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| author | Hans de Goede <hdegoede@redhat.com> | 2018-04-26 15:10:23 +0300 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2018-06-06 11:00:39 +0300 |
| commit | 1d375b58c12f08d8570b30b865def4734517f04f (patch) | |
| tree | 9e515a630a8cbc88b57bf5e1fa789e83ad347ff2 /drivers/pwm/pwm-lpss-platform.c | |
| parent | 692099cdcf275df272936b31c8409f2a5a1f7239 (diff) | |
| download | linux-1d375b58c12f08d8570b30b865def4734517f04f.tar.xz | |
pwm: lpss: platform: Save/restore the ctrl register over a suspend/resume
On some devices the contents of the ctrl register get lost over a
suspend/resume and the PWM comes back up disabled after the resume.
This is seen on some Bay Trail devices with the PWM in ACPI enumerated
mode, so it shows up as a platform device instead of a PCI device.
If we still think it is enabled and then try to change the duty-cycle
after this, we end up with a "PWM_SW_UPDATE was not cleared" error and
the PWM is stuck in that state from then on.
This commit adds suspend and resume pm callbacks to the pwm-lpss-platform
code, which save/restore the ctrl register over a suspend/resume, fixing
this.
Note that:
1) There is no need to do this over a runtime suspend, since we
only runtime suspend when disabled and then we properly set the enable
bit and reprogram the timings when we re-enable the PWM.
2) This may be happening on more systems then we realize, but has been
covered up sofar by a bug in the acpi-lpss.c code which was save/restoring
the regular device registers instead of the lpss private registers due to
lpss_device_desc.prv_offset not being set. This is fixed by a later patch
in this series.
Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/pwm-lpss-platform.c')
| -rw-r--r-- | drivers/pwm/pwm-lpss-platform.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-lpss-platform.c b/drivers/pwm/pwm-lpss-platform.c index 5d6ed1507d29..5561b9e190f8 100644 --- a/drivers/pwm/pwm-lpss-platform.c +++ b/drivers/pwm/pwm-lpss-platform.c @@ -74,6 +74,10 @@ static int pwm_lpss_remove_platform(struct platform_device *pdev) return pwm_lpss_remove(lpwm); } +static SIMPLE_DEV_PM_OPS(pwm_lpss_platform_pm_ops, + pwm_lpss_suspend, + pwm_lpss_resume); + static const struct acpi_device_id pwm_lpss_acpi_match[] = { { "80860F09", (unsigned long)&pwm_lpss_byt_info }, { "80862288", (unsigned long)&pwm_lpss_bsw_info }, @@ -86,6 +90,7 @@ static struct platform_driver pwm_lpss_driver_platform = { .driver = { .name = "pwm-lpss", .acpi_match_table = pwm_lpss_acpi_match, + .pm = &pwm_lpss_platform_pm_ops, }, .probe = pwm_lpss_probe_platform, .remove = pwm_lpss_remove_platform, |