drm/vc4: crtc: Reduce PV fifo threshold on hvs4

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[ Upstream commit eb9dfdd1ed ]

Experimentally have found PV on hvs4 reports fifo full
error with expected settings and does not with one less

This appears as:
[drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:82:crtc-3] flip_done timed out

with bit 10 of PV_STAT set "HVS driving pixels when the PV FIFO is full"

Fixes: c8b75bca92 ("drm/vc4: Add KMS support for Raspberry Pi.")
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210318161328.1471556-3-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Dom Cobley 2021-03-18 17:13:28 +01:00 • committed by Greg Kroah-Hartman

parent d8a0861e26

commit 9998522074

1 changed files with 17 additions and 0 deletions

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drivers/gpu/drm/vc4/vc4_crtc.c

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