drm/radeon: rework panel mode setup

Adjust the panel mode setup to match the behavior
of the vbios.  Rather than checking for specific
bridge chip ids, just check the eDP configuration register.
This saves extra aux transactions and works across
DP bridge chips without requiring additional per chip
id checking.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 7712cf5ab33b9a107ddf6ef61f1122622a358951..3623b98ed3fe2ab529617e37ceb41dfcf4fd5882 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -577,30 +577,25 @@ int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
        struct radeon_device *rdev = dev->dev_private;
        struct radeon_connector *radeon_connector = to_radeon_connector(connector);
        int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
+       u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
+       u8 tmp;
 
        if (!ASIC_IS_DCE4(rdev))
                return panel_mode;
 
-       if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
-           ENCODER_OBJECT_ID_NUTMEG)
-               panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
-       else if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
-                ENCODER_OBJECT_ID_TRAVIS) {
-               u8 id[6];
-               int i;
-               for (i = 0; i < 6; i++)
-                       id[i] = radeon_read_dpcd_reg(radeon_connector, 0x503 + i);
-               if (id[0] == 0x73 &&
-                   id[1] == 0x69 &&
-                   id[2] == 0x76 &&
-                   id[3] == 0x61 &&
-                   id[4] == 0x72 &&
-                   id[5] == 0x54)
+       if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
+               /* DP bridge chips */
+               tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
+               if (tmp & 1)
+                       panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
+               else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
+                        (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
                        panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
                else
-                       panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
+                       panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
        } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
-               u8 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
+               /* eDP */
+               tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
                if (tmp & 1)
                        panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
        }