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iio: accel: adxl380: Optimize reading of FIFO entries in interrupt handler

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In order to minimize the time required for transferring FIFO data from the
sensor to the host machine, perform the read from the FIFO in a single call
to regmap_noinc_read().
This allows reading acceleration data for all 3 axes at 16 kHz
sampling frequency using a 1MHz I2C bus frequency.

Signed-off-by: Francesco Lavra <flavra@baylibre.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Francesco Lavra 2026-01-19 11:23:17 +01:00 committed by Jonathan Cameron
parent c1b1401522
commit 6939484a42
1 changed files with 5 additions and 7 deletions
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12
drivers/iio/accel/adxl380.c
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@ -967,14 +967,12 @@ static irqreturn_t adxl380_irq_handler(int irq, void *p)
return IRQ_HANDLED;
fifo_entries = rounddown(fifo_entries, st->fifo_set_size);
for (i = 0; i < fifo_entries; i += st->fifo_set_size) {
ret = regmap_noinc_read(st->regmap, ADXL380_FIFO_DATA,
&st->fifo_buf[i],
2 * st->fifo_set_size);
if (ret)
return IRQ_HANDLED;
ret = regmap_noinc_read(st->regmap, ADXL380_FIFO_DATA, &st->fifo_buf,
sizeof(*st->fifo_buf) * fifo_entries);
if (ret)
return IRQ_HANDLED;
for (i = 0; i < fifo_entries; i += st->fifo_set_size)
iio_push_to_buffers(indio_dev, &st->fifo_buf[i]);
}
return IRQ_HANDLED;
}