linux-kernel - [PATCH RFC v1 2/2] iio: light: rpr0521: Drop unnecessary checks for timestamp value

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Message-Id: <20240922162041.525896-3-vassilisamir@gmail.com>
Date: Sun, 22 Sep 2024 18:20:41 +0200
From: Vasileios Amoiridis <vassilisamir@...il.com>
To: jic23@...nel.org,
	lars@...afoo.de
Cc: andy.shevchenko@...il.com,
	u.kleine-koenig@...gutronix.de,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Vasileios Amoiridis <vassilisamir@...il.com>
Subject: [PATCH RFC v1 2/2] iio: light: rpr0521: Drop unnecessary checks for timestamp value

The rpr0521_trigger_consumer_handler() is registered as the trigger
threaded handler in the devm_iio_triggered_buffer_setup() function.
This function is being called in 2 ways:

a) when there is a registered trigger being trigger like sysfs or hrt.
The call of the trigger handler (which is the iio_pollfunc_store_time())
follows which saves the timestamp and then, wakes up the trigger
threaded handler.

b) The irq handler is using the iio_trigger_poll_nested() which wakes
up the trigger threaded handler.

In both cases, the pf->timestamp has already been assigned a value
so there is no need to check if it is 0, neither to 0 it after
the push to the buffer.

Signed-off-by: Vasileios Amoiridis <vassilisamir@...il.com>
---
 drivers/iio/light/rpr0521.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/iio/light/rpr0521.c b/drivers/iio/light/rpr0521.c
index 56f5fbbf79ac..ae6a22b91b8d 100644
--- a/drivers/iio/light/rpr0521.c
+++ b/drivers/iio/light/rpr0521.c
@@ -446,13 +446,8 @@ static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p)
 	int err;
 
 	/* Use irq timestamp when reasonable. */
-	if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) {
+	if (iio_trigger_using_own(indio_dev))
 		pf->timestamp = data->irq_timestamp;
-		data->irq_timestamp = 0;
-	}
-	/* Other chained trigger polls get timestamp only here. */
-	if (!pf->timestamp)
-		pf->timestamp = iio_get_time_ns(indio_dev);
 
 	err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA,
 		data->scan.channels,
@@ -463,7 +458,6 @@ static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p)
 	else
 		dev_err(&data->client->dev,
 			"Trigger consumer can't read from sensor.\n");
-	pf->timestamp = 0;
 
 	iio_trigger_notify_done(indio_dev->trig);
 
-- 
2.25.1