• Ajay Gupta's avatar
    i2c: nvidia-gpu: resume ccgx i2c client · 9f2e244d
    Ajay Gupta authored
    
    
    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: default avatarAjay Gupta <ajayg@nvidia.com>
    Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
    9f2e244d
i2c-nvidia-gpu.c 10.3 KB