On Thu, Jan 11, 2018 at 06:24:07PM +0100, Hans de Goede wrote: > We should not try to do any i2c transfers before the controller is > resumed (which happens before our resume method gets called). > > So we need to disable our IRQ while suspended to enforce this. The > code paths for devices with GPIOs for the int and reset pins already > disable the IRQ the through goodix_free_irq(). > > This commit also disables the IRQ while suspended for devices without > GPIOs for the int and reset pins. > > This fixes the i2c bus sometimes getting stuck after a suspend/resume > causing the touchscreen to sometimes not work after a suspend/resume. > This has been tested on a GPD pocked device. > > BugLink: https://github.com/nexus511/gpd-ubuntu-packages/issues/10 > BugLink: https://www.reddit.com/r/GPDPocket/comments/7niut2/fix_for_broken_touch_after_resume_all_linux/ > Tested-by: Hans de Goede <hdegoede@xxxxxxxxxx> > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> > Reviewed-by: Bastien Nocera <hadess@xxxxxxxxxx> Applied, thank you. > --- > Changes in v2: > -Mention the problems this fix + devices tested on in commit msg > -Add BugLinks and Tested-by to commit msg > > Changes in v3: > -Fix typo in commit msg > -Add Bastien's Reviewed-by > --- > drivers/input/touchscreen/goodix.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c > index 69d0b8cbc71f..ecec8eb17f28 100644 > --- a/drivers/input/touchscreen/goodix.c > +++ b/drivers/input/touchscreen/goodix.c > @@ -878,8 +878,10 @@ static int __maybe_unused goodix_suspend(struct device *dev) > int error; > > /* We need gpio pins to suspend/resume */ > - if (!ts->gpiod_int || !ts->gpiod_rst) > + if (!ts->gpiod_int || !ts->gpiod_rst) { > + disable_irq(client->irq); > return 0; > + } > > wait_for_completion(&ts->firmware_loading_complete); > > @@ -919,8 +921,10 @@ static int __maybe_unused goodix_resume(struct device *dev) > struct goodix_ts_data *ts = i2c_get_clientdata(client); > int error; > > - if (!ts->gpiod_int || !ts->gpiod_rst) > + if (!ts->gpiod_int || !ts->gpiod_rst) { > + enable_irq(client->irq); > return 0; > + } > > /* > * Exit sleep mode by outputting HIGH level to INT pin > -- > 2.14.3 > -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
