On Sun, 17 Jan 2021, Jeff LaBundy wrote: > After loading firmware, the driver triggers ATI (calibration) with > the newly loaded register configuration in place. Next, the driver > polls a register field to ensure ATI completed in a timely fashion > and that the device is ready to sense. > > However, communicating with the device over I2C while ATI is under- > way may induce noise in the device and cause ATI to fail. As such, > the vendor recommends not to poll the device during ATI. > > To solve this problem, let the device naturally signal to the host > that ATI is complete by way of an interrupt. A completion prevents > the sub-devices from being registered until this happens. > > The former logic that scaled ATI timeout and filter settling delay > is not carried forward with the new implementation, as it produces > overly conservative delays at lower clock rates. Instead, a single > pair of delays that covers all cases is used. > > Signed-off-by: Jeff LaBundy <[email protected]> > --- > Changes in v2: > - Removed superfluous newlines throughout all iqs62x_dev_desc structs > > drivers/mfd/iqs62x.c | 125 > +++++++++++++++++++++++++-------------------- > include/linux/mfd/iqs62x.h | 11 ++-- > 2 files changed, 73 insertions(+), 63 deletions(-)
Applied, thanks. -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
