On Fri, 2020-02-21 at 17:47 +0100, Hans de Goede wrote: > On most Bay Trail (x86, UEFI + ACPI) devices the ACPI tables do not > have > a _DSD with a "daffd814-6eba-4d8c-8a91-bc9bbf4aa301" UUID, adding > "irq-gpios" and "reset-gpios" mappings, so we cannot get the GPIOS by > name > without first manually adding mappings ourselves. > > These devices contain 2 GpioIo resource in their _CRS table, on all 4 > such > devices which I have access to, the order of the 2 GPIOs is reset, > int. > > Note that the GPIO to which the touchscreen controller irq pin is > connected > is configured in direct-irq mode on these Bay Trail devices, the > pinctrl-baytrail.c driver still allows controlling the pin as a GPIO > in > this case, but this is not necessarily the case on other X86 ACPI > platforms, nor do we have a guarantee that the GPIO order is the same > elsewhere, so we limit the use of a _CRS table with 2 GpioIo > resources > to Bay Trail devices only. > > BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1786317 > BugLink: https://github.com/nexus511/gpd-ubuntu-packages/issues/10 > BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=199207 > Cc: Dmitry Mastykin <mastichi@xxxxxxxxx> > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> This is gross, but... Reviewed-by: Bastien Nocera <hadess@xxxxxxxxxx> > --- > drivers/input/touchscreen/goodix.c | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/drivers/input/touchscreen/goodix.c > b/drivers/input/touchscreen/goodix.c > index 9de2f325ac6e..d178aa33b529 100644 > --- a/drivers/input/touchscreen/goodix.c > +++ b/drivers/input/touchscreen/goodix.c > @@ -610,6 +610,21 @@ static int goodix_reset(struct goodix_ts_data > *ts) > } > > #if defined CONFIG_X86 && defined CONFIG_ACPI > +#include <asm/cpu_device_id.h> > +#include <asm/intel-family.h> > + > +static const struct x86_cpu_id baytrail_cpu_ids[] = { > + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT, > X86_FEATURE_ANY, }, > + {} > +}; > + > +static inline bool is_byt(void) > +{ > + const struct x86_cpu_id *id = x86_match_cpu(baytrail_cpu_ids); > + > + return !!id; > +} > + > static const struct acpi_gpio_params first_gpio = { 0, 0, false }; > static const struct acpi_gpio_params second_gpio = { 1, 0, false }; > > @@ -675,6 +690,10 @@ static int goodix_add_acpi_gpio_mappings(struct > goodix_ts_data *ts) > } else if (ts->gpio_count == 2 && ts->gpio_int_idx == 1) { > ts->irq_pin_access_method = irq_pin_access_acpi_gpio; > gpio_mapping = acpi_goodix_int_last_gpios; > + } else if (is_byt() && ts->gpio_count == 2 && ts->gpio_int_idx > == -1) { > + dev_info(dev, "No ACPI GpioInt resource, assuming that > the GPIO order is reset, int\n"); > + ts->irq_pin_access_method = irq_pin_access_acpi_gpio; > + gpio_mapping = acpi_goodix_int_last_gpios; > } else { > dev_warn(dev, "Unexpected ACPI resources: gpio_count > %d, gpio_int_idx %d\n", > ts->gpio_count, ts->gpio_int_idx);
