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- From 3b82a9f86033a7a0cef86738f45bd191742a55db Mon Sep 17 00:00:00 2001
- From: Mario Kleiner <mario.kleiner.de@gmail.com>
- Date: Fri, 6 May 2016 19:26:05 +0200
- Subject: [PATCH] drm/vc4: Fix get_vblank_counter with proper no-op for Linux
- 4.4+
- get_vblank_counter hooked up to drm_vblank_count() which alway was
- non-sensical but didn't hurt in the past. Since Linux 4.4 it
- triggers a WARN_ON_ONCE in drm_update_vblank_count on first vblank
- irq disable, so fix it by hooking to drm_vblank_no_hw_counter().
- Tested against Raspian kernel 4.4.8 tree on RPi 2B.
- Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
- Cc: Eric Anholt <eric@anholt.net>
- Signed-off-by: Eric Anholt <eric@anholt.net>
- ---
- drivers/gpu/drm/vc4/vc4_drv.c | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
- --- a/drivers/gpu/drm/vc4/vc4_drv.c
- +++ b/drivers/gpu/drm/vc4/vc4_drv.c
- @@ -102,7 +102,7 @@ static struct drm_driver vc4_drm_driver
-
- .enable_vblank = vc4_enable_vblank,
- .disable_vblank = vc4_disable_vblank,
- - .get_vblank_counter = drm_vblank_count,
- + .get_vblank_counter = drm_vblank_no_hw_counter,
-
- #if defined(CONFIG_DEBUG_FS)
- .debugfs_init = vc4_debugfs_init,
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