drm/amd/display: fix re-enabling stutter for raven

We were overwriting the whole register which was re-enabling
stutter for raven. Now we are reading the register then setting
the values only for pstate.
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce/dce_hwseq.h

@@ -446,6 +446,8 @@ struct dce_hwseq_registers {
 	HWS_SF(, DCHUBBUB_ARB_WATERMARK_CHANGE_CNTL, DCHUBBUB_ARB_WATERMARK_CHANGE_DONE_INTERRUPT_DISABLE, mask_sh), \
 	HWS_SF(, DCHUBBUB_ARB_DRAM_STATE_CNTL, DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_VALUE, mask_sh), \
 	HWS_SF(, DCHUBBUB_ARB_DRAM_STATE_CNTL, DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_ENABLE, mask_sh), \
+	HWS_SF(, DCHUBBUB_ARB_DRAM_STATE_CNTL, DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_VALUE, mask_sh), \
+	HWS_SF(, DCHUBBUB_ARB_DRAM_STATE_CNTL, DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_ENABLE, mask_sh), \
 	HWS_SF(, DCHUBBUB_ARB_SAT_LEVEL, DCHUBBUB_ARB_SAT_LEVEL, mask_sh), \
 	HWS_SF(, DCHUBBUB_ARB_DF_REQ_OUTSTAND, DCHUBBUB_ARB_MIN_REQ_OUTSTAND, mask_sh), \
 	HWS_SF(, DCFCLK_CNTL, DCFCLK_GATE_DIS, mask_sh)
@@ -554,6 +556,8 @@ struct dce_hwseq_registers {
 	type DCHUBBUB_ARB_WATERMARK_CHANGE_DONE_INTERRUPT_DISABLE;\
 	type DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_VALUE;\
 	type DCHUBBUB_ARB_ALLOW_SELF_REFRESH_FORCE_ENABLE;\
+	type DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_VALUE;\
+	type DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_ENABLE;\
 	type DCHUBBUB_ARB_SAT_LEVEL;\
 	type DCHUBBUB_ARB_MIN_REQ_OUTSTAND;\
 	type OPP_PIPE_CLOCK_EN;\

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -253,7 +253,6 @@ static void verify_allow_pstate_change_high(
 
 	unsigned int debug_index = 0x7;
 	unsigned int debug_data;
-	unsigned int force_allow_pstate = 0x30;
 	unsigned int i;
 
 	if (forced_pstate_allow) {
@@ -261,7 +260,9 @@ static void verify_allow_pstate_change_high(
 		 * we verify_allow_pstate_change_high.  so disable force
 		 * here so we can check status
 		 */
-		REG_WRITE(DCHUBBUB_ARB_DRAM_STATE_CNTL, 0);
+		REG_UPDATE_2(DCHUBBUB_ARB_DRAM_STATE_CNTL,
+			     DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_VALUE, 0,
+			     DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_ENABLE, 0);
 		forced_pstate_allow = false;
 	}
 
@@ -304,7 +305,9 @@ static void verify_allow_pstate_change_high(
 	/* force pstate allow to prevent system hang
 	 * and break to debugger to investigate
 	 */
-	REG_WRITE(DCHUBBUB_ARB_DRAM_STATE_CNTL, force_allow_pstate);
+	REG_UPDATE_2(DCHUBBUB_ARB_DRAM_STATE_CNTL,
+		     DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_VALUE, 1,
+		     DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_ENABLE, 1);
 	forced_pstate_allow = true;
 
 	if (should_log_hw_state) {