On Sun, 03 Jan 2021, Jeff LaBundy wrote: > After a reset event, the device automatically triggers ATI at the > default core clock frequency (16 MHz). Soon afterward, the driver > loads firmware which may attempt to lower the frequency. > > If this initial ATI cycle is still in progress when the frequency > is changed, however, the device incorrectly reports channels 0, 1 > and 2 to be in a state of touch once ATI finally completes. > > To solve this problem, wait until ATI is complete before lowering > the frequency. Because this particular ATI cycle occurs following > a reset event, its duration is predictable and a simple delay can > suffice. > > Signed-off-by: Jeff LaBundy <[email protected]> > --- > drivers/mfd/iqs62x.c | 9 +++++++++ > 1 file changed, 9 insertions(+)
For my own reference (apply this as-is to your sign-off block): Acked-for-MFD-by: Lee Jones <[email protected]> -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
