drm/radeon/kms: need to set up ss on DP bridges as well

commit 700698e7c303f5095107c62a81872c2c3dad1702 upstream.

Makes Nutmeg DP to VGA bridges work for me.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=42490

Noticed by Jerome Glisse (after weeks of debugging).

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 24ed30649be96266e56830cdaafe6322ff1067c5..2dab552d4c891e86403fce3048eb1ea20ac3cb6a 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -912,8 +912,8 @@ static void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode
                break;
        }
 
-       if (radeon_encoder->active_device &
-           (ATOM_DEVICE_LCD_SUPPORT | ATOM_DEVICE_DFP_SUPPORT)) {
+       if ((radeon_encoder->active_device & (ATOM_DEVICE_LCD_SUPPORT | ATOM_DEVICE_DFP_SUPPORT)) ||
+           (radeon_encoder_get_dp_bridge_encoder_id(encoder) != ENCODER_OBJECT_ID_NONE)) {
                struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
                struct drm_connector *connector =
                        radeon_get_connector_for_encoder(encoder);