The iGPU / GFX0 device's _PS0 method on the ASUS T200TA depends on the I2C1 controller (which is connected to the embedded controller). But unlike in the T100TA/T100CHI this dependency is not listed in the _DEP of the GFX0 device.
This results in the dev_WARN_ONCE(..., "Transfer while suspended\n") call in i2c-designware-master.c triggering and the AML code not working as it should.
This commit fixes this by adding a dmi based quirk mechanism for devices which miss a _DEP, and adding a quirk for the LNXVIDEO depending on the I2C1 device on the Asus T200TA.
Cc: stable@vger.kernel.org Fixes: 2d71ee0ce72f ("ACPI / LPSS: Add a device link from the GPU to the BYT I2C5 controller") Signed-off-by: Hans de Goede hdegoede@redhat.com --- Changes in v2: -Add Fixes: tag
Changes in v3: -Point Fixes tag to a more apropriate commit --- drivers/acpi/acpi_lpss.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index cd8cf3333f04..751ed38f2a10 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -10,6 +10,7 @@ #include <linux/acpi.h> #include <linux/clkdev.h> #include <linux/clk-provider.h> +#include <linux/dmi.h> #include <linux/err.h> #include <linux/io.h> #include <linux/mutex.h> @@ -463,6 +464,18 @@ struct lpss_device_links { const char *consumer_hid; const char *consumer_uid; u32 flags; + const struct dmi_system_id *dep_missing_ids; +}; + +/* Please keep this list sorted alphabetically by vendor and model */ +static const struct dmi_system_id i2c1_dep_missing_dmi_ids[] = { + { + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), + DMI_MATCH(DMI_PRODUCT_NAME, "T200TA"), + }, + }, + {} };
/* @@ -478,7 +491,8 @@ static const struct lpss_device_links lpss_device_links[] = { /* CHT iGPU depends on PMIC I2C controller */ {"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, /* BYT iGPU depends on the Embedded Controller I2C controller (UID 1) */ - {"80860F41", "1", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, + {"80860F41", "1", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME, + i2c1_dep_missing_dmi_ids}, /* BYT CR iGPU depends on PMIC I2C controller (UID 5 on CR) */ {"80860F41", "5", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, /* BYT iGPU depends on PMIC I2C controller (UID 7 on non CR) */ @@ -577,7 +591,8 @@ static void acpi_lpss_link_consumer(struct device *dev1, if (!dev2) return;
- if (acpi_lpss_dep(ACPI_COMPANION(dev2), ACPI_HANDLE(dev1))) + if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids)) + || acpi_lpss_dep(ACPI_COMPANION(dev2), ACPI_HANDLE(dev1))) device_link_add(dev2, dev1, link->flags);
put_device(dev2); @@ -592,7 +607,8 @@ static void acpi_lpss_link_supplier(struct device *dev1, if (!dev2) return;
- if (acpi_lpss_dep(ACPI_COMPANION(dev1), ACPI_HANDLE(dev2))) + if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids)) + || acpi_lpss_dep(ACPI_COMPANION(dev1), ACPI_HANDLE(dev2))) device_link_add(dev1, dev2, link->flags);
put_device(dev2);