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31 lines
1 KiB
Diff
31 lines
1 KiB
Diff
From 883a1a5bf14abc9b3a014a3907772cd0b3129c8a 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 672/678] 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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diff --git a/drivers/gpu/drm/vc4/vc4_firmware_kms.c b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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index 6e9a20f54200..b5959abecf1a 100644
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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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@@ -822,6 +822,10 @@ vc4_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode)
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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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--
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2.19.1
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