From bd0f4e342e006366a7f4e77f8d01e42c2e8ca992 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sun, 23 Sep 2018 15:58:09 +0200 Subject: [PATCH] ACPI / LPSS: Add a device link from the GPU to the CHT I2C7 controller On some Cherry Trail systems the GPU ACPI fwnode has power-resources which point to the PMIC, which is connected over the LPSS I2C7 controller. Due to probe ordering currently we resume the GPU and thus try to access the ACPI power-resources before the I2C controller has been resumed. This leads to the following errors: i2c_designware 808622C1:06: controller timed out ACPI Error: AE_ERROR, Returned by Handler for [UserDefinedRegion] ACPI Error: Method parse/execution failed \_SB.P18W._ON, AE_ERROR video LNXVIDEO:00: Failed to change power state to D0 This commit adds a RPM consumer link from the GPU (which has a LNXVIDEO HID) to the CHT LPSS I2C7 controller, so that the I2C controller gets resumed before the GPU is resumed. Tested-by: Jarkko Nikula Signed-off-by: Hans de Goede Reviewed-by: Andy Shevchenko Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpi_lpss.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index 859b5b3dcdbf..fe37fd67331d 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -472,6 +472,7 @@ struct lpss_device_links { */ static const struct lpss_device_links lpss_device_links[] = { {"808622C1", "7", "80860F14", "3", DL_FLAG_PM_RUNTIME}, + {"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, }; static bool hid_uid_match(struct acpi_device *adev, -- 2.11.4.GIT