[PATCH] drm/radeon: fix PLL sharing on DCE6.1

[Lucas Stach <dev@lynxeye.de>]

On DCE6.1 PPLL2 is exclusively available to UNIPHYA, so it should not
be taken into consideration when looking for an already enabled PLL
to be shared with other outputs.

This fixes the broken VGA port (TRAVIS DP->VGA bridge) on my Richland
based laptop, where the internal display is connected to UNIPHYA through
a TRAVIS DP->LVDS bridge.

Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=78987

Signed-off-by: Lucas Stach <dev@lynxeye.de>
---
 drivers/gpu/drm/radeon/atombios_crtc.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index b80b08f..401bcbd 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1739,7 +1739,8 @@ static u32 radeon_get_pll_use_mask(struct drm_crtc *crtc)
  * also in DP mode.  For DP, a single PPLL can be used for all DP
  * crtcs/encoders.
  */
-static int radeon_get_shared_dp_ppll(struct drm_crtc *crtc)
+static int radeon_get_shared_dp_ppll(struct radeon_device *rdev,
+				     struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
 	struct drm_crtc *test_crtc;
@@ -1751,6 +1752,10 @@ static int radeon_get_shared_dp_ppll(struct drm_crtc *crtc)
 		test_radeon_crtc = to_radeon_crtc(test_crtc);
 		if (test_radeon_crtc->encoder &&
 		    ENCODER_MODE_IS_DP(atombios_get_encoder_mode(test_radeon_crtc->encoder))) {
+			/* PPLL2 is exclusive to UNIPHYA on DCE61 */
+			if (ASIC_IS_DCE61(rdev) && !ASIC_IS_DCE8(rdev) &&
+			    test_radeon_crtc->pll_id == ATOM_PPLL2)
+				continue;
 			/* for DP use the same PLL for all */
 			if (test_radeon_crtc->pll_id != ATOM_PPLL_INVALID)
 				return test_radeon_crtc->pll_id;
@@ -1859,7 +1864,7 @@ static int radeon_atom_pick_pll(struct drm_crtc *crtc)
 				return ATOM_PPLL_INVALID;
 			else {
 				/* use the same PPLL for all DP monitors */
-				pll = radeon_get_shared_dp_ppll(crtc);
+				pll = radeon_get_shared_dp_ppll(rdev, crtc);
 				if (pll != ATOM_PPLL_INVALID)
 					return pll;
 			}
@@ -1907,7 +1912,7 @@ static int radeon_atom_pick_pll(struct drm_crtc *crtc)
 				return ATOM_PPLL_INVALID;
 			else {
 				/* use the same PPLL for all DP monitors */
-				pll = radeon_get_shared_dp_ppll(crtc);
+				pll = radeon_get_shared_dp_ppll(rdev, crtc);
 				if (pll != ATOM_PPLL_INVALID)
 					return pll;
 			}
@@ -1962,7 +1967,7 @@ static int radeon_atom_pick_pll(struct drm_crtc *crtc)
 				return ATOM_DCPLL;
 			else {
 				/* use the same PPLL for all DP monitors */
-				pll = radeon_get_shared_dp_ppll(crtc);
+				pll = radeon_get_shared_dp_ppll(rdev, crtc);
 				if (pll != ATOM_PPLL_INVALID)
 					return pll;
 			}
-- 
2.5.5

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