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39 lines
1.4 KiB
Diff
39 lines
1.4 KiB
Diff
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From c4bd9665b145cacfdf9cbd5f3d83ed0961080236 Mon Sep 17 00:00:00 2001
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From: Mario Kleiner <mario.kleiner.de@gmail.com>
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Date: Tue, 19 Jul 2016 20:59:01 +0200
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Subject: [PATCH] drm/vc4: Enable/Disable vblanks properly in crtc en/disable.
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Add missing drm_crtc_vblank_on/off() calls so vblank irq
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handling/updating/timestamping never runs with a crtc shut down
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or during its shutdown/startup, as that causes large jumps in
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vblank count and trouble for compositors.
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Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/gpu/drm/vc4/vc4_crtc.c | 6 ++++++
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1 file changed, 6 insertions(+)
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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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@@ -468,6 +468,9 @@ static void vc4_crtc_disable(struct drm_
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int ret;
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require_hvs_enabled(dev);
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+ /* Disable vblank irq handling before crtc is disabled. */
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+ drm_crtc_vblank_off(crtc);
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+
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if (VC4_DSI_USE_FIRMWARE_SETUP &&
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(CRTC_READ(PV_V_CONTROL) & PV_VCONTROL_DSI)) {
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/* Skip disabling the PV/HVS for the channel if it was
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@@ -531,6 +534,9 @@ static void vc4_crtc_enable(struct drm_c
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/* Turn on the pixel valve, which will emit the vstart signal. */
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CRTC_WRITE(PV_V_CONTROL,
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CRTC_READ(PV_V_CONTROL) | PV_VCONTROL_VIDEN);
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+
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+ /* Enable vblank irq handling after crtc is started. */
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+ drm_crtc_vblank_on(crtc);
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}
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static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
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