diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0456-drm-vc4-hdmi-Update-the-CEC-clock-divider-on-HSM-rat.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0456-drm-vc4-hdmi-Update-the-CEC-clock-divider-on-HSM-rat.patch | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0456-drm-vc4-hdmi-Update-the-CEC-clock-divider-on-HSM-rat.patch b/target/linux/bcm27xx/patches-5.10/950-0456-drm-vc4-hdmi-Update-the-CEC-clock-divider-on-HSM-rat.patch new file mode 100644 index 0000000000..8c64066094 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0456-drm-vc4-hdmi-Update-the-CEC-clock-divider-on-HSM-rat.patch @@ -0,0 +1,31 @@ +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 +@@ -801,6 +801,8 @@ 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. |