[Intel-gfx] [PATCH 03/15] drm/i915: Store max lane count in intel_digital_port

[ville.syrjala at linux.intel.com]

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

Rather than having open coded checks for the DDI A/E configuration,
just store the max supported lane count in intel_digital_port.

We had an open coded check for DDI A, but not for DDI E. So we may
have been vilating the DDI E max lane count.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c  | 10 +---------
 drivers/gpu/drm/i915/intel_dp.c   | 13 +++++++------
 drivers/gpu/drm/i915/intel_drv.h  |  1 +
 drivers/gpu/drm/i915/intel_hdmi.c |  6 ++++++
 4 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index e903d9c87680..fdb4aaa084d6 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -3315,15 +3315,6 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
 		return;
 	}
 
-	if (WARN(max_lanes == 0,
-		 "No lanes for port %c\n", port_name(port)))
-		return;
-
-	if (WARN(init_hdmi && max_lanes < 4,
-		 "Not enough lanes (%d) for HDMI on port %c\n",
-		 max_lanes, port_name(port)))
-		init_hdmi = false;
-
 	intel_dig_port = kzalloc(sizeof(*intel_dig_port), GFP_KERNEL);
 	if (!intel_dig_port)
 		return;
@@ -3346,6 +3337,7 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
 	intel_dig_port->saved_port_bits = I915_READ(DDI_BUF_CTL(port)) &
 					  (DDI_BUF_PORT_REVERSAL |
 					   DDI_A_4_LANES);
+	intel_dig_port->max_lanes = max_lanes;
 
 	/*
 	 * Bspec says that DDI_A_4_LANES is the only supported configuration
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f335c92b4fa7..7d354b1e5e5f 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -157,14 +157,9 @@ intel_dp_max_link_bw(struct intel_dp  *intel_dp)
 static u8 intel_dp_max_lane_count(struct intel_dp *intel_dp)
 {
 	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
-	struct drm_device *dev = intel_dig_port->base.base.dev;
 	u8 source_max, sink_max;
 
-	source_max = 4;
-	if (HAS_DDI(dev) && intel_dig_port->port == PORT_A &&
-	    (intel_dig_port->saved_port_bits & DDI_A_4_LANES) == 0)
-		source_max = 2;
-
+	source_max = intel_dig_port->max_lanes;
 	sink_max = drm_dp_max_lane_count(intel_dp->dpcd);
 
 	return min(source_max, sink_max);
@@ -5820,6 +5815,11 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 	enum port port = intel_dig_port->port;
 	int type, ret;
 
+	if (WARN(intel_dig_port->max_lanes < 1,
+		 "Not enough lanes (%d) for DP on port %c\n",
+		 intel_dig_port->max_lanes, port_name(port)))
+		return false;
+
 	intel_dp->pps_pipe = INVALID_PIPE;
 
 	/* intel_dp vfuncs */
@@ -6016,6 +6016,7 @@ intel_dp_init(struct drm_device *dev,
 
 	intel_dig_port->port = port;
 	intel_dig_port->dp.output_reg = output_reg;
+	intel_dig_port->max_lanes = 4;
 
 	intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
 	if (IS_CHERRYVIEW(dev)) {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 8963a8a53b0b..43d451c7c366 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -818,6 +818,7 @@ struct intel_digital_port {
 	struct intel_hdmi hdmi;
 	enum irqreturn (*hpd_pulse)(struct intel_digital_port *, bool);
 	bool release_cl2_override;
+	uint8_t max_lanes;
 };
 
 struct intel_dp_mst_encoder {
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index c3978bad5ca0..895189abfd56 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -2034,6 +2034,11 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 	enum port port = intel_dig_port->port;
 	uint8_t alternate_ddc_pin;
 
+	if (WARN(intel_dig_port->max_lanes < 4,
+		 "Not enough lanes (%d) for HDMI on port %c\n",
+		 intel_dig_port->max_lanes, port_name(port)))
+		return;
+
 	drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
 			   DRM_MODE_CONNECTOR_HDMIA);
 	drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
@@ -2217,6 +2222,7 @@ void intel_hdmi_init(struct drm_device *dev,
 	intel_dig_port->port = port;
 	intel_dig_port->hdmi.hdmi_reg = hdmi_reg;
 	intel_dig_port->dp.output_reg = INVALID_MMIO_REG;
+	intel_dig_port->max_lanes = 4;
 
 	intel_hdmi_init_connector(intel_dig_port, intel_connector);
 }
-- 
2.4.10