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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: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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1 changed files with 5 additions and 2 deletions
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@ -249,6 +249,7 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
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int bits_per_word = t ? t->bits_per_word : spi->bits_per_word;
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u32 pm, hz = t ? t->speed_hz : spi->max_speed_hz;
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struct spi_mpc8xxx_cs *cs = spi->controller_state;
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u32 hw_mode_old = cs->hw_mode;
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/* mask out bits we are going to set */
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cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF));
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@ -271,8 +272,10 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
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cs->hw_mode |= CSMODE_PM(pm);
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fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODEx(spi->chip_select),
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cs->hw_mode);
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/* don't write the mode register if the mode doesn't change */
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if (cs->hw_mode != hw_mode_old)
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fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODEx(spi->chip_select),
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cs->hw_mode);
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}
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static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
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