From df6978b7ea6349eb32078c42b917559f5510aebd Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Wed, 10 Feb 2021 15:54:28 +0200 Subject: [PATCH] spi: atmel-quadspi: Disable the QSPI IP at suspend() It is safer to disable the QSPI IP at suspend, in order to avoid possible impact of glitches on the internal FSMs. This is a theoretical fix, there were no problems seen as of now. Tested on sama5d2 and sam9x60 versions of the IP. Signed-off-by: Tudor Ambarus Link: https://lore.kernel.org/r/20210210135428.204134-1-tudor.ambarus@microchip.com Signed-off-by: Mark Brown --- drivers/spi/atmel-quadspi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c index 10bc5390ab91..95d4fa32c299 100644 --- a/drivers/spi/atmel-quadspi.c +++ b/drivers/spi/atmel-quadspi.c @@ -657,6 +657,7 @@ static int __maybe_unused atmel_qspi_suspend(struct device *dev) struct spi_controller *ctrl = dev_get_drvdata(dev); struct atmel_qspi *aq = spi_controller_get_devdata(ctrl); + atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR); clk_disable_unprepare(aq->qspick); clk_disable_unprepare(aq->pclk);