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Samuel Holland cfaaed5e4a clocksource/arm_arch_timer: Improve Allwinner A64 timer workaround 
commit 8b33dfe0ba1c84c1aab2456590b38195837f1e6e upstream.

Bad counter reads are experienced sometimes when bit 10 or greater rolls
over. Originally, testing showed that at least 10 lower bits would be
set to the same value during these bad reads. However, some users still
reported time skips.

Wider testing revealed that on some chips, occasionally only the lowest
9 bits would read as the anomalous value. During these reads (which
still happen only when bit 10), bit 9 would read as the correct value.

Reduce the mask by one bit to cover these cases as well.

Cc: stable@vger.kernel.org
Fixes: c950ca8c35ee ("clocksource/drivers/arch_timer: Workaround for Allwinner A64 timer instability")
Reported-by: Roman Stratiienko <r.stratiienko@gmail.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210515021439.55316-1-samuel@sholland.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-19 08:53:15 +02:00
..
acpi_pm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 243
2019-06-19 17:09:07 +02:00
arc_timer.c
Merge branch 'timers/vdso' into timers/core
2019-07-03 10:50:21 +02:00
arm_arch_timer.c
clocksource/arm_arch_timer: Improve Allwinner A64 timer workaround
2021-07-19 08:53:15 +02:00
arm_global_timer.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
armv7m_systick.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
2019-05-30 11:29:22 -07:00
asm9260_timer.c
clocksource/drivers/asm9260: Add a check for of_clk_get
2020-01-04 19:17:07 +01:00
bcm2835_timer.c
clocksource/drivers/bcm2835_timer: Fix memory leak of timer
2020-02-24 08:36:28 +01:00
bcm_kona_timer.c
clocksource/drivers: Rename CLOCKSOURCE_OF_DECLARE to TIMER_OF_DECLARE
2017-06-14 11:58:45 +02:00
clksrc_st_lpc.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
clksrc-dbx500-prcmu.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 197
2019-05-30 11:29:22 -07:00
clps711x-timer.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
dummy_timer.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
dw_apb_timer_of.c
clocksource: dw_apb_timer_of: Fix missing clockevent timers
2020-06-22 09:30:55 +02:00
dw_apb_timer.c
clocksource: dw_apb_timer: Make CPU-affiliation being optional
2020-06-22 09:30:55 +02:00
em_sti.c
clocksource: Remove dev_err() usage after platform_get_irq()
2019-08-27 00:31:39 +02:00
exynos_mct.c
Merge branch 'timers/vdso' into timers/core
2019-07-03 10:50:21 +02:00
h8300_timer8.c
clocksource/drivers/h8300_timer8: Fix wrong return value in h8300_8timer_init()
2020-10-01 13:18:16 +02:00
h8300_timer16.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
h8300_tpu.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hyperv_timer.c
clocksource/drivers/hyper-v: Untangle stimers and timesync from clocksources
2020-04-01 11:02:12 +02:00
i8253.c
clockevents/drivers/i8253: Add support for PIT shutdown quirk
2018-11-04 11:04:46 +01:00
ingenic-timer.c
clocksource: Add a new timer-ingenic driver
2019-08-08 15:30:08 -07:00
jcore-pit.c
clocksource/drivers: Rename CLOCKSOURCE_OF_DECLARE to TIMER_OF_DECLARE
2017-06-14 11:58:45 +02:00
Kconfig
clocksource/drivers/ixp4xx: Select TIMER_OF when needed
2021-03-04 10:26:29 +01:00
Makefile
clocksource: Add a new timer-ingenic driver
2019-08-08 15:30:08 -07:00
mips-gic-timer.c
clocksource/drivers/mips-gic-timer: Make gic_compare_irqaction static
2019-03-22 22:59:33 +01:00
mmio.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
mps2-timer.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
mxs_timer.c
clocksource/drivers/mxs_timer: Add missing semicolon when DEBUG is defined
2021-03-04 10:26:29 +01:00
nomadik-mtu.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
numachip.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
2019-06-05 17:36:37 +02:00
renesas-ostm.c
clocksource/drivers/renesas-ostm: Use DIV_ROUND_CLOSEST() helper
2019-08-27 00:31:39 +02:00
samsung_pwm_timer.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
scx200_hrt.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
sh_cmt.c
clocksource/drivers/sh_cmt: Document "cmt-48" as deprecated
2019-08-27 00:31:39 +02:00
sh_mtu2.c
clocksource/drivers/sh_mtu2: Do not loop using platform_get_irq_by_name()
2019-10-18 07:55:16 +02:00
sh_tmu.c
clocksource: Remove dev_err() usage after platform_get_irq()
2019-08-27 00:31:39 +02:00
timer-armada-370-xp.c
clocksource/drivers: Unify the names to timer-* format
2018-10-03 14:37:02 +02:00
timer-atcpit100.c
clocksource/drivers: Set clockevent device cpumask to cpu_possible_mask
2018-07-26 11:26:30 +02:00
timer-atlas7.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 4
2019-05-21 11:28:40 +02:00
timer-atmel-pit.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
timer-atmel-st.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
timer-atmel-tcb.c
clocksource/drivers/tcb_clksrc: Register delay timer
2019-08-27 00:31:39 +02:00
timer-cadence-ttc.c
clocksource/drivers/cadence_ttc: Fix memory leak in ttc_setup_clockevent()
2020-12-30 11:51:17 +01:00
timer-cs5535.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
2019-05-30 11:29:53 -07:00
timer-davinci.c
clocksource: davinci: only enable clockevents once tim34 is initialized
2020-02-24 08:36:46 +01:00
timer-digicolor.c
clocksource/drivers: Rename CLOCKSOURCE_OF_DECLARE to TIMER_OF_DECLARE
2017-06-14 11:58:45 +02:00
timer-efm32.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
timer-fsl-ftm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
timer-fttmr010.c
clocksource/drivers/fttmr010: Fix invalid interrupt register access
2018-12-18 22:22:23 +01:00
timer-gx6605s.c
clocksource/drivers/timer-gx6605s: Fixup counter reload
2020-10-07 08:01:25 +02:00
timer-imx-gpt.c
clocksource/drivers/imx-gpt: Remove unnecessary irq protection
2018-12-18 22:22:23 +01:00
timer-imx-sysctr.c
clocksource/drivers/imx-sysctr: Add internal clock divider handle
2019-08-27 00:31:39 +02:00
timer-imx-tpm.c
clocksource/drivers/timer-imx-tpm: Specify clock name for timer-of
2018-12-18 22:22:23 +01:00
timer-integrator-ap.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
timer-ixp4xx.c
clocksource/drivers/ixp4xx: Implement delay timer
2019-06-25 19:49:18 +02:00
timer-keystone.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
timer-lpc32xx.c
clocksource/drivers: Unify the names to timer-* format
2018-10-03 14:37:02 +02:00
timer-mediatek.c
clocksource/drivers/mediatek: Fix error handling
2019-10-16 17:04:50 +02:00
timer-meson6.c
clocksource/drivers/timer-meson6: Update with SPDX Licence identifier
2019-06-25 19:49:18 +02:00
timer-milbeaut.c
clocksource/drivers/timer-milbeaut: Cleanup common register accesses
2019-05-02 21:55:58 +02:00
timer-mp-csky.c
clocksource/drivers/c-sky: fixup ftrace call-graph panic
2018-12-31 23:17:23 +08:00
timer-npcm7xx.c
clocksource/drivers/npcm: Fix GENMASK and timer operation
2019-08-27 00:31:39 +02:00
timer-nps.c
clocksource/drivers: Rename CLOCKSOURCE_OF_DECLARE to TIMER_OF_DECLARE
2017-06-14 11:58:45 +02:00
timer-of.c
clocksource/drivers/timer-of: Use unique device name instead of timer
2020-01-04 19:17:08 +01:00
timer-of.h
clocksource/drivers/timer-of: Store the device node pointer in 'struct timer_of'
2018-01-08 17:57:24 +01:00
timer-orion.c
clocksource/drivers/orion: Add missing clk_disable_unprepare() on error path
2020-12-30 11:51:17 +01:00
timer-owl.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
timer-oxnas-rps.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201
2019-05-30 11:29:52 -07:00
timer-pistachio.c
clocksource/drivers: Unify the names to timer-* format
2018-10-03 14:37:02 +02:00
timer-prima2.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 4
2019-05-21 11:28:40 +02:00
timer-probe.c
clocksource/drivers: Do not warn on probe defer
2019-08-27 00:31:39 +02:00
timer-pxa.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
timer-qcom.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
2019-06-05 17:36:37 +02:00
timer-rda.c
clocksource/drivers/rda: Add clock driver for RDA8810PL SoC
2018-12-18 22:22:23 +01:00
timer-riscv.c
clocksource: riscv: add notrace to riscv_sched_clock
2020-01-09 10:19:59 +01:00
timer-rockchip.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
timer-sp804.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
timer-sp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
timer-sprd.c
clocksource/drivers/sprd: Register one always-on timer to compensate suspend time
2018-07-26 11:26:34 +02:00
timer-stm32.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
2019-05-30 11:29:22 -07:00
timer-sun4i.c
clocksource: sun4i: Add missing compatibles
2019-08-27 00:31:39 +02:00
timer-sun5i.c
clocksource/drivers/sun5i: Fail gracefully when clock rate is unavailable
2019-02-23 12:13:45 +01:00
timer-tango-xtal.c
clocksource/drivers/tango-xtal: Rename the file for consistency
2019-02-23 12:13:45 +01:00
timer-tegra.c
clocksource/drivers/tegra: Set up maximum-ticks limit properly
2019-06-25 19:49:18 +02:00
timer-ti-32k.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 341
2019-06-05 17:37:07 +02:00
timer-ti-dm.c
clocksource/drivers/timer-ti-dm: Change to new style declaration
2019-05-24 15:51:30 +02:00
timer-u300.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
2019-05-30 11:29:22 -07:00
timer-versatile.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
2019-05-30 11:26:41 -07:00
timer-vf-pit.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
timer-vt8500.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
timer-zevio.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00