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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
@@ -607,7 +607,8 @@ 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);
@@ -931,7 +932,8 @@ 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);
@@ -943,7 +945,8 @@ 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);
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