diff options
| author |   Linus Walleij <linus.walleij@linaro.org> | 2018-11-15 14:32:03 +0100 |
|---|---|---|
| committer |   Daniel Lezcano <daniel.lezcano@linaro.org> | 2018-12-18 22:22:23 +0100 |
| commit | 85b6fcadcf6626ad520376eacfb2b77090e782ab (patch) | |
| tree | 5b0ef9aa8494e566f112d0201d546ac6325f7d22 /drivers/clocksource/Kconfig | |
| parent | clocksource/drivers/dbx500: Demote dbx500 PRCMU clocksource (diff) | |
| download | linux-dev-85b6fcadcf6626ad520376eacfb2b77090e782ab.tar.xz linux-dev-85b6fcadcf6626ad520376eacfb2b77090e782ab.zip | |
clocksource/drivers/ux500: Drop Ux500 custom SCHED_CLOCK
The two drivers used for Ux500 sched_clock use two Kconfig
symbols to select which of the two gets used as sched_clock.
This isn't right: the workaround is trying to make sure that
the NONSTOP timer is used for sched_clock in order to keep
that clock ticking consistently over a suspend/resume
cycle. (Otherwise sched_clock simply stops during suspend
and continues after resume).
This will notably affect any timetstamped debug prints,
so that they show the absolute number of seconds since the
system was booted and does not loose wall-clock time during
suspend and resume as if time stood still.
The real way to fix this problem is to make sched_clock
take advantage of any NONSTOP clock source on the system
and adjust accordingly, not to try to work around this by
using a different sched_clock depending on what system
we are compiling for. This can solve the problem for
everyone instead of providing a local solution.
Cc: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource/Kconfig')
| -rw-r--r-- | drivers/clocksource/Kconfig | 13 |
1 files changed, 0 insertions, 13 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 55c77e44bb2d..64d5759ddf0e 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -163,12 +163,6 @@ config CLKSRC_NOMADIK_MTU to multiple interrupt generating programmable 32-bit free running decrementing counters. -config CLKSRC_NOMADIK_MTU_SCHED_CLOCK - bool - depends on CLKSRC_NOMADIK_MTU - help - Use the Multi Timer Unit as the sched_clock. - config CLKSRC_DBX500_PRCMU bool "Clocksource PRCMU Timer" if COMPILE_TEST depends on HAS_IOMEM @@ -226,13 +220,6 @@ config INTEGRATOR_AP_TIMER help Enables support for the Integrator-ap timer. -config CLKSRC_DBX500_PRCMU_SCHED_CLOCK - bool "Clocksource PRCMU Timer sched_clock" - depends on (CLKSRC_DBX500_PRCMU && !CLKSRC_NOMADIK_MTU_SCHED_CLOCK) - default y - help - Use the always on PRCMU Timer as sched_clock - config CLKSRC_EFM32 bool "Clocksource for Energy Micro's EFM32 SoCs" if !ARCH_EFM32 depends on OF && ARM && (ARCH_EFM32 || COMPILE_TEST) |