On Thu, Oct 24, 2019 at 11:57 PM Hans de Goede <hdegoede@xxxxxxxxxx> wrote:
>
> 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@xxxxxxxxxxxxxxx
> Fixes: 2d71ee0ce72f ("ACPI / LPSS: Add a device link from the GPU to the BYT I2C5 controller")
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> 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);
> --
Applying the series as 5.5 material, thanks!
