disp: msm: dsi: allow cmd-engine enable/disable HW op at all times

In cases of continuous splash, when command engine is
enabled/disabled as part of commands that are sent before
continuous splash config is called the HW op will disable the
command engine by the end of the command transfer. As part of
continuous splash handoff, the command engine enable call skips
the hardware operation to actually set the CMD_ENGINE_EN bit
as it is guarded by the skip op flag.

With the current change, we allow the HW op to take place, despite
continuous splash being enabled. This way, the HW will always maintain
the correct state pre and post continuous splash handoff.

Change-Id: Id32ebf6f0d7eac46c118b701c138fcf6b9b10318
Signed-off-by: Steve Cohen <cohens@codeaurora.org>
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>

msm/dsi/dsi_ctrl.c

@@ -444,7 +444,7 @@ static void dsi_ctrl_post_cmd_transfer(struct dsi_ctrl *dsi_ctrl)
 	}
 
 	/* Command engine disable, unmask overflow, remove vote on clocks and gdsc */
-	rc = dsi_ctrl_set_cmd_engine_state(dsi_ctrl, DSI_CTRL_ENGINE_OFF, false);
+	rc = dsi_ctrl_set_cmd_engine_state(dsi_ctrl, DSI_CTRL_ENGINE_OFF);
 	if (rc)
 		DSI_CTRL_ERR(dsi_ctrl, "failed to disable command engine\n");
 
@@ -3423,7 +3423,7 @@ int dsi_ctrl_transfer_prepare(struct dsi_ctrl *dsi_ctrl, u32 flags)
 
 	dsi_ctrl_mask_error_status_interrupts(dsi_ctrl, mask, true);
 
-	rc = dsi_ctrl_set_cmd_engine_state(dsi_ctrl, DSI_CTRL_ENGINE_ON, false);
+	rc = dsi_ctrl_set_cmd_engine_state(dsi_ctrl, DSI_CTRL_ENGINE_ON);
 	if (rc) {
 		DSI_CTRL_ERR(dsi_ctrl, "failed to enable command engine: %d\n", rc);
 		mutex_unlock(&dsi_ctrl->ctrl_lock);
@@ -3827,8 +3827,6 @@ error:
  * dsi_ctrl_set_cmd_engine_state() - set command engine state
  * @dsi_ctrl:            DSI Controller handle.
  * @state:               Engine state.
- * @skip_op:             Boolean to indicate few operations can be skipped.
- *                       Set during the cont-splash or trusted-vm enable case.
  *
  * Command engine state can be modified only when DSI controller power state is
  * set to DSI_CTRL_POWER_LINK_CLK_ON.
@@ -3836,7 +3834,7 @@ error:
  * Return: error code.
  */
 int dsi_ctrl_set_cmd_engine_state(struct dsi_ctrl *dsi_ctrl,
-				  enum dsi_engine_state state, bool skip_op)
+				  enum dsi_engine_state state)
 {
 	int rc = 0;
 
@@ -3863,24 +3861,22 @@ int dsi_ctrl_set_cmd_engine_state(struct dsi_ctrl *dsi_ctrl,
 		goto error;
 	}
 
-	if (!skip_op) {
-		if (state == DSI_CTRL_ENGINE_ON)
-			dsi_ctrl->hw.ops.cmd_engine_en(&dsi_ctrl->hw, true);
-		else
-			dsi_ctrl->hw.ops.cmd_engine_en(&dsi_ctrl->hw, false);
-	}
+	if (state == DSI_CTRL_ENGINE_ON)
+		dsi_ctrl->hw.ops.cmd_engine_en(&dsi_ctrl->hw, true);
+	else
+		dsi_ctrl->hw.ops.cmd_engine_en(&dsi_ctrl->hw, false);
 
 	if (state == DSI_CTRL_ENGINE_ON)
 		dsi_ctrl->cmd_engine_refcount++;
 	else
 		dsi_ctrl->cmd_engine_refcount = 0;
 
-	SDE_EVT32(dsi_ctrl->cell_index, state, skip_op);
+	SDE_EVT32(dsi_ctrl->cell_index, state);
 
 	dsi_ctrl_update_state(dsi_ctrl, DSI_CTRL_OP_CMD_ENGINE, state);
 error:
-	DSI_CTRL_DEBUG(dsi_ctrl, "Set cmd engine state:%d, skip_op:%d, enable count: %d\n",
-			state, skip_op, dsi_ctrl->cmd_engine_refcount);
+	DSI_CTRL_DEBUG(dsi_ctrl, "Set cmd engine state:%d, enable count: %d\n",
+			state, dsi_ctrl->cmd_engine_refcount);
 	return rc;
 }