Re: [PATCH v3 4/5] i2c: nvidia-gpu: resume ccgx i2c client

[Wolfram Sang <wsa@the-dreams.de>]

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On Wed, May 22, 2019 at 11:31:41AM -0700, Ajay Gupta wrote:
> From: Ajay Gupta <ajayg@nvidia.com>
> 
> 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@nvidia.com>

Can't say if this is a valid workaround but here is my ack for modifying
the I2C realm:

Acked-by: Wolfram Sang <wsa@the-dreams.de>


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