drm/radeon: fix dpms on/off on trinity/aruba v2

The external encoder need to be setup again before enabling the
transmiter. This seems to be only needed on some trinity/aruba
to fix dpms on.

v2: Add comment, only setup again on dce6 ie aruba or newer.

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

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 7dfc62fae6a62f8ddb222a6270957149d630b619..f9bc27fe269a125b54803350b838a9062f0e6337 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -1392,10 +1392,18 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode)
        case DRM_MODE_DPMS_ON:
                /* some early dce3.2 boards have a bug in their transmitter control table */
                if ((rdev->family == CHIP_RV710) || (rdev->family == CHIP_RV730) ||
-                   ASIC_IS_DCE41(rdev) || ASIC_IS_DCE5(rdev))
+                   ASIC_IS_DCE41(rdev) || ASIC_IS_DCE5(rdev)) {
+                       if (ASIC_IS_DCE6(rdev)) {
+                               /* It seems we need to call ATOM_ENCODER_CMD_SETUP again
+                                * before reenabling encoder on DPMS ON, otherwise we never
+                                * get picture
+                                */
+                               atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_SETUP, 0);
+                       }
                        atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE, 0, 0);
-               else
+               } else {
                        atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE_OUTPUT, 0, 0);
+               }
                if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(encoder)) && connector) {
                        if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
                                atombios_set_edp_panel_power(connector,