diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0580-drm-vc4-Limit-fkms-to-modes-85Hz.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0580-drm-vc4-Limit-fkms-to-modes-85Hz.patch | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0580-drm-vc4-Limit-fkms-to-modes-85Hz.patch b/target/linux/bcm27xx/patches-4.19/950-0580-drm-vc4-Limit-fkms-to-modes-85Hz.patch new file mode 100644 index 0000000000..b95a4db6d3 --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0580-drm-vc4-Limit-fkms-to-modes-85Hz.patch @@ -0,0 +1,26 @@ +From 06a0e398e7dcd6ba0a61713596c32ec6d43b47c8 Mon Sep 17 00:00:00 2001 +From: Dave Stevenson <dave.stevenson@raspberrypi.org> +Date: Tue, 18 Jun 2019 21:37:45 +0100 +Subject: [PATCH] drm/vc4: Limit fkms to modes <= 85Hz + +Selecting 1080p100 and 120 has very limited gain, but don't want +to block VGA85 and similar. + +Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org> +--- + drivers/gpu/drm/vc4/vc4_firmware_kms.c | 4 ++++ + 1 file changed, 4 insertions(+) + +--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c ++++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c +@@ -822,6 +822,10 @@ vc4_crtc_mode_valid(struct drm_crtc *crt + return MODE_NO_DBLESCAN; + } + ++ /* Disable refresh rates > 85Hz as limited gain from them */ ++ if (drm_mode_vrefresh(mode) > 85) ++ return MODE_BAD_VVALUE; ++ + /* Limit the pixel clock based on the HDMI clock limits from the + * firmware + */ |