From: Yoshitaka Ikeda ikeda@nskint.co.jp
[ Upstream commit 09134c5322df9f105d9ed324051872d5d0e162aa ]
The reason for dividing by zero is because the dummy bus width is zero, but if the dummy n bytes is zero, it indicates that there is no data transfer, so there is no need for calculation.
Fixes: 7512eaf54190 ("spi: cadence-quadspi: Fix dummy cycle calculation when buswidth > 1") Signed-off-by: Yoshitaka Ikeda ikeda@nskint.co.jp Acked-by: Pratyush Yadav p.yadav@ti.com Link: https://lore.kernel.org/r/OSZPR01MB70049C8F56ED8902852DF97B8BD49@OSZPR01MB70... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/atmel-quadspi.c | 2 +- drivers/spi/spi-bcm-qspi.c | 3 ++- drivers/spi/spi-mtk-nor.c | 2 +- drivers/spi/spi-stm32-qspi.c | 2 +- 4 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c index 95d4fa32c2995..92d9610df1fd8 100644 --- a/drivers/spi/atmel-quadspi.c +++ b/drivers/spi/atmel-quadspi.c @@ -310,7 +310,7 @@ static int atmel_qspi_set_cfg(struct atmel_qspi *aq, return mode; ifr |= atmel_qspi_modes[mode].config;
- if (op->dummy.buswidth && op->dummy.nbytes) + if (op->dummy.nbytes) dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth;
/* diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c index ea1865c08fc22..151e154284bde 100644 --- a/drivers/spi/spi-bcm-qspi.c +++ b/drivers/spi/spi-bcm-qspi.c @@ -395,7 +395,8 @@ static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi, if (addrlen == BSPI_ADDRLEN_4BYTES) bpp = BSPI_BPP_ADDR_SELECT_MASK;
- bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth; + if (op->dummy.nbytes) + bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth;
switch (width) { case SPI_NBITS_SINGLE: diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c index 41e7b341d2616..5c93730615f8d 100644 --- a/drivers/spi/spi-mtk-nor.c +++ b/drivers/spi/spi-mtk-nor.c @@ -160,7 +160,7 @@ static bool mtk_nor_match_read(const struct spi_mem_op *op) { int dummy = 0;
- if (op->dummy.buswidth) + if (op->dummy.nbytes) dummy = op->dummy.nbytes * BITS_PER_BYTE / op->dummy.buswidth;
if ((op->data.buswidth == 2) || (op->data.buswidth == 4)) { diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c index 27f35aa2d746d..514337c86d2c3 100644 --- a/drivers/spi/spi-stm32-qspi.c +++ b/drivers/spi/spi-stm32-qspi.c @@ -397,7 +397,7 @@ static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op) ccr |= FIELD_PREP(CCR_ADSIZE_MASK, op->addr.nbytes - 1); }
- if (op->dummy.buswidth && op->dummy.nbytes) + if (op->dummy.nbytes) ccr |= FIELD_PREP(CCR_DCYC_MASK, op->dummy.nbytes * 8 / op->dummy.buswidth);