From 6939484a425a87d3d8fd168f721d9cf8a0fa86dd Mon Sep 17 00:00:00 2001 From: Francesco Lavra Date: Mon, 19 Jan 2026 11:23:17 +0100 Subject: [PATCH] iio: accel: adxl380: Optimize reading of FIFO entries in interrupt handler 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 Signed-off-by: Jonathan Cameron --- drivers/iio/accel/adxl380.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/iio/accel/adxl380.c b/drivers/iio/accel/adxl380.c index a77c2323d1aa..8870d22e8cdd 100644 --- a/drivers/iio/accel/adxl380.c +++ b/drivers/iio/accel/adxl380.c @@ -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; }