On Wed, May 22, 2019 at 11:31:41AM -0700, Ajay Gupta wrote: > From: Ajay Gupta <ajayg@xxxxxxxxxx> > > Cypress USB Type-C CCGx controller firmware version 3.1.10 > (which is being used in many NVIDIA GPU cards) has known issue of > not triggering interrupt when a USB device is hot plugged to runtime > resume the controller. If any GPU card gets latest kernel with runtime > pm support but does not get latest fixed firmware then also it should > continue to work and therefore a workaround is required to check for > any connector change event > > The workaround is to request runtime resume of i2c client > which is UCSI Cypress CCGx driver. CCG driver will call the ISR > for any connector change event only if NVIDIA GPU has old > CCG firmware with the known issue. > > Signed-off-by: Ajay Gupta <ajayg@xxxxxxxxxx> Can't say if this is a valid workaround but here is my ack for modifying the I2C realm: Acked-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
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