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From: Paul Cercueil <paul@crapouillou.net>
To: Jonathan Cameron <jic23@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Paul Cercueil <paul@crapouillou.net>,
	Eugen Hristev <eugen.hristev@microchip.com>,
	Nicolas Ferre <nicolas.ferre@microchip.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Ludovic Desroches <ludovic.desroches@microchip.com>
Subject: [PATCH 2/2] iio: at91-sama5d2: Limit requested watermark value to hwfifo size
Date: Mon, 17 Jan 2022 10:25:12 +0000	[thread overview]
Message-ID: <20220117102512.31725-2-paul@crapouillou.net> (raw)
In-Reply-To: <20220117102512.31725-1-paul@crapouillou.net>

Instead of returning an error if the watermark value is too high, which
the core will silently ignore anyway, limit the value to the hardware
FIFO size; a lower-than-requested value is still better than using the
default, which is usually 1.

Cc: Eugen Hristev <eugen.hristev@microchip.com>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/iio/adc/at91-sama5d2_adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index 854b1f81d807..5cc84f4a17bb 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -1752,7 +1752,7 @@ static int at91_adc_set_watermark(struct iio_dev *indio_dev, unsigned int val)
 	int ret;
 
 	if (val > AT91_HWFIFO_MAX_SIZE)
-		return -EINVAL;
+		val = AT91_HWFIFO_MAX_SIZE;
 
 	if (!st->selected_trig->hw_trig) {
 		dev_dbg(&indio_dev->dev, "we need hw trigger for DMA\n");
-- 
2.34.1


WARNING: multiple messages have this Message-ID
From: Paul Cercueil <paul@crapouillou.net>
To: Jonathan Cameron <jic23@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>,
	linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
	Paul Cercueil <paul@crapouillou.net>,
	Ludovic Desroches <ludovic.desroches@microchip.com>,
	Eugen Hristev <eugen.hristev@microchip.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] iio: at91-sama5d2: Limit requested watermark value to hwfifo size
Date: Mon, 17 Jan 2022 10:25:12 +0000	[thread overview]
Message-ID: <20220117102512.31725-2-paul@crapouillou.net> (raw)
In-Reply-To: <20220117102512.31725-1-paul@crapouillou.net>

Instead of returning an error if the watermark value is too high, which
the core will silently ignore anyway, limit the value to the hardware
FIFO size; a lower-than-requested value is still better than using the
default, which is usually 1.

Cc: Eugen Hristev <eugen.hristev@microchip.com>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/iio/adc/at91-sama5d2_adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index 854b1f81d807..5cc84f4a17bb 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -1752,7 +1752,7 @@ static int at91_adc_set_watermark(struct iio_dev *indio_dev, unsigned int val)
 	int ret;
 
 	if (val > AT91_HWFIFO_MAX_SIZE)
-		return -EINVAL;
+		val = AT91_HWFIFO_MAX_SIZE;
 
 	if (!st->selected_trig->hw_trig) {
 		dev_dbg(&indio_dev->dev, "we need hw trigger for DMA\n");
-- 
2.34.1


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  reply	other threads:[~2022-01-17 10:25 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-17 10:25 [PATCH 1/2] iio: imu: st_lsm6dsx: " Paul Cercueil
2022-01-17 10:25 ` Paul Cercueil
2022-01-17 10:25 ` Paul Cercueil [this message]
2022-01-17 10:25   ` [PATCH 2/2] iio: at91-sama5d2: " Paul Cercueil
2022-01-22 17:04   ` Jonathan Cameron
2022-01-22 17:04     ` Jonathan Cameron
2022-06-04 15:05     ` Jonathan Cameron
2022-06-04 15:05       ` Jonathan Cameron
2022-06-04 22:41       ` Paul Cercueil
2022-06-04 22:41         ` Paul Cercueil
2022-06-12  8:49         ` Jonathan Cameron
2022-06-12  8:49           ` Jonathan Cameron
2022-01-17 10:56 ` [PATCH 1/2] iio: imu: st_lsm6dsx: " Lorenzo Bianconi
2022-01-17 10:56   ` Lorenzo Bianconi

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