linux.git/drivers/clocksource, branch v5.12.5

clocksource/drivers/timer-ti-dm: Handle dra7 timer wrap errata i940

2021-05-19T08:56:42+00:00

commit 25de4ce5ed02994aea8bc111d133308f6fd62566 upstream.

There is a timer wrap issue on dra7 for the ARM architected timer.
In a typical clock configuration the timer fails to wrap after 388 days.

To work around the issue, we need to use timer-ti-dm percpu timers instead.

Let's configure dmtimer3 and 4 as percpu timers by default, and warn about
the issue if the dtb is not configured properly.

Let's do this as a single patch so it can be backported to v5.8 and later
kernels easily. Note that this patch depends on earlier timer-ti-dm
systimer posted mode fixes, and a preparatory clockevent patch
"clocksource/drivers/timer-ti-dm: Prepare to handle dra7 timer wrap issue".

For more information, please see the errata for "AM572x Sitara Processors
Silicon Revisions 1.1, 2.0":

https://www.ti.com/lit/er/sprz429m/sprz429m.pdf

The concept is based on earlier reference patches done by Tero Kristo and
Keerthy.

Cc: Keerthy 
Cc: Tero Kristo 
Signed-off-by: Tony Lindgren 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20210323074326.28302-3-tony@atomide.com
Signed-off-by: Greg Kroah-Hartman

clocksource/drivers/timer-ti-dm: Prepare to handle dra7 timer wrap issue

2021-05-19T08:56:42+00:00

commit 3efe7a878a11c13b5297057bfc1e5639ce1241ce upstream.

There is a timer wrap issue on dra7 for the ARM architected timer.
In a typical clock configuration the timer fails to wrap after 388 days.

To work around the issue, we need to use timer-ti-dm timers instead.

Let's prepare for adding support for percpu timers by adding a common
dmtimer_clkevt_init_common() and call it from dmtimer_clockevent_init().
This patch makes no intentional functional changes.

Signed-off-by: Tony Lindgren 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20210323074326.28302-2-tony@atomide.com
Signed-off-by: Greg Kroah-Hartman

clocksource/drivers/ingenic_ost: Fix return value check in ingenic_ost_probe()

2021-05-14T08:52:27+00:00

[ Upstream commit 2a65f7e2772613debd03fa2492e76a635aa04545 ]

In case of error, the function device_node_to_regmap() returns
ERR_PTR() and never returns NULL. The NULL test in the return
value check should be replaced with IS_ERR().

Fixes: ca7b72b5a5f2 ("clocksource: Add driver for the Ingenic JZ47xx OST")
Reported-by: Hulk Robot 
Signed-off-by: Wei Yongjun 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20210308123031.2285083-1-weiyongjun1@huawei.com
Signed-off-by: Sasha Levin

clocksource/drivers/timer-ti-dm: Add missing set_state_oneshot_stopped

2021-05-14T08:52:27+00:00

[ Upstream commit ac4daf737674b4d29e19b7c300caff3bcf7160d8 ]

To avoid spurious timer interrupts when KTIME_MAX is used, we need to
configure set_state_oneshot_stopped(). Although implementing this is
optional, it still affects things like power management for the extra
timer interrupt.

For more information, please see commit 8fff52fd5093 ("clockevents:
Introduce CLOCK_EVT_STATE_ONESHOT_STOPPED state") and commit cf8c5009ee37
("clockevents/drivers/arm_arch_timer: Implement
->set_state_oneshot_stopped()").

Fixes: 52762fbd1c47 ("clocksource/drivers/timer-ti-dm: Add clockevent and clocksource support")
Signed-off-by: Tony Lindgren 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20210304072135.52712-4-tony@atomide.com
Signed-off-by: Sasha Levin

clocksource/drivers/timer-ti-dm: Fix posted mode status check order

2021-05-14T08:52:27+00:00

[ Upstream commit 212709926c5493a566ca4086ad4f4b0d4e66b553 ]

When the timer is configured in posted mode, we need to check the write-
posted status register (TWPS) before writing to the register.

We now check TWPS after the write starting with commit 52762fbd1c47
("clocksource/drivers/timer-ti-dm: Add clockevent and clocksource
support").

For example, in the TRM for am571x the following is documented in chapter
"22.2.4.13.1.1 Write Posting Synchronization Mode":

"For each register, a status bit is provided in the timer write-posted
 status (TWPS) register. In this mode, it is mandatory that software check
 this status bit before any write access. If a write is attempted to a
 register with a previous access pending, the previous access is discarded
 without notice."

The regression happened when I updated the code to use standard read/write
accessors for the driver instead of using __omap_dm_timer_load_start().
We have__omap_dm_timer_load_start() check the TWPS status correctly using
__omap_dm_timer_write().

Fixes: 52762fbd1c47 ("clocksource/drivers/timer-ti-dm: Add clockevent and clocksource support")
Signed-off-by: Tony Lindgren 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20210304072135.52712-2-tony@atomide.com
Signed-off-by: Sasha Levin

clocksource/drivers/dw_apb_timer_of: Add handling for potential memory leak

2021-05-12T06:39:37+00:00

[ Upstream commit 397dc6f7ca3c858dc95800f299357311ccf679e6 ]

Add calls to disable the clock and unmap the timer base address in case
of any failures.

Reported-by: kernel test robot 
Reported-by: Dan Carpenter 
Signed-off-by: Dinh Nguyen 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20210322121844.2271041-1-dinguyen@kernel.org
Signed-off-by: Sasha Levin

Merge tag 'timers-urgent-2021-02-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2021-02-22T22:11:36+00:00

Pull timer fixes from Thomas Gleixner:
 "A small set of clockevent fixes which fell through the cracks before
  the 5.11 release:

   - Ensure a clock is enabled on sh_cmt

   - Trivial compile fail and compile warning fixes"

* tag 'timers-urgent-2021-02-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource/drivers/mxs_timer: Add missing semicolon when DEBUG is defined
  clocksource/drivers/sh_cmt: Make sure channel clock supply is enabled
  clocksource/drivers/ixp4xx: Select TIMER_OF when needed

Merge tag 'hyperv-next-signed-20210216' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

2021-02-21T21:24:39+00:00

Pull Hyper-V updates from Wei Liu:

 - VMBus hardening patches from Andrea Parri and Andres Beltran.

 - Patches to make Linux boot as the root partition on Microsoft
   Hypervisor from Wei Liu.

 - One patch to add a new sysfs interface to support hibernation on
   Hyper-V from Dexuan Cui.

 - Two miscellaneous clean-up patches from Colin and Gustavo.

* tag 'hyperv-next-signed-20210216' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: (31 commits)
  Revert "Drivers: hv: vmbus: Copy packets sent by Hyper-V out of the ring buffer"
  iommu/hyperv: setup an IO-APIC IRQ remapping domain for root partition
  x86/hyperv: implement an MSI domain for root partition
  asm-generic/hyperv: import data structures for mapping device interrupts
  asm-generic/hyperv: introduce hv_device_id and auxiliary structures
  asm-generic/hyperv: update hv_interrupt_entry
  asm-generic/hyperv: update hv_msi_entry
  x86/hyperv: implement and use hv_smp_prepare_cpus
  x86/hyperv: provide a bunch of helper functions
  ACPI / NUMA: add a stub function for node_to_pxm()
  x86/hyperv: handling hypercall page setup for root
  x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary
  x86/hyperv: allocate output arg pages if required
  clocksource/hyperv: use MSR-based access if running as root
  Drivers: hv: vmbus: skip VMBus initialization if Linux is root
  x86/hyperv: detect if Linux is the root partition
  asm-generic/hyperv: change HV_CPU_POWER_MANAGEMENT to HV_CPU_MANAGEMENT
  hv: hyperv.h: Replace one-element array with flexible-array in struct icmsg_negotiate
  hv_netvsc: Restrict configurations on isolated guests
  Drivers: hv: vmbus: Enforce 'VMBus version >= 5.2' on isolated guests
  ...

clocksource/hyperv: use MSR-based access if running as root

2021-02-11T08:47:06+00:00

When Linux runs as the root partition, the setup required for TSC page
is different. Luckily Linux also has access to the MSR based
clocksource. We can just disable the TSC page clocksource if Linux is
the root partition.

Signed-off-by: Wei Liu 
Acked-by: Daniel Lezcano 
Reviewed-by: Pavel Tatashin 
Reviewed-by: Michael Kelley 
Link: https://lore.kernel.org/r/20210203150435.27941-5-wei.liu@kernel.org

Merge tag 'timers-v5.12-rc1' of https://git.linaro.org/people/daniel.lezcano/linux into timers/core

2021-02-10T10:02:20+00:00

Pull clocksource/events updates from Daniel Lezcano:

 - Drop dead code on efm32 (Uwe Kleine-König)

 - Move pr_fmt() before the includes on davinci driver (Bartosz
   Golaszewski)

 - Clarified timer interrupt must be specified on nuvoton DT bindings
   (Jonathan Neuschäfer)

 - Remove tango, sirf, u300 and atlas timer drivers (Arnd Bergman)

 - Add suspend/resume on pit64b (Claudiu Beznea)

Link: https://lore.kernel.org/r/3747fbde-134f-5e1d-47d5-8776c1a52aa1@linaro.org