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Commit 87bf5ab8 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Grant Likely
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spi/fsl-espi: Make sure pm is within 2..32 



The reference manual says that pm has to stay within 2 and 32. So the
lowest frequency is 32 and DIV16 set, the highest is 2 and DIV16 unset.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 35faa55c

drivers/spi/spi-fsl-espi.c

+6 −4
Original line number Diff line number Diff line
@@ -182,16 +182,18 @@ static int fsl_espi_setup_transfer(struct spi_device *spi, 
		cs->hw_mode |= CSMODE_DIV16;

		pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4);



		WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. "

		WARN_ONCE(pm > 33, "%s: Requested speed is too low: %d Hz. "

			  "Will use %d Hz instead.\n", dev_name(&spi->dev),

			  hz, mpc8xxx_spi->spibrg / 1024);

		if (pm > 16)

			pm = 16;

				hz, mpc8xxx_spi->spibrg / (4 * 16 * (32 + 1)));

		if (pm > 33)

			pm = 33;

	} else {

		pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4);

	}

	if (pm)

		pm--;

	if (pm < 2)

		pm = 2;



	cs->hw_mode |= CSMODE_PM(pm);