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27 lines
863 B
Diff
27 lines
863 B
Diff
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From 9f9d67a11cfd6318d2bd1321090c0950242cfa25 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.org>
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Date: Tue, 18 Jun 2019 21:37:45 +0100
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Subject: [PATCH] drm/vc4: Limit fkms to modes <= 85Hz
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Selecting 1080p100 and 120 has very limited gain, but don't want
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to block VGA85 and similar.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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drivers/gpu/drm/vc4/vc4_firmware_kms.c | 4 ++++
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1 file changed, 4 insertions(+)
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--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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@@ -823,6 +823,10 @@ vc4_crtc_mode_valid(struct drm_crtc *crt
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return MODE_NO_DBLESCAN;
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}
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+ /* Disable refresh rates > 85Hz as limited gain from them */
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+ if (drm_mode_vrefresh(mode) > 85)
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+ return MODE_BAD_VVALUE;
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+
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/* Limit the pixel clock based on the HDMI clock limits from the
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* firmware
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*/
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