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authorHans de Goede <hdegoede@redhat.com>2018-04-26 14:10:24 +0200
committerThierry Reding <thierry.reding@gmail.com>2018-06-06 10:01:18 +0200
commitfdcb613d49321b5bf5d5a1bd0fba8e7c241dcc70 (patch)
tree1d4a1196290518d2f3525aedba2f2aea917bfdbc /drivers/acpi/acpi_lpss.c
parent1d375b58c12f08d8570b30b865def4734517f04f (diff)
downloadlinux-fdcb613d49321b5bf5d5a1bd0fba8e7c241dcc70.tar.bz2
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/acpi_lpss.c')
-rw-r--r--drivers/acpi/acpi_lpss.c2
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,
};