[PATCH 80/87] drm/amd/display: fix mpcc assert condition

[sunpeng.li at amd.com]

From: Eric Yang <Eric.Yang2 at amd.com>

[Why]
In DCN2x asic, the MPCC status register definition changed, and
our logic for assert is incorrect. disabled is valid state,
where we should see idle and not busy, where as in not
disabled state, we should see not idle.

[How]
Change assert condition to be more sensible.

Signed-off-by: Eric Yang <Eric.Yang2 at amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 .../gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c  | 23 +++++++++----------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c
index f4d3008e5efa..67f0128f0b38 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c
@@ -446,23 +446,22 @@ void mpc2_assert_mpcc_idle_before_connect(struct mpc *mpc, int mpcc_id)
 {
 	struct dcn20_mpc *mpc20 = TO_DCN20_MPC(mpc);
 	unsigned int top_sel, mpc_busy, mpc_idle, mpc_disabled;
-	REG_GET(MPCC_STATUS[mpcc_id], MPCC_DISABLED, &mpc_disabled);
-
-	if (mpc_disabled) {
-		ASSERT(0);
-		return;
-	}
 
 	REG_GET(MPCC_TOP_SEL[mpcc_id],
 			MPCC_TOP_SEL, &top_sel);
 
-	if (top_sel == 0xf) {
-		REG_GET_2(MPCC_STATUS[mpcc_id],
-				MPCC_BUSY, &mpc_busy,
-				MPCC_IDLE, &mpc_idle);
+	REG_GET_3(MPCC_STATUS[mpcc_id],
+			MPCC_BUSY, &mpc_busy,
+			MPCC_IDLE, &mpc_idle,
+			MPCC_DISABLED, &mpc_disabled);
 
-		ASSERT(mpc_busy == 0);
-		ASSERT(mpc_idle == 1);
+	if (top_sel == 0xf) {
+		ASSERT(!mpc_busy);
+		ASSERT(mpc_idle);
+		ASSERT(mpc_disabled);
+	} else {
+		ASSERT(!mpc_disabled);
+		ASSERT(!mpc_idle);
 	}
 }
 
-- 
2.22.0