linux-kernel - Re: [PATCH] usb: typec: fsa4480: Relax CHIP

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Message-ID: <ZsM9BkcaxV3qdWNs@kuha.fi.intel.com>
Date: Mon, 19 Aug 2024 15:39:34 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Caleb Connolly <caleb.connolly@...aro.org>,
	~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] usb: typec: fsa4480: Relax CHIP_ID check

On Sun, Aug 18, 2024 at 10:21:01PM +0200, Luca Weiss wrote:
> Some FSA4480-compatible chips like the OCP96011 used on Fairphone 5
> return 0x00 from the CHIP_ID register. Handle that gracefully and only
> fail probe when the I2C read has failed.
> 
> With this the dev_dbg will print 0 but otherwise continue working.
> 
>   [    0.251581] fsa4480 1-0042: Found FSA4480 v0.0 (Vendor ID = 0)
> 
> Cc: stable@...r.kernel.org
> Fixes: e885f5f1f2b4 ("usb: typec: fsa4480: Check if the chip is really there")
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/mux/fsa4480.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/mux/fsa4480.c b/drivers/usb/typec/mux/fsa4480.c
> index cd235339834b..f71dba8bf07c 100644
> --- a/drivers/usb/typec/mux/fsa4480.c
> +++ b/drivers/usb/typec/mux/fsa4480.c
> @@ -274,7 +274,7 @@ static int fsa4480_probe(struct i2c_client *client)
>  		return dev_err_probe(dev, PTR_ERR(fsa->regmap), "failed to initialize regmap\n");
>  
>  	ret = regmap_read(fsa->regmap, FSA4480_DEVICE_ID, &val);
> -	if (ret || !val)
> +	if (ret)
>  		return dev_err_probe(dev, -ENODEV, "FSA4480 not found\n");
>  
>  	dev_dbg(dev, "Found FSA4480 v%lu.%lu (Vendor ID = %lu)\n",
> 
> ---
> base-commit: ccdbf91fdf5a71881ef32b41797382c4edd6f670
> change-id: 20240818-fsa4480-chipid-fix-2c7cf5810135
> 
> Best regards,
> -- 
> Luca Weiss <luca.weiss@...rphone.com>

-- 
heikki