drm/vc4: hdmi: Rework the pre_crtc_configure error handling

Since our pre_crtc_configure hook returned void, we didn't implement a
goto-based error path handling, leading to errors like failing to put
back the device in pm_runtime in all the error paths, but also failing
to disable the pixel clock if clk_set_min_rate on the HSM clock fails.

Move to a goto-based implementation to have an easier consitency.

Fixes: 4f6e3d6 ("drm/vc4: Add runtime PM support to the HDMI encoder driver")
Link: https://patchwork.freedesktop.org/patch/msgid/20210819135931.895976-4-maxime@cerno.tech
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

Author: mripard

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -933,15 +933,16 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 	ret = clk_set_rate(vc4_hdmi->pixel_clock, pixel_rate);
 	if (ret) {
 		DRM_ERROR("Failed to set pixel clock rate: %d\n", ret);
-		return;
+		goto err_put_runtime_pm;
 	}
 
 	ret = clk_prepare_enable(vc4_hdmi->pixel_clock);
 	if (ret) {
 		DRM_ERROR("Failed to turn on pixel clock: %d\n", ret);
-		return;
+		goto err_put_runtime_pm;
 	}
 
+
 	vc4_hdmi_cec_update_clk_div(vc4_hdmi);
 
 	if (pixel_rate > 297000000)
@@ -954,15 +955,13 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 	ret = clk_set_min_rate(vc4_hdmi->pixel_bvb_clock, bvb_rate);
 	if (ret) {
 		DRM_ERROR("Failed to set pixel bvb clock rate: %d\n", ret);
-		clk_disable_unprepare(vc4_hdmi->pixel_clock);
-		return;
+		goto err_disable_pixel_clock;
 	}
 
 	ret = clk_prepare_enable(vc4_hdmi->pixel_bvb_clock);
 	if (ret) {
 		DRM_ERROR("Failed to turn on pixel bvb clock: %d\n", ret);
-		clk_disable_unprepare(vc4_hdmi->pixel_clock);
-		return;
+		goto err_disable_pixel_clock;
 	}
 
 	if (vc4_hdmi->variant->phy_init)
@@ -975,6 +974,15 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 
 	if (vc4_hdmi->variant->set_timings)
 		vc4_hdmi->variant->set_timings(vc4_hdmi, conn_state, mode);
+
+	return;
+
+err_disable_pixel_clock:
+	clk_disable_unprepare(vc4_hdmi->pixel_clock);
+err_put_runtime_pm:
+	pm_runtime_put(&vc4_hdmi->pdev->dev);
+
+	return;
 }
 
 static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder,