From 263b81dc6c932c8bc550d5e7bfc178d2b3fc491e Mon Sep 17 00:00:00 2001 From: Angelo Dureghello Date: Fri, 29 May 2020 21:57:56 +0200 Subject: [PATCH] spi: spi-fsl-dspi: fix native data copy ColdFire is a big-endian cpu with a big-endian dspi hw module, so, it uses native access, but memcpy breaks the endianness. So, if i understand properly, by native copy we would mean be(cpu)->be(dspi) or le(cpu)->le(dspi) accesses, so my fix shouldn't break anything, but i couldn't test it on LS family, so every test is really appreciated. Fixes: 53fadb4d90c7 ("spi: spi-fsl-dspi: Simplify bytes_per_word gymnastics") Signed-off-by: Angelo Dureghello Tested-by: Vladimir Oltean Reviewed-by: Vladimir Oltean Link: https://lore.kernel.org/r/20200529195756.184677-1-angelo.dureghello@timesys.com Signed-off-by: Mark Brown --- drivers/spi/spi-fsl-dspi.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 685afdf..a35face 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -250,13 +250,33 @@ struct fsl_dspi { static void dspi_native_host_to_dev(struct fsl_dspi *dspi, u32 *txdata) { - memcpy(txdata, dspi->tx, dspi->oper_word_size); + switch (dspi->oper_word_size) { + case 1: + *txdata = *(u8 *)dspi->tx; + break; + case 2: + *txdata = *(u16 *)dspi->tx; + break; + case 4: + *txdata = *(u32 *)dspi->tx; + break; + } dspi->tx += dspi->oper_word_size; } static void dspi_native_dev_to_host(struct fsl_dspi *dspi, u32 rxdata) { - memcpy(dspi->rx, &rxdata, dspi->oper_word_size); + switch (dspi->oper_word_size) { + case 1: + *(u8 *)dspi->rx = rxdata; + break; + case 2: + *(u16 *)dspi->rx = rxdata; + break; + case 4: + *(u32 *)dspi->rx = rxdata; + break; + } dspi->rx += dspi->oper_word_size; } -- 2.7.4