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| author | Eric Anholt | 2017-10-14 02:12:55 +0200 |
|---|---|---|
| committer | Eric Anholt | 2017-10-19 22:20:09 +0200 |
| commit | af0c8c10564aac5b6d67308129ec09c4ad5db476 (patch) | |
| tree | 39407dbc8d0c72b2b190dbfa64822a4038e16e1d /drivers/gpu/drm/drm_drv.c | |
| parent | drm/vc4: Add the DRM_IOCTL_VC4_GEM_MADVISE ioctl (diff) | |
| download | kernel-qcow2-linux-af0c8c10564aac5b6d67308129ec09c4ad5db476.tar.gz kernel-qcow2-linux-af0c8c10564aac5b6d67308129ec09c4ad5db476.tar.xz kernel-qcow2-linux-af0c8c10564aac5b6d67308129ec09c4ad5db476.zip | |
drm/vc4: Fix sleeps during the IRQ handler for DSI transactions.
VC4's DSI1 has a bug where the AXI connection is broken for 32-bit
writes from the CPU, so we use the DMA engine to DMA 32-bit values
into registers instead. That sleeps, so we can't do it from the top
half.
As a solution, use an interrupt thread so that all our writes happen
when sleeping is is allowed.
v2: Use IRQF_ONESHOT (suggested by Boris)
v3: Style nitpicks.
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20171014001255.32005-1-eric@anholt.net
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> (v2)
Diffstat (limited to 'drivers/gpu/drm/drm_drv.c')
0 files changed, 0 insertions, 0 deletions