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v7.2
linux/drivers/clocksource
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Marc Zyngier 94f39e4c01 clocksource/drivers/arm_arch_timer: Workaround bcm2712 broken EL2 virtual timer 
It appears that the bcm2712 SoC found in the relatively popular RPi5 has a
broken EL2 virtual timer.

Tthe reason why the timer isn't working is unknown (the timer is ticking,
but the interrupt never fires), and the SoC vendor doesn't communicate on
the reason why this isn't working, leaving users and maintainers in the
dark.

Paper over the issue by detecting the broken HW, falling back to the
physical timer instead, and let the user know about it.  Also taint the
kernel as the machine is definitely not compliant with the spec, and it's
unknown what else is wrong with it.

Reported-by: John <therealgraysky@proton.me>
Reported-by: Daniel Drake <dan@reactivated.net>
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Gary Guo <gary@garyguo.net>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: Daniel Lezcano <daniel.lezcano@kernel.org>
Link: https://patch.msgid.link/20260710080958.491620-1-maz@kernel.org
2026-08-12 17:09:29 +02:00
..
acpi_pm.c clocksource: Rewrite watchdog code completely 2026-03-20 13:36:32 +01:00
arc_timer.c clocksource/drivers/arc_timer: Eliminate redefined macro error 2021-10-16 22:15:01 +02:00
arm_arch_timer_mmio.c clocksource/drivers/arm_arch_timer_mmio: Prevent driver unbind 2025-11-26 11:24:47 +01:00
arm_arch_timer.c clocksource/drivers/arm_arch_timer: Workaround bcm2712 broken EL2 virtual timer 2026-08-12 17:09:29 +02:00
arm_global_timer.c clocksource/drivers/arm_global_timer: Add auto-detection for initial prescaler values 2025-09-23 12:41:58 +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 missing clk_disable_unprepare in asm9260_timer_init 2024-09-06 14:49:21 +02:00
bcm_kona_timer.c clocksource/drivers/bcm_kona: Convert to SPDX identifier 2022-05-18 11:08:59 +02:00
bcm2835_timer.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
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 timekeeping, clocksource: Fix various typos in comments 2021-03-22 23:06:48 +01:00
clps711x-timer.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
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/drivers/dw_apb_timer_of: Fix probe failure 2021-12-10 17:46:54 +01:00
dw_apb_timer.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
em_sti.c clocksource: remove MODULE_LICENSE in non-modules 2023-04-13 13:13:51 -07:00
exynos_mct.c clocksource/drivers/exynos_mct: Fixed a spelling error 2025-03-07 17:55:59 +01:00
hyperv_timer.c clocksource/hyperv: Implement read_snapshot() for TSC page clocksource 2026-06-05 14:25:03 +02:00
i8253.c clocksource/i8253: Use raw_spinlock_irqsave() in clockevent_i8253_disable() 2025-05-05 15:34:49 +02:00
ingenic-ost.c clocksource/drivers/ingenic: Use devm_clk_get_enabled() helpers 2024-09-06 14:49:20 +02:00
ingenic-sysost.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
ingenic-timer.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
jcore-pit.c irqchip/jcore-aic, clocksource/drivers/jcore: Fix jcore-pit interrupt request 2025-02-17 23:27:49 +01:00
Kconfig clocksource: move NXP timer selection to drivers/clocksource 2026-06-10 07:26:07 +02:00
Makefile clocksource/drivers: Add Realtek system timer driver 2025-11-26 11:25:15 +01:00
mips-gic-timer.c clocksource/drivers/mips-gic-timer: Only use VDSO_CLOCKMODE_GIC when it is a available 2026-06-09 17:02:10 +02:00
mmio.c clocksource/drivers/mmio: Make the code compatible with modules 2026-04-03 10:52:05 +02:00
mps2-timer.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
mxs_timer.c clocksource/drivers/mxs_timer: Add missing semicolon when DEBUG is defined 2021-01-18 22:28:59 +01:00
nomadik-mtu.c clocksource: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
numachip.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
renesas-ostm.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
samsung_pwm_timer.c of: remove internal arguments from of_property_for_each_u32() 2024-07-25 06:53:47 -05:00
scx200_hrt.c clocksource/drivers/scx200: Add module owner 2025-09-23 10:21:24 +02:00
sh_cmt.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
sh_mtu2.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
sh_tmu.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
timer-armada-370-xp.c clocksource/drivers/armada-370-xp: Fix dead link to timer binding 2026-01-20 18:06:45 +01:00
timer-atmel-pit.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-atmel-st.c clocksource/drivers/atmel-st: Remove useless 'status' 2020-04-15 10:57:15 +02:00
timer-atmel-tcb.c clocksource/drivers/timer-atmel-tcb: Fix initialization on SAM9 hardware 2023-10-13 12:56:50 +02:00
timer-cadence-ttc.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-clint.c riscv: Use IPIs for remote cache/TLB flushes by default 2024-04-29 10:49:26 -07:00
timer-cs5535.c clocksource/drivers/cs5535: Add module owner 2025-09-23 10:52:23 +02:00
timer-davinci.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-digicolor.c clocksource/drivers/digicolor: Convert to SPDX identifier 2022-05-18 11:08:59 +02:00
timer-econet-en751221.c clocksource/timer-econet-en751221: Convert comma to semicolon 2025-09-23 10:56:13 +02:00
timer-ep93xx.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-fsl-ftm.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-fttmr010.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-goldfish.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-gx6605s.c clocksource/drivers/timer-gx6605s: Fixup counter reload 2020-08-24 13:01:39 +02:00
timer-gxp.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-imx-gpt.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-imx-sysctr.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-imx-tpm.c clocksource/drivers/imx-tpm: Fix next event not taking effect sometime 2024-09-02 10:04:15 +02:00
timer-integrator-ap.c clocksource: Explicitly include correct DT includes 2023-08-28 13:30:57 -05:00
timer-ixp4xx.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-keystone.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
timer-loongson1-pwm.c clocksource/drivers/loongson1: Set variable ls1x_timer_lock storage-class-specifier to static 2023-08-18 12:13:03 +02:00
timer-lpc32xx.c clocksource/drivers/lpc32xx: Convert to SPDX identifier 2022-05-18 11:08:59 +02:00
timer-mediatek-cpux.c clocksource/drivers/timer-mediatek: Split out CPUXGPT timers 2023-04-24 16:56:13 +02:00
timer-mediatek.c clocksource/drivers/timer-mediatek: Split out CPUXGPT timers 2023-04-24 16:56:13 +02:00
timer-meson6.c clocksource: Replace setup_irq() by request_irq() 2020-02-27 12:15:24 +01:00
timer-microchip-pit64b.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
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-msc313e.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-npcm7xx.c clocksource/drivers/timer-npcm7xx: Enable timer 1 clock before use 2022-12-02 12:48:28 +01:00
timer-nxp-pit.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-nxp-stm.c clocksource/drivers/nxp-stm: Prevent driver unbind 2025-11-26 11:25:03 +01:00
timer-of.c clocksource/drivers/timer-of: Make the code compatible with modules 2026-04-03 10:53:29 +02:00
timer-of.h clocksource/drivers/timer-of: Make the code compatible with modules 2026-04-03 10:53:29 +02:00
timer-orion.c arm: Handle KCOV __init vs inline mismatches 2025-07-21 21:43:39 -07:00
timer-owl.c clocksource/drivers/owl: Improve owl_timer_init fail messages 2020-02-27 09:42:00 +01:00
timer-pistachio.c clocksource/drivers/pistachio: Convert to SPDX identifier 2022-05-18 11:08:59 +02:00
timer-probe.c treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
timer-pxa.c clocksource: Replace setup_irq() by request_irq() 2020-02-27 12:15:24 +01:00
timer-qcom.c clocksource/drivers/qcom: Remove clockevents shutdown call on offlining 2024-10-31 10:41:43 +01:00
timer-ralink.c clocksource/drivers/ralink: Fix resource leaks in init error path 2025-11-26 11:24:34 +01:00
timer-rda.c clocksource/drivers/rda: Add sched_clock_register for RDA8810PL SoC 2025-11-26 11:25:11 +01:00
timer-realtek.c clocksource/drivers: Add Realtek system timer driver 2025-11-26 11:25:15 +01:00
timer-riscv.c riscv: clocksource: Fix stimecmp update hazard on RV32 2026-01-14 17:42:46 -07:00
timer-rockchip.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-rtl-otto.c clocksource/drivers/timer-rtl-otto: Make rttm_cs variable static 2026-03-24 18:30:29 +01:00
timer-sp.h clocksource/drivers/sp804: Enable Hisilicon sp804 timer 64bit mode 2020-09-24 10:51:04 +02:00
timer-sp804.c clocksource/drivers/timer-sp804: Fix an Oops when read_current_timer is called on ARM32 platforms where the SP804 is not registered as the sched_clock. 2026-01-20 18:06:54 +01:00
timer-sprd.c clocksource/drivers/sprd: Enable register for timer counter from 32 bit to 64 bit 2025-11-26 11:24:26 +01:00
timer-stm32-lp.c clocksource/drivers/stm32-lp: Drop unused module alias 2025-11-26 11:25:15 +01:00
timer-stm32.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
timer-sun4i.c clocksource/drivers/timer-sun4i: Add CLOCK_EVT_FEAT_DYNIRQ 2023-02-13 13:10:17 +01:00
timer-sun5i.c clocksource/drivers/sun5i: Add D1 hstimer support 2026-05-06 13:05:59 +02:00
timer-tegra.c clocksource/drivers/timer-tegra: Remove clockevents shutdown call on offlining 2024-10-31 10:41:43 +01:00
timer-tegra186.c clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog 2026-06-10 07:25:54 +02:00
timer-ti-32k.c clocksource/drivers/ti-32K: Fix misuse of "/**" comment 2024-01-22 13:16:32 +01:00
timer-ti-dm-systimer.c clocksource/drivers/timer-ti-dm: Fix property name in comment 2026-06-03 10:05:29 +02:00
timer-ti-dm.c clocksource/drivers/timer-ti-dm: Add clockevent support 2026-06-03 10:06:02 +02:00
timer-versatile.c clocksource/drivers/timer-versatile: Clear OF_POPULATED flag 2020-05-23 00:03:25 +02:00
timer-vt8500.c clocksource: Replace setup_irq() by request_irq() 2020-02-27 12:15:24 +01:00
timer-zevio.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00