linux-kernel - Re: [PATCH v4 1/7] iio: pressure: bmp280: Use bulk read for humidity calibration data

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Message-ID: <ZtBkNu0luJyT1emw@smile.fi.intel.com>
Date: Thu, 29 Aug 2024 15:06:14 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Vasileios Amoiridis <vassilisamir@...il.com>
Cc: jic23@...nel.org, lars@...afoo.de, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, ang.iglesiasg@...il.com,
	linus.walleij@...aro.org, biju.das.jz@...renesas.com,
	javier.carrasco.cruz@...il.com, semen.protsenko@...aro.org,
	579lpy@...il.com, ak@...klinger.de, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	christophe.jaillet@...adoo.fr
Subject: Re: [PATCH v4 1/7] iio: pressure: bmp280: Use bulk read for humidity
 calibration data

On Wed, Aug 28, 2024 at 10:51:21PM +0200, Vasileios Amoiridis wrote:
> Convert individual reads to a bulk read for the humidity calibration data.

...

> +	calib->H2 = get_unaligned_le16(&data->bme280_humid_cal_buf[H2]);
> +	calib->H3 = data->bme280_humid_cal_buf[H3];
> +	tmp_1 = get_unaligned_be16(&data->bme280_humid_cal_buf[H4]);
> +	tmp_2 = FIELD_GET(BME280_COMP_H4_GET_MASK_UP, tmp_1);
> +	h4_upper = FIELD_PREP(BME280_COMP_H4_PREP_MASK_UP, tmp_2);
> +	h4_lower = FIELD_GET(BME280_COMP_H4_MASK_LOW,

> +			get_unaligned_be16(&data->bme280_humid_cal_buf[H4]));

Either I don't understand the side effects, or this is the same as tmp_1. No?

> +	calib->H4 = sign_extend32(h4_upper | h4_lower, 11);
> +	calib->H5 = sign_extend32(FIELD_GET(BME280_COMP_H5_MASK,
> +			get_unaligned_le16(&data->bme280_humid_cal_buf[H5])), 11);
> +	calib->H6 = data->bme280_humid_cal_buf[H6];

-- 
With Best Regards,
Andy Shevchenko