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Message-ID: <20240607161101.GA258325@vamoiridPC>
Date: Fri, 7 Jun 2024 18:11:01 +0200
From: Vasileios Amoiridis <vassilisamir@...il.com>
To: Vasileios Amoiridis <vassilisamir@...il.com>
Cc: jic23@...nel.org, dpfrey@...il.com, himanshujha199640@...il.com,
lars@...afoo.de, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org, mike.looijmans@...ic.nl
Subject: Re: [PATCH v2 13/19] iio: chemical: bme680: Add read buffers in DMA
safe region
On Thu, Jun 06, 2024 at 11:23:05PM +0200, Vasileios Amoiridis wrote:
> Move the buffers that are used in order to read data from the
> device in a DMA-safe region. Also create defines for the number
> of bytes that are being read from the device and don't use
> magic numbers.
>
Well this commit shouldn't have been here, I changed the title and
forgot to delete it from the folder...
Vasilis
> Signed-off-by: Vasileios Amoiridis <vassilisamir@...il.com>
> ---
> drivers/iio/chemical/bme680.h | 7 +++++
> drivers/iio/chemical/bme680_core.c | 45 +++++++++++++++---------------
> 2 files changed, 29 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/iio/chemical/bme680.h b/drivers/iio/chemical/bme680.h
> index 8d0f53c05d7d..7d0ff294725a 100644
> --- a/drivers/iio/chemical/bme680.h
> +++ b/drivers/iio/chemical/bme680.h
> @@ -56,6 +56,13 @@
> #define BME680_GAS_MEAS_BIT BIT(6)
> #define BME680_MEAS_BIT BIT(5)
>
> +#define BME680_TEMP_NUM_BYTES 3
> +#define BME680_PRESS_NUM_BYTES 3
> +#define BME680_HUMID_NUM_BYTES 2
> +#define BME680_GAS_NUM_BYTES 2
> +
> +#define BME680_MEAS_TRIM_MASK GENMASK(24, 4)
> +
> /* Calibration Parameters */
> #define BME680_T2_LSB_REG 0x8A
> #define BME680_H2_MSB_REG 0xE1
> diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
> index 538696ac4205..99259d0cf13d 100644
> --- a/drivers/iio/chemical/bme680_core.c
> +++ b/drivers/iio/chemical/bme680_core.c
> @@ -115,6 +115,9 @@ struct bme680_data {
> * transfer buffers to live in their own cache lines.
> */
> union {
> + u8 buf[3];
> + unsigned int check;
> + __be16 be16;
> u8 bme680_cal_buf_1[BME680_CALIB_RANGE_1_LEN];
> u8 bme680_cal_buf_2[BME680_CALIB_RANGE_2_LEN];
> u8 bme680_cal_buf_3[BME680_CALIB_RANGE_3_LEN];
> @@ -453,7 +456,6 @@ static u8 bme680_oversampling_to_reg(u8 val)
> static int bme680_wait_for_eoc(struct bme680_data *data)
> {
> struct device *dev = regmap_get_device(data->regmap);
> - unsigned int check;
> int ret;
> /*
> * (Sum of oversampling ratios * time per oversampling) +
> @@ -466,16 +468,16 @@ static int bme680_wait_for_eoc(struct bme680_data *data)
>
> usleep_range(wait_eoc_us, wait_eoc_us + 100);
>
> - ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &check);
> + ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &data->check);
> if (ret) {
> dev_err(dev, "failed to read measurement status register.\n");
> return ret;
> }
> - if (check & BME680_MEAS_BIT) {
> + if (data->check & BME680_MEAS_BIT) {
> dev_err(dev, "Device measurement cycle incomplete.\n");
> return -EBUSY;
> }
> - if (!(check & BME680_NEW_DATA_BIT)) {
> + if (!(data->check & BME680_NEW_DATA_BIT)) {
> dev_err(dev, "No new data available from the device.\n");
> return -ENODATA;
> }
> @@ -564,7 +566,6 @@ static int bme680_read_temp(struct bme680_data *data, int *val)
> {
> struct device *dev = regmap_get_device(data->regmap);
> int ret;
> - __be32 tmp = 0;
> u32 adc_temp;
> s16 comp_temp;
>
> @@ -578,13 +579,14 @@ static int bme680_read_temp(struct bme680_data *data, int *val)
> return ret;
>
> ret = regmap_bulk_read(data->regmap, BME680_REG_TEMP_MSB,
> - &tmp, 3);
> + data->buf, BME680_TEMP_NUM_BYTES);
> if (ret < 0) {
> dev_err(dev, "failed to read temperature\n");
> return ret;
> }
>
> - adc_temp = be32_to_cpu(tmp) >> 12;
> + adc_temp = FIELD_GET(BME680_MEAS_TRIM_MASK,
> + get_unaligned_be24(data->buf));
> if (adc_temp == BME680_MEAS_SKIPPED) {
> /* reading was skipped */
> dev_err(dev, "reading temperature skipped\n");
> @@ -610,7 +612,6 @@ static int bme680_read_press(struct bme680_data *data,
> {
> struct device *dev = regmap_get_device(data->regmap);
> int ret;
> - __be32 tmp = 0;
> u32 adc_press;
>
> /* Read and compensate temperature to get a reading of t_fine */
> @@ -619,13 +620,14 @@ static int bme680_read_press(struct bme680_data *data,
> return ret;
>
> ret = regmap_bulk_read(data->regmap, BME680_REG_PRESS_MSB,
> - &tmp, 3);
> + data->buf, BME680_PRESS_NUM_BYTES);
> if (ret < 0) {
> dev_err(dev, "failed to read pressure\n");
> return ret;
> }
>
> - adc_press = be32_to_cpu(tmp) >> 12;
> + adc_press = FIELD_GET(BME680_MEAS_TRIM_MASK,
> + get_unaligned_be24(data->buf));
> if (adc_press == BME680_MEAS_SKIPPED) {
> /* reading was skipped */
> dev_err(dev, "reading pressure skipped\n");
> @@ -642,7 +644,6 @@ static int bme680_read_humid(struct bme680_data *data,
> {
> struct device *dev = regmap_get_device(data->regmap);
> int ret;
> - __be16 tmp = 0;
> u16 adc_humidity;
> u32 comp_humidity;
>
> @@ -652,13 +653,13 @@ static int bme680_read_humid(struct bme680_data *data,
> return ret;
>
> ret = regmap_bulk_read(data->regmap, BME680_REG_HUMIDITY_MSB,
> - &tmp, sizeof(tmp));
> + &data->be16, BME680_HUMID_NUM_BYTES);
> if (ret < 0) {
> dev_err(dev, "failed to read humidity\n");
> return ret;
> }
>
> - adc_humidity = be16_to_cpu(tmp);
> + adc_humidity = be16_to_cpu(data->be16);
> if (adc_humidity == BME680_MEAS_SKIPPED) {
> /* reading was skipped */
> dev_err(dev, "reading humidity skipped\n");
> @@ -676,8 +677,6 @@ static int bme680_read_gas(struct bme680_data *data,
> {
> struct device *dev = regmap_get_device(data->regmap);
> int ret;
> - __be16 tmp = 0;
> - unsigned int check;
> u16 adc_gas_res, gas_regs_val;
> u8 gas_range;
>
> @@ -697,19 +696,20 @@ static int bme680_read_gas(struct bme680_data *data,
> if (ret)
> return ret;
>
> - ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &check);
> - if (check & BME680_GAS_MEAS_BIT) {
> + ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &data->check);
> + if (data->check & BME680_GAS_MEAS_BIT) {
> dev_err(dev, "gas measurement incomplete\n");
> return -EBUSY;
> }
>
> ret = regmap_bulk_read(data->regmap, BME680_REG_GAS_MSB,
> - &tmp, sizeof(tmp));
> + &data->be16, BME680_GAS_NUM_BYTES);
> if (ret < 0) {
> dev_err(dev, "failed to read gas resistance\n");
> return ret;
> }
> - gas_regs_val = be16_to_cpu(tmp);
> +
> + gas_regs_val = be16_to_cpu(data->be16);
> adc_gas_res = FIELD_GET(BME680_ADC_GAS_RES, gas_regs_val);
>
> /*
> @@ -838,7 +838,6 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
> {
> struct iio_dev *indio_dev;
> struct bme680_data *data;
> - unsigned int val;
> int ret;
>
> indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> @@ -869,15 +868,15 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
> return ret;
> }
>
> - ret = regmap_read(regmap, BME680_REG_CHIP_ID, &val);
> + ret = regmap_read(regmap, BME680_REG_CHIP_ID, &data->check);
> if (ret < 0) {
> dev_err(dev, "Error reading chip ID\n");
> return ret;
> }
>
> - if (val != BME680_CHIP_ID_VAL) {
> + if (data->check != BME680_CHIP_ID_VAL) {
> dev_err(dev, "Wrong chip ID, got %x expected %x\n",
> - val, BME680_CHIP_ID_VAL);
> + data->check, BME680_CHIP_ID_VAL);
> return -ENODEV;
> }
>
> --
> 2.25.1
>
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