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spi: bcm-qspi: set transfer parameter only if they change 

Check if the transfer parameters have changed from previous settings
before applying new parameters.

Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Link: https://lore.kernel.org/r/20211124193353.32311-3-kdasu.kdev@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Kamal Dasu 2021-11-24 14:33:53 -05:00 committed by Mark Brown
parent c74526f947
commit e10a6bb5f5
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1 changed files with 12 additions and 0 deletions
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12
drivers/spi/spi-bcm-qspi.c
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@ -598,12 +598,24 @@ static void bcm_qspi_chip_select(struct bcm_qspi *qspi, int cs)
qspi->curr_cs = cs;
}
static bool bcmspi_parms_did_change(const struct bcm_qspi_parms * const cur,
const struct bcm_qspi_parms * const prev)
{
return (cur->speed_hz != prev->speed_hz) ||
(cur->mode != prev->mode) ||
(cur->bits_per_word != prev->bits_per_word);
}
/* MSPI helpers */
static void bcm_qspi_hw_set_parms(struct bcm_qspi *qspi,
const struct bcm_qspi_parms *xp)
{
u32 spcr, spbr = 0;
if (!bcmspi_parms_did_change(xp, &qspi->last_parms))
return;
if (!qspi->mspi_maj_rev)
/* legacy controller */
spcr = MSPI_MASTER_BIT;