linux-kernel - [PATCH] spi: Limit the spi device max speed to controller's max speed

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Message-ID: <20201209173514.93328-1-tudor.ambarus@microchip.com>
Date:   Wed, 9 Dec 2020 19:35:14 +0200
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <broonie@...nel.org>, <linux-spi@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH] spi: Limit the spi device max speed to controller's max speed

Make sure the max_speed_hz of spi_device does not override
the max_speed_hz of controller.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/spi/spi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index cd3c395b4e90..51d7c004fbab 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3378,7 +3378,8 @@ int spi_setup(struct spi_device *spi)
 	if (status)
 		return status;
 
-	if (!spi->max_speed_hz)
+	if (!spi->max_speed_hz ||
+	    spi->max_speed_hz > spi->controller->max_speed_hz)
 		spi->max_speed_hz = spi->controller->max_speed_hz;
 
 	mutex_lock(&spi->controller->io_mutex);
-- 
2.25.1