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| author | Hans de Goede <hdegoede@redhat.com> | 2018-04-26 14:10:24 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2018-06-06 10:01:18 +0200 |
| commit | fdcb613d49321b5bf5d5a1bd0fba8e7c241dcc70 (patch) | |
| tree | 1d4a1196290518d2f3525aedba2f2aea917bfdbc /drivers/acpi | |
| parent | pwm: lpss: platform: Save/restore the ctrl register over a suspend/resume (diff) | |
| download | linux-fdcb613d49321b5bf5d5a1bd0fba8e7c241dcc70.tar.xz linux-fdcb613d49321b5bf5d5a1bd0fba8e7c241dcc70.zip | |
ACPI / LPSS: Add missing prv_offset setting for byt/cht PWM devices
The LPSS PWM device on on Bay Trail and Cherry Trail devices has a set
of private registers at offset 0x800, the current lpss_device_desc for
them already sets the LPSS_SAVE_CTX flag to have these saved/restored
over device-suspend, but the current lpss_device_desc was not setting
the prv_offset field, leading to the regular device registers getting
saved/restored instead.
This is causing the PWM controller to no longer work, resulting in a black
screen, after a suspend/resume on systems where the firmware clears the
APB clock and reset bits at offset 0x804.
This commit fixes this by properly setting prv_offset to 0x800 for
the PWM devices.
Cc: stable@vger.kernel.org
Fixes: e1c748179754 ("ACPI / LPSS: Add Intel BayTrail ACPI mode PWM")
Fixes: 1bfbd8eb8a7f ("ACPI / LPSS: Add ACPI IDs for Intel Braswell")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rafael J . Wysocki <rjw@rjwysocki.net>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/acpi_lpss.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index 2bcffec8dbf0..c4ba9164e582 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -229,11 +229,13 @@ static const struct lpss_device_desc lpt_sdio_dev_desc = { static const struct lpss_device_desc byt_pwm_dev_desc = { .flags = LPSS_SAVE_CTX, + .prv_offset = 0x800, .setup = byt_pwm_setup, }; static const struct lpss_device_desc bsw_pwm_dev_desc = { .flags = LPSS_SAVE_CTX | LPSS_NO_D3_DELAY, + .prv_offset = 0x800, .setup = bsw_pwm_setup, }; |