drm/dp_dual_mode: Pass drm_device to drm_dp_dual_mode_detect()

Since we're about to be using drm_dbg_*() throughout the DP helpers, we'll
need to be able to access the DRM device in the dual mode DP helpers as
well. Note however that since drm_dp_dual_mode_detect() can be called with
DDC adapters that aren't part of a drm_dp_aux struct, we need to pass down
the drm_device to these functions instead of using drm_dp_aux.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210423184309.207645-9-lyude@redhat.com
Reviewed-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_dp_dual_mode_helper.c

@@ -165,6 +165,7 @@ static bool is_lspcon_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN],
 
 /**
  * drm_dp_dual_mode_detect - Identify the DP dual mode adaptor
+ * @dev: &drm_device to use
  * @adapter: I2C adapter for the DDC bus
  *
  * Attempt to identify the type of the DP dual mode adaptor used.
@@ -178,7 +179,8 @@ static bool is_lspcon_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN],
  * Returns:
  * The type of the DP dual mode adaptor used
  */
-enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter)
+enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(const struct drm_device *dev,
+						   struct i2c_adapter *adapter)
 {
 	char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN] = {};
 	uint8_t adaptor_id = 0x00;

drivers/gpu/drm/i915/display/intel_hdmi.c

@@ -2223,7 +2223,7 @@ intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
 	enum port port = hdmi_to_dig_port(hdmi)->base.port;
 	struct i2c_adapter *adapter =
 		intel_gmbus_get_adapter(dev_priv, hdmi->ddc_bus);
-	enum drm_dp_dual_mode_type type = drm_dp_dual_mode_detect(adapter);
+	enum drm_dp_dual_mode_type type = drm_dp_dual_mode_detect(&dev_priv->drm, adapter);
 
 	/*
 	 * Type 1 DVI adaptors are not required to implement any

drivers/gpu/drm/i915/display/intel_lspcon.c

@@ -221,7 +221,8 @@ static bool lspcon_probe(struct intel_lspcon *lspcon)
 {
 	int retry;
 	enum drm_dp_dual_mode_type adaptor_type;
-	struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
+	struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
+	struct i2c_adapter *adapter = &intel_dp->aux.ddc;
 	enum drm_lspcon_mode expected_mode;
 
 	expected_mode = lspcon_wake_native_aux_ch(lspcon) ?
@@ -232,7 +233,7 @@ static bool lspcon_probe(struct intel_lspcon *lspcon)
 		if (retry)
 			usleep_range(500, 1000);
 
-		adaptor_type = drm_dp_dual_mode_detect(adapter);
+		adaptor_type = drm_dp_dual_mode_detect(intel_dp->aux.drm_dev, adapter);
 		if (adaptor_type == DRM_DP_DUAL_MODE_LSPCON)
 			break;
 	}

include/drm/drm_dp_dual_mode_helper.h

@@ -62,6 +62,7 @@
 #define DP_DUAL_MODE_LSPCON_CURRENT_MODE		0x41
 #define  DP_DUAL_MODE_LSPCON_MODE_PCON			0x1
 
+struct drm_device;
 struct i2c_adapter;
 
 ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
@@ -103,7 +104,8 @@ enum drm_dp_dual_mode_type {
 	DRM_DP_DUAL_MODE_LSPCON,
 };
 
-enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter);
+enum drm_dp_dual_mode_type
+drm_dp_dual_mode_detect(const struct drm_device *dev, struct i2c_adapter *adapter);
 int drm_dp_dual_mode_max_tmds_clock(enum drm_dp_dual_mode_type type,
 				    struct i2c_adapter *adapter);
 int drm_dp_dual_mode_get_tmds_output(enum drm_dp_dual_mode_type type,