radeon: don't do full edid for detection purposes

linux-core/radeon_connectors.c

@@ -163,18 +163,16 @@ static int radeon_vga_mode_valid(struct drm_connector *connector,
 
 static enum drm_connector_status radeon_vga_detect(struct drm_connector *connector)
 {
-	struct edid *edid;
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	struct drm_encoder *encoder;
 	struct drm_encoder_helper_funcs *encoder_funcs;
+	bool ret;
 
 	radeon_i2c_do_lock(radeon_connector, 1);
-	edid = drm_get_edid(&radeon_connector->base, &radeon_connector->ddc_bus->adapter);
+	ret = radeon_ddc_probe(radeon_connector);
 	radeon_i2c_do_lock(radeon_connector, 0);
-	if (edid) {
+	if (ret)
-		kfree(edid);
 		return connector_status_connected;
-	}
 
 	/* if EDID fails to a load detect */
 	encoder = radeon_best_single_encoder(connector);
@@ -200,27 +198,19 @@ struct drm_connector_funcs radeon_vga_connector_funcs = {
 
 static enum drm_connector_status radeon_dvi_detect(struct drm_connector *connector)
 {
-	struct edid *edid;
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	struct drm_encoder *encoder;
 	struct drm_encoder_helper_funcs *encoder_funcs;
 	struct drm_mode_object *obj;
 	int i;
 	enum drm_connector_status ret;
+	bool dret;
 
 	radeon_i2c_do_lock(radeon_connector, 1);
-	edid = drm_get_edid(&radeon_connector->base, &radeon_connector->ddc_bus->adapter);
+	dret = radeon_ddc_probe(radeon_connector);
 	radeon_i2c_do_lock(radeon_connector, 0);
-	if (edid) {
+	if (dret)
-		/* if the monitor is digital - set the bits */
-		if (edid->digital)
-			radeon_connector->use_digital = 1;
-		else
-			radeon_connector->use_digital = 0;
-
-		kfree(edid);
 		return connector_status_connected;
-	}
 
 	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
 		if (connector->encoder_ids[i] == 0)

linux-core/radeon_display.c

@@ -31,6 +31,7 @@
 #include <asm/div64.h>
 
 #include "drm_crtc_helper.h"
+#include "drm_edid.h"
 
 int radeon_ddc_dump(struct drm_connector *connector);
 
@@ -305,6 +306,11 @@ int radeon_ddc_get_modes(struct radeon_connector *radeon_connector)
 	edid = drm_get_edid(&radeon_connector->base, &radeon_connector->ddc_bus->adapter);
 	radeon_i2c_do_lock(radeon_connector, 0);
 	if (edid) {
+		/* update digital bits here */
+		if (edid->digital)
+			radeon_connector->use_digital = 1;
+		else
+			radeon_connector->use_digital = 0;
 		drm_mode_connector_update_edid_property(&radeon_connector->base, edid);
 		ret = drm_add_edid_modes(&radeon_connector->base, edid);
 		kfree(edid);

linux-core/radeon_i2c.c

@@ -27,6 +27,38 @@
 #include "radeon_drm.h"
 #include "radeon_drv.h"
 
+/**
+ * radeon_ddc_probe
+ *
+ */
+bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
+{
+        u8 out_buf[] = { 0x0, 0x0};
+        u8 buf[2];
+        int ret;
+        struct i2c_msg msgs[] = {
+                {
+                        .addr = 0x50,
+                        .flags = 0,
+                        .len = 1,
+                        .buf = out_buf,
+                },
+                {
+                        .addr = 0x50,
+                        .flags = I2C_M_RD,
+                        .len = 1,
+                        .buf = buf,
+                }
+        };
+
+        ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
+        if (ret == 2)
+                return true;
+
+        return false;
+}
+
+
 void radeon_i2c_do_lock(struct radeon_connector *radeon_connector, int lock_state)
 {
 	struct drm_radeon_private *dev_priv = radeon_connector->base.dev->dev_private;
@@ -161,3 +193,4 @@ struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
 {
 	return NULL;
 }
+

linux-core/radeon_mode.h

@@ -247,6 +247,7 @@ extern struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
 						 struct radeon_i2c_bus_rec *rec,
 						 const char *name);
 extern void radeon_i2c_destroy(struct radeon_i2c_chan *i2c);
+extern bool radeon_ddc_probe(struct radeon_connector *radeon_connector);
 extern int radeon_ddc_get_modes(struct radeon_connector *radeon_connector);
 extern struct drm_connector *radeon_connector_add(struct drm_device *dev, int bios_index);