diff options
| author | Doug Brown <doug@schmorgal.com> | 2022-12-03 16:51:17 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-14 10:15:14 +0100 |
| commit | 480bc6a165d6fe23d3521bf273fe47bd561970b3 (patch) | |
| tree | ac69a6cd9d1de29ef3cb5570928c7e3b26c8fd9e /lib/debugobjects.c | |
| parent | d1b3164d0e11a2849c22822cfc606eda34e24c36 (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 'lib/debugobjects.c')
0 files changed, 0 insertions, 0 deletions