iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/i915: Busy-spin wait_for condition in atomic contexts

Browse Source 
During modesetting, we need to wait for the hardware to report
readiness by polling the registers. Normally, we call msleep() between
reads, because some state changes may take a whole vblank or more
to complete. However during a panic, we are in an atomic context and
cannot sleep. Instead, busy spin polling the termination condition.

References: https://bugzilla.kernel.org/show_bug.cgi?id=31772
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Chris Wilson 2011-03-24 11:37:03 +00:00
parent 6ee3b5a127
commit 9f01b25048
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/i915/intel_drv.h
View File

@ -39,7 +39,7 @@
ret__ = -ETIMEDOUT; \
break; \
} \
if (W && !in_dbg_master()) msleep(W); \
if (W && !(in_atomic() || in_dbg_master())) msleep(W); \
} \
ret__; \
})