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41 lines
1.4 KiB
Diff
41 lines
1.4 KiB
Diff
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From 8dec337920a708a94bd0e00badacfe1f27a6a12e Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Wed, 24 Jan 2024 16:35:11 +0000
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Subject: [PATCH 0886/1085] drm/vc4: Disable overrun interrupts
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We have a read-modify-write race when updating SCALER_DISPCTRL for
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underrun and end-of-frame interrupts.
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Ideally it would be fixed via a spinlock or similar, but that will
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require a reasonable amount of study to ensure we don't get deadlocks.
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The underrun reporting is only for debug, so disable it for now.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/gpu/drm/vc4/vc4_crtc.c | 2 +-
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drivers/gpu/drm/vc4/vc4_kms.c | 2 +-
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2 files changed, 2 insertions(+), 2 deletions(-)
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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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@@ -868,7 +868,7 @@ static void vc4_crtc_handle_page_flip(st
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* the CRTC and encoder already reconfigured, leading to
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* underruns. This can be seen when reconfiguring the CRTC.
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*/
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- if (vc4->gen < VC4_GEN_6)
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+ if (0 && vc4->gen < VC4_GEN_6)
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vc4_hvs_unmask_underrun(hvs, chan);
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}
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spin_unlock(&vc4_crtc->irq_lock);
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--- a/drivers/gpu/drm/vc4/vc4_kms.c
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+++ b/drivers/gpu/drm/vc4/vc4_kms.c
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@@ -391,7 +391,7 @@ static void vc4_atomic_commit_tail(struc
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if (WARN_ON(IS_ERR(new_hvs_state)))
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return;
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- if (vc4->gen < VC4_GEN_6) {
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+ if (0 && vc4->gen < VC4_GEN_6) {
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struct drm_crtc_state *new_crtc_state;
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struct drm_crtc *crtc;
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int i;
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