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authorTudor Ambarus <tudor.ambarus@microchip.com>2021-02-10 14:54:28 +0100
committerMark Brown <broonie@kernel.org>2021-02-11 14:15:12 +0100
commitdf6978b7ea6349eb32078c42b917559f5510aebd (patch)
treeed5a27f856961b80ad96633c0a67d27a1db5b82b
parentMerge series "spi: add set_cs_timing support for HW/SW CS mode" from Leilk Li... (diff)
downloadlinux-df6978b7ea6349eb32078c42b917559f5510aebd.tar.xz
linux-df6978b7ea6349eb32078c42b917559f5510aebd.zip
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 <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/r/20210210135428.204134-1-tudor.ambarus@microchip.com Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r--drivers/spi/atmel-quadspi.c1
1 files changed, 1 insertions, 0 deletions
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);