drm/radeon/kms: minor fixes for eDP with LCD* device tags (v2)

Some systems have LCD* rather than DFP* device tags in the bios
for eDP connectors; notably the new apple iMac. This fixes
things up so eDP connectors with either tag will work.

v2: fix typo

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 56107b3a997f..fd4ef6d18849 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -581,11 +581,16 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                                         }
                                 } else if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
                                         /* may want to enable SS on DP/eDP eventually */
-                                        args.v3.sInput.ucDispPllConfig |=
-                                                DISPPLL_CONFIG_SS_ENABLE;
-                                        if (mode->clock > 165000)
+                                        /*args.v3.sInput.ucDispPllConfig |=
+                                                DISPPLL_CONFIG_SS_ENABLE;*/
+                                        if (encoder_mode == ATOM_ENCODER_MODE_DP)
                                                 args.v3.sInput.ucDispPllConfig |=
-                                                        DISPPLL_CONFIG_DUAL_LINK;
+                                                        DISPPLL_CONFIG_COHERENT_MODE;
+                                        else {
+                                                if (mode->clock > 165000)
+                                                        args.v3.sInput.ucDispPllConfig |=
+                                                                DISPPLL_CONFIG_DUAL_LINK;
+                                        }
                                 }
                                 atom_execute_table(rdev->mode_info.atom_context,
                                                    index, (uint32_t *)&args);