openwrt/target/linux/bcm27xx/patches-5.10/950-0456-drm-vc4-hdmi-Update-the-CEC-clock-divider-on-HSM-rat.patch

From beadd8dfb16c626c2261fc6f8aab935cd7412603 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Mon, 11 Jan 2021 15:23:01 +0100
Subject: [PATCH] drm/vc4: hdmi: Update the CEC clock divider on HSM
 rate change

As part of the enable sequence we might change the HSM clock rate if the
pixel rate is different than the one we were already dealing with.

On the BCM2835 however, the CEC clock derives from the HSM clock so any
rate change will need to be reflected in the CEC clock divider to output
40kHz.

Fixes: cd4cb49dc5bb ("drm/vc4: hdmi: Adjust HSM clock rate depending on pixel rate")
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -804,6 +804,8 @@ static void vc4_hdmi_encoder_pre_crtc_co
 
 	vc4_hdmi_cec_update_clk_div(vc4_hdmi);
 
+	vc4_hdmi_cec_update_clk_div(vc4_hdmi);
+
 	/*
 	 * FIXME: When the pixel freq is 594MHz (4k60), this needs to be setup
 	 * at 300MHz.