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openmptcprouter/6.6/target/linux/bcm27xx/patches-6.6/0886-drm-vc4-Disable-overrun-interrupts.patch
Ycarus (Yannick Chabanois) 12de1d2995 Add RPI kernel 6.6 support
2024-04-05 20:55:33 +02:00

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1.7 KiB
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From 8dec337920a708a94bd0e00badacfe1f27a6a12e Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Wed, 24 Jan 2024 16:35:11 +0000
Subject: [PATCH 0886/1002] drm/vc4: Disable overrun interrupts
We have a read-modify-write race when updating SCALER_DISPCTRL for
underrun and end-of-frame interrupts.
Ideally it would be fixed via a spinlock or similar, but that will
require a reasonable amount of study to ensure we don't get deadlocks.
The underrun reporting is only for debug, so disable it for now.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
drivers/gpu/drm/vc4/vc4_crtc.c | 2 +-
drivers/gpu/drm/vc4/vc4_kms.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index 10039764fe78..b86b5dc00c15 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -868,7 +868,7 @@ static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)
* the CRTC and encoder already reconfigured, leading to
* underruns. This can be seen when reconfiguring the CRTC.
*/
- if (vc4->gen < VC4_GEN_6)
+ if (0 && vc4->gen < VC4_GEN_6)
vc4_hvs_unmask_underrun(hvs, chan);
}
spin_unlock(&vc4_crtc->irq_lock);
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index 964ecf551a09..ea66914ed5ea 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -391,7 +391,7 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
if (WARN_ON(IS_ERR(new_hvs_state)))
return;
- if (vc4->gen < VC4_GEN_6) {
+ if (0 && vc4->gen < VC4_GEN_6) {
struct drm_crtc_state *new_crtc_state;
struct drm_crtc *crtc;
int i;
--
2.44.0