diff options
| author | Doug Brown | 2022-12-03 16:51:17 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2022-12-31 13:31:54 +0100 |
| commit | 3c6dfce2c76c46dd555d2c91e2797d572a497d48 (patch) | |
| tree | 982fc731ef4af1639db26b503892cbb4d0362b3e /fs | |
| parent | 65f1ff9011f1d533d0a23c3294d82e0146f2648b (diff) | |
ARM: mmp: fix timer_read delay
[ Upstream commit e348b4014c31041e13ff370669ba3348c4d385e3 ]
timer_read() was using an empty 100-iteration loop to wait for the
TMR_CVWR register to capture the latest timer counter value. The delay
wasn't long enough. This resulted in CPU idle time being extremely
underreported on PXA168 with CONFIG_NO_HZ_IDLE=y.
Switch to the approach used in the vendor kernel, which implements the
capture delay by reading TMR_CVWR a few times instead.
Fixes: 49cbe78637eb ("[ARM] pxa: add base support for Marvell's PXA168 processor line")
Signed-off-by: Doug Brown <doug@schmorgal.com>
Link: https://lore.kernel.org/r/20221204005117.53452-3-doug@schmorgal.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions