[PATCH v8 07/15] drm/msm/dp: move the pixel clock control to its own API

[Yongxing Mou <yongxing.mou@oss.qualcomm.com>]

Enable/Disable of DP pixel clock happens in multiple code paths
leading to code duplication. Move it into individual helpers so that
the helpers can be called wherever necessary.

Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_ctrl.c | 80 +++++++++++++++++++++-------------------
 1 file changed, 42 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 711579de899d..a79d9bb93cd0 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -2172,6 +2172,41 @@ static bool msm_dp_ctrl_send_phy_test_pattern(struct msm_dp_ctrl_private *ctrl)
 	return success;
 }
 
+static int msm_dp_ctrl_on_pixel_clk(struct msm_dp_ctrl_private *ctrl, unsigned long pixel_rate)
+{
+	int ret;
+
+	ret = clk_set_rate(ctrl->pixel_clk, pixel_rate * 1000);
+	if (ret) {
+		DRM_ERROR("Failed to set pixel clock rate. ret=%d\n", ret);
+		return ret;
+	}
+
+	if (WARN_ON_ONCE(ctrl->stream_clks_on))
+		return 0;
+
+	ret = clk_prepare_enable(ctrl->pixel_clk);
+	if (ret) {
+		DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
+		return ret;
+	}
+	ctrl->stream_clks_on = true;
+
+	return ret;
+}
+
+static void msm_dp_ctrl_off_pixel_clk(struct msm_dp_ctrl *msm_dp_ctrl)
+{
+	struct msm_dp_ctrl_private *ctrl;
+
+	ctrl = container_of(msm_dp_ctrl, struct msm_dp_ctrl_private, msm_dp_ctrl);
+
+	if (ctrl->stream_clks_on) {
+		clk_disable_unprepare(ctrl->pixel_clk);
+		ctrl->stream_clks_on = false;
+	}
+}
+
 static int msm_dp_ctrl_process_phy_test_request(struct msm_dp_ctrl_private *ctrl)
 {
 	int ret;
@@ -2197,22 +2232,9 @@ static int msm_dp_ctrl_process_phy_test_request(struct msm_dp_ctrl_private *ctrl
 	}
 
 	pixel_rate = ctrl->panel->msm_dp_mode.drm_mode.clock;
-	ret = clk_set_rate(ctrl->pixel_clk, pixel_rate * 1000);
-	if (ret) {
-		DRM_ERROR("Failed to set pixel clock rate. ret=%d\n", ret);
+	ret = msm_dp_ctrl_on_pixel_clk(ctrl, pixel_rate);
+	if (ret)
 		return ret;
-	}
-
-	if (ctrl->stream_clks_on) {
-		drm_dbg_dp(ctrl->drm_dev, "pixel clks already enabled\n");
-	} else {
-		ret = clk_prepare_enable(ctrl->pixel_clk);
-		if (ret) {
-			DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
-			return ret;
-		}
-		ctrl->stream_clks_on = true;
-	}
 
 	msm_dp_ctrl_send_phy_test_pattern(ctrl);
 
@@ -2515,26 +2537,13 @@ int msm_dp_ctrl_on_stream(struct msm_dp_ctrl *msm_dp_ctrl, bool force_link_train
 		ret = msm_dp_ctrl_enable_mainlink_clocks(ctrl);
 		if (ret) {
 			DRM_ERROR("Failed to start link clocks. ret=%d\n", ret);
-			goto end;
+			return ret;
 		}
 	}
 
-	ret = clk_set_rate(ctrl->pixel_clk, pixel_rate * 1000);
-	if (ret) {
-		DRM_ERROR("Failed to set pixel clock rate. ret=%d\n", ret);
-		goto end;
-	}
-
-	if (ctrl->stream_clks_on) {
-		drm_dbg_dp(ctrl->drm_dev, "pixel clks already enabled\n");
-	} else {
-		ret = clk_prepare_enable(ctrl->pixel_clk);
-		if (ret) {
-			DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
-			goto end;
-		}
-		ctrl->stream_clks_on = true;
-	}
+	ret = msm_dp_ctrl_on_pixel_clk(ctrl, pixel_rate);
+	if (ret)
+		return ret;
 
 	if (force_link_train || !msm_dp_ctrl_channel_eq_ok(ctrl))
 		msm_dp_ctrl_link_retrain(ctrl);
@@ -2573,7 +2582,6 @@ int msm_dp_ctrl_on_stream(struct msm_dp_ctrl *msm_dp_ctrl, bool force_link_train
 	drm_dbg_dp(ctrl->drm_dev,
 		"mainlink %s\n", mainlink_ready ? "READY" : "NOT READY");
 
-end:
 	return ret;
 }
 
@@ -2621,11 +2629,7 @@ void msm_dp_ctrl_off(struct msm_dp_ctrl *msm_dp_ctrl)
 
 	msm_dp_ctrl_reset(&ctrl->msm_dp_ctrl);
 
-	if (ctrl->stream_clks_on) {
-		clk_disable_unprepare(ctrl->pixel_clk);
-		ctrl->stream_clks_on = false;
-	}
-
+	msm_dp_ctrl_off_pixel_clk(msm_dp_ctrl);
 	dev_pm_opp_set_rate(ctrl->dev, 0);
 	msm_dp_ctrl_link_clk_disable(&ctrl->msm_dp_ctrl);
 

-- 
2.43.0