drm/vc4: Fix get_vblank_counter with proper no-op for Linux 4.4+

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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>
Reviewed-by: Eric Anholt <eric@anholt.net>
Fixes: c8b75bca92 ("drm/vc4: Add KMS support for Raspberry Pi.")

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Mario Kleiner 2016-05-06 19:26:05 +02:00 • committed by Eric Anholt

parent 1a695a905c

commit 792293cfd5

1 changed files with 1 additions and 1 deletions

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drivers/gpu/drm/vc4/vc4_drv.c

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