disp: msm: update clk and cmd state switch sequence

Disable double buffer vsync configuration while
enabling clk and cmd state switch sequence. Leaving
this configuration in enable state may cause different
issues for different state switch. Clock state switch
may see a vsync delay for solver disable. Command
state switch may not update the vsync source.

Change-Id: I910fc7e33a20a04b602435020173d85a4ee926d1
Signed-off-by: Dhaval Patel <[email protected]>

msm/sde_rsc_hw_v3.c

@@ -400,6 +400,10 @@ static int sde_rsc_state_update_v3(struct sde_rsc_priv *rsc,
 	case SDE_RSC_CMD_STATE:
 		pr_debug("command mode handling\n");
 
+		dss_reg_w(&rsc->wrapper_io, SDE_RSCC_WRAPPER_OVERRIDE_CTRL,
+							0x0, rsc->debug_mode);
+		wmb(); /* disable double buffer config before vsync select */
+
 		dss_reg_w(&rsc->wrapper_io, SDE_RSCC_WRAPPER_OVERRIDE_CTRL2,
 				BIT(1) | BIT(2) | BIT(3), rsc->debug_mode);
 
@@ -455,10 +459,17 @@ static int sde_rsc_state_update_v3(struct sde_rsc_priv *rsc,
 
 		reg = dss_reg_r(&rsc->wrapper_io,
 			SDE_RSCC_WRAPPER_OVERRIDE_CTRL, rsc->debug_mode);
-		reg &= ~BIT(0);
+		reg &= ~(BIT(0) | BIT(8));
 		dss_reg_w(&rsc->wrapper_io, SDE_RSCC_WRAPPER_OVERRIDE_CTRL,
 							reg, rsc->debug_mode);
 		wmb(); /* make sure that solver mode is disabled */
+
+		reg = dss_reg_r(&rsc->wrapper_io,
+			SDE_RSCC_WRAPPER_OVERRIDE_CTRL, rsc->debug_mode);
+		reg |= BIT(8);
+		dss_reg_w(&rsc->wrapper_io, SDE_RSCC_WRAPPER_OVERRIDE_CTRL,
+							reg, rsc->debug_mode);
+		wmb(); /* enable double buffer vsync configuration */
 		break;
 
 	case SDE_RSC_IDLE_STATE: