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35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
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From d984fd8907736d37656c558e213cfe087e43a7ce Mon Sep 17 00:00:00 2001
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From: Dom Cobley <popcornmix@gmail.com>
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Date: Mon, 12 Aug 2024 13:31:58 +0100
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Subject: [PATCH 1225/1350] drm/vc4: Add a delay after disabling hdmi phy
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output
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There appears to be a requirement for some devices
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(I'm testing with a 8K VRROOM 40Gbps HDMI switch)
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for a measable delay between removing the hdmi phy output from
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the old mode, to enabling the hdmi phy output for the new mode.
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Without the delay, a mode switch has a small change of getting a permanent
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'no signal', which requires a subsequent mode switch or a unplug/replug
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to redetect.
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Switching between 4kp24/25/30 modes fails about 5% of time in my testing.
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Add a delay to make it impossible to switch faster than this.
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Signed-off-by: Dom Cobley <popcornmix@gmail.com>
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---
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drivers/gpu/drm/vc4/vc4_crtc.c | 1 +
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1 file changed, 1 insertion(+)
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--- a/drivers/gpu/drm/vc4/vc4_crtc.c
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+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
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@@ -668,6 +668,7 @@ static void vc4_crtc_atomic_disable(stru
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* someone was waiting it.
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*/
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vc4_crtc_send_vblank(crtc);
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+ msleep(20);
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}
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static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
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