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Commit 8f3086d2 authored by Heiner Kallweit's avatar Heiner Kallweit Committed by Mark Brown
Browse files

spi: fsl-espi: don't write ESPI_SPMODE register if the mode doesn't change 



There's no need to bother the chip if the mode doesn't change.

Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 60d9531a

drivers/spi/spi-fsl-espi.c

+5 −2
Original line number Diff line number Diff line
@@ -249,6 +249,7 @@ static void fsl_espi_setup_transfer(struct spi_device *spi, 
	int bits_per_word = t ? t->bits_per_word : spi->bits_per_word;

	u32 pm, hz = t ? t->speed_hz : spi->max_speed_hz;

	struct spi_mpc8xxx_cs *cs = spi->controller_state;

	u32 hw_mode_old = cs->hw_mode;



	/* mask out bits we are going to set */

	cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF));
@@ -271,6 +272,8 @@ static void fsl_espi_setup_transfer(struct spi_device *spi, 


	cs->hw_mode |= CSMODE_PM(pm);



	/* don't write the mode register if the mode doesn't change */

	if (cs->hw_mode != hw_mode_old)

		fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODEx(spi->chip_select),

				   cs->hw_mode);

}