linux-kernel - Re: [PATCH v5 15/15] USB: typec: Do not check VID for tps25750

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Date:   Mon, 18 Sep 2023 16:29:43 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Abdel Alkuor <alkuor@...il.com>
Cc:     krzysztof.kozlowski+dt@...aro.org, bryan.odonoghue@...aro.org,
        gregkh@...uxfoundation.org, robh+dt@...nel.org,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        conor+dt@...nel.org, linux-kernel@...r.kernel.org,
        abdelalkuor@...tab.com
Subject: Re: [PATCH v5 15/15] USB: typec: Do not check VID for tps25750

Hi,

On Sun, Sep 17, 2023 at 11:26:39AM -0400, Abdel Alkuor wrote:
> From: Abdel Alkuor <abdelalkuor@...tab.com>
> 
> tps25750 doesn't have VID register, check VID for PD controllers
> other than tps25750
> 
> Signed-off-by: Abdel Alkuor <abdelalkuor@...tab.com>
> ---
>  drivers/usb/typec/tipd/core.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 326c23bfa8e6..c1399e12a170 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -1142,10 +1142,6 @@ static int tps6598x_probe(struct i2c_client *client)
>  	if (IS_ERR(tps->regmap))
>  		return PTR_ERR(tps->regmap);
>  
> -	ret = tps6598x_read32(tps, TPS_REG_VID, &vid);
> -	if (ret < 0 || !vid)
> -		return -ENODEV;
> -
>  	/*
>  	 * Checking can the adapter handle SMBus protocol. If it can not, the
>  	 * driver needs to take care of block reads separately.
> @@ -1176,6 +1172,12 @@ static int tps6598x_probe(struct i2c_client *client)
>  
>  	tps->irq_handler = irq_handler;
>  
> +	if (!tps->is_tps25750) {
> +		ret = tps6598x_read32(tps, TPS_REG_VID, &vid);
> +		if (ret < 0 || !vid)
> +			return -ENODEV;
> +	}

You need to do this at the same time you enable tps25750, so I'm
guessing in patch 4.

You are also changing the execution order just because of that
is_tps25750. Instead you need to make sure you have that flag set as
soon as possible in the first place, so right after "tps" is
allocated:

        mutex_init(&tps->lock);
        tps->dev = &client->dev;
+       tps->is_tps25750 = of_device_is_compatible(np, "ti,tps25750");
 
        tps->regmap = devm_regmap_init_i2c(client, &tps6598x_regmap_config);
        if (IS_ERR(tps->regmap))


thanks,

-- 
heikki