linux-kernel - Re: [PATCH v10 2/4] Input: add core support for Goodix Berlin Touchscreen IC

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Date:   Thu, 2 Nov 2023 11:32:13 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Jeff LaBundy <jeff@...undy.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bastien Nocera <hadess@...ess.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Henrik Rydberg <rydberg@...math.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 2/4] Input: add core support for Goodix Berlin
 Touchscreen IC

Hi Jeff,

On 26/10/2023 07:05, Jeff LaBundy wrote:
> Hi Neil,
> 
> On Mon, Oct 23, 2023 at 05:03:46PM +0200, Neil Armstrong wrote:
> 
> [...]
> 
>> +static int goodix_berlin_get_ic_info(struct goodix_berlin_core *cd)
>> +{
>> +	__le16 length_raw;
>> +	u8 *afe_data;
>> +	u16 length;
>> +	int error;
>> +
>> +	afe_data = kzalloc(GOODIX_BERLIN_IC_INFO_MAX_LEN, GFP_KERNEL);
>> +	if (!afe_data)
>> +		return -ENOMEM;
>> +
>> +	error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
>> +				&length_raw, sizeof(length_raw));
>> +	if (error) {
>> +		dev_info(cd->dev, "failed get ic info length, %d\n", error);
> 
> This should be dev_err().

Ack

> 
>> +		goto free_afe_data;
>> +	}
>> +
>> +	length = le16_to_cpu(length_raw);
>> +	if (length >= GOODIX_BERLIN_IC_INFO_MAX_LEN) {
>> +		dev_info(cd->dev, "invalid ic info length %d\n", length);
> 
> And here.

Ack

> 
>> +		error = -EINVAL;
>> +		goto free_afe_data;
>> +	}
>> +
>> +	error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
>> +				afe_data, length);
>> +	if (error) {
>> +		dev_info(cd->dev, "failed get ic info data, %d\n", error);
>> +		return error;
>> +		goto free_afe_data;
>> +	}
> 
> This return statement is left over from v9; the print should also be dev_err().

Ack

> 
>> +
>> +	/* check whether the data is valid (ex. bus default values) */
>> +	if (goodix_berlin_is_dummy_data(cd, afe_data, length)) {
>> +		dev_err(cd->dev, "fw info data invalid\n");
>> +		error = -EINVAL;
>> +		goto free_afe_data;
>> +	}
>> +
>> +	if (!goodix_berlin_checksum_valid(afe_data, length)) {
>> +		dev_info(cd->dev, "fw info checksum error\n");
> 
> And here.

Ack

> 
>> +		error = -EINVAL;
>> +		goto free_afe_data;
>> +	}
>> +
>> +	error = goodix_berlin_convert_ic_info(cd, afe_data, length);
>> +	if (error)
>> +		goto free_afe_data;
>> +
>> +	/* check some key info */
>> +	if (!cd->touch_data_addr) {
>> +		dev_err(cd->dev, "touch_data_addr is null\n");
>> +		error = -EINVAL;
>> +		goto free_afe_data;
>> +	}
>> +
>> +	return 0;
>> +
>> +free_afe_data:
>> +	kfree(afe_data);
>> +
>> +	return error;
>> +}
> 
> [...]
> 
>> +static int goodix_berlin_request_handle_reset(struct goodix_berlin_core *cd)
>> +{
>> +	gpiod_set_value(cd->reset_gpio, 1);
>> +	usleep_range(2000, 2100);
>> +	gpiod_set_value(cd->reset_gpio, 0);
> 
> I see that now, this function is only called if the reset GPIO is defined,
> but there used to be another msleep() here that has since been dropped. Is
> that intentional?

Indeed, it was dropped, I'll add it back thx for noticing !

> 
>> +
>> +	return 0;
>> +}
> 
> Kind regards,
> Jeff LaBundy

Thanks,
Neil