drm/radeon/kms: fix regression is handling >2 heads on cedar/caicos

Need to add support for 4 crtcs when setting the possible crtcs
for the encoders.

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

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index b293487e5aa3dc2193fee36eb0f9c00fe7080a0c..319d85d7e759b4f0599f2c5df2b9182568bd993d 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -2323,6 +2323,9 @@ radeon_add_atom_encoder(struct drm_device *dev,
        default:
                encoder->possible_crtcs = 0x3;
                break;
+       case 4:
+               encoder->possible_crtcs = 0xf;
+               break;
        case 6:
                encoder->possible_crtcs = 0x3f;
                break;