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

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Message-ID: <ZTnzorJ4h1zva1AZ@nixie71>
Date:   Thu, 26 Oct 2023 00:05:38 -0500
From:   Jeff LaBundy <jeff@...undy.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>
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 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().

> +		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.

> +		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().

> +
> +	/* 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.

> +		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?

> +
> +	return 0;
> +}

Kind regards,
Jeff LaBundy