drm/radeon/kms: fix TRAVIS panel setup

Different versions of the DP to LVDS bridge chip
need different panel mode settings depending on
the chip version used.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=41569

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index a71557ce01dcfb6bea8ebf78aa2af51f056c080d..552b436451fd49d54df3edb412a63734debad250 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -564,9 +564,21 @@ int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
            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)
-               panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
-       else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
+                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)
+                       panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
+               else
+                       panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
+       } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
                u8 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
                if (tmp & 1)
                        panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;