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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>
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Tudor Ambarus 2021-02-10 15:54:28 +02:00 committed by Mark Brown
parent 58898fd82c
commit df6978b7ea
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drivers/spi/atmel-quadspi.c
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@ -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);