vc4/drm: hdmi: Handle case when bvb clock is null

Pi2/3 have no bvb clock but want the other clocks to remain enabled here

See: #4299
Signed-off-by: Dom Cobley <[email protected]>

Author: popcornmix

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -657,7 +657,8 @@ static void vc4_hdmi_encoder_post_crtc_powerdown(struct drm_encoder *encoder,
 		vc4_hdmi->variant->phy_disable(vc4_hdmi);
 
 	clk_disable_unprepare(vc4_hdmi->pixel_bvb_clock);
-	clk_request_done(vc4_hdmi->bvb_req);
+	if (vc4_hdmi->bvb_req)
+		clk_request_done(vc4_hdmi->bvb_req);
 	clk_request_done(vc4_hdmi->hsm_req);
 	clk_disable_unprepare(vc4_hdmi->pixel_clock);
 
@@ -965,7 +966,8 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 	else
 		bvb_rate = 75000000;
 
-	vc4_hdmi->bvb_req = clk_request_start(vc4_hdmi->pixel_bvb_clock, bvb_rate);
+	if (vc4_hdmi->pixel_bvb_clock)
+		vc4_hdmi->bvb_req = clk_request_start(vc4_hdmi->pixel_bvb_clock, bvb_rate);
 	if (IS_ERR(vc4_hdmi->bvb_req)) {
 		DRM_ERROR("Failed to set pixel bvb clock rate: %ld\n", PTR_ERR(vc4_hdmi->bvb_req));
 		goto err_remove_hsm_req;
@@ -991,7 +993,8 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 	return;
 
 err_remove_bvb_req:
-	clk_request_done(vc4_hdmi->bvb_req);
+	if (vc4_hdmi->bvb_req)
+		clk_request_done(vc4_hdmi->bvb_req);
 err_remove_hsm_req:
 	clk_request_done(vc4_hdmi->hsm_req);
 err_disable_pixel_clock: