openwrt/target/linux/bcm27xx/patches-5.10/950-0577-vc4-drm-hdmi-Handle-case-when-bvb-clock-is-null.patch

From 33e8e066af31c3af1d18d615f5e8ab5e528e0000 Mon Sep 17 00:00:00 2001
From: Dom Cobley <popcornmix@gmail.com>
Date: Wed, 21 Apr 2021 15:15:42 +0100
Subject: [PATCH] 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: https://github.com/raspberrypi/linux/issues/4299
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -610,7 +610,8 @@ static void vc4_hdmi_encoder_post_crtc_p
 		   HDMI_READ(HDMI_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE);
 
 	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_disable_unprepare(vc4_hdmi->hsm_clock);
 	clk_request_done(vc4_hdmi->hsm_req);
 	clk_disable_unprepare(vc4_hdmi->pixel_clock);
@@ -935,7 +936,8 @@ static void vc4_hdmi_encoder_pre_crtc_co
 	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));
 		clk_request_done(vc4_hdmi->hsm_req);
@@ -947,7 +949,8 @@ static void vc4_hdmi_encoder_pre_crtc_co
 	ret = clk_prepare_enable(vc4_hdmi->pixel_bvb_clock);
 	if (ret) {
 		DRM_ERROR("Failed to turn on pixel bvb clock: %d\n", ret);
-		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->hsm_clock);
 		clk_disable_unprepare(vc4_hdmi->pixel_clock);