Re: [PATCH] usb: typec: ucsi_ccg: Don't probe GPUs without a CCGx controller

[sashiko-bot@kernel.org]

> The NVIDIA GPU I2C driver adds a ccgx-ucsi client on every GPU, but
> GPUs without a USB Type-C port, such as the GTX 1660 Ti, have no CCGx
> controller, and every probe fails with:
> 
>   ucsi_ccg 4-0008: i2c_transfer failed -110
>   ucsi_ccg 4-0008: ucsi_ccg_init failed - -110
>   ucsi_ccg 4-0008: probe with driver ucsi_ccg failed with error -110
> 
> Fix this by reading DEVICE_MODE first for clients created by the GPU
> driver, and returning -ENODEV if the read times out. Controllers
> described by firmware are not affected.
> 
> Tested on an ASUS TUF Gaming A17 (FA706IU, GTX 1660 Ti): the three
> errors are gone, probe takes the same time (one timed-out transfer, as
> before), and the platform's own UCSI port and suspend/resume are not
> affected.
> 
> Assisted by LLM.
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=206653
> Link: https://lore.kernel.org/all/20200922054338.GA588161@kroah.com/
> Signed-off-by: Hex Lindqvist <hex@freenixos.com>

Sashiko has reviewed this patch and found no issues.

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