @@ intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct drm_connector *c
  */
 bool intel_hdmi_handle_sink_scrambling(struct intel_encoder *encoder,
 				       struct drm_connector *connector,
+				       struct i2c_adapter *adapter,
 				       bool high_tmds_clock_ratio,
 				       bool scrambling)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
-	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
 	struct drm_scrambling *sink_scrambling =
 		&connector->display_info.hdmi.scdc.scrambling;
-	struct i2c_adapter *adapter =
-		intel_gmbus_get_adapter(dev_priv, intel_hdmi->ddc_bus);
 
 	if (!sink_scrambling->supported)
 		return true;
-- 
2.18.1

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