Messages in this thread Patch in this message | | | From | Baolin Wang <> | Subject | [PATCH 1/4] spi: sprd: Fix the error data length in SPI read-only mode | Date | Tue, 15 Jan 2019 21:46:50 +0800 |
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From: Lanqing Liu <lanqing.liu@spreadtrum.com>
In SPI read-only mode, we will always return the writing length, which is always the power of "bits_per_word", but the length unit using by users is byte.
Thus this patch fixes the returning length by getting from read_bufs() function to get the correct length.
Signed-off-by: Lanqing Liu <lanqing.liu@spreadtrum.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> --- drivers/spi/spi-sprd.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/spi/spi-sprd.c b/drivers/spi/spi-sprd.c index 8daa24e..fa324ce 100644 --- a/drivers/spi/spi-sprd.c +++ b/drivers/spi/spi-sprd.c @@ -380,7 +380,7 @@ static int sprd_spi_txrx_bufs(struct spi_device *sdev, struct spi_transfer *t) { struct sprd_spi *ss = spi_controller_get_devdata(sdev->controller); u32 trans_len = ss->trans_len, len; - int ret, write_size = 0; + int ret, write_size = 0, read_size = 0; while (trans_len) { len = trans_len > SPRD_SPI_FIFO_SIZE ? SPRD_SPI_FIFO_SIZE : @@ -416,13 +416,15 @@ static int sprd_spi_txrx_bufs(struct spi_device *sdev, struct spi_transfer *t) goto complete; if (ss->trans_mode & SPRD_SPI_RX_MODE) - ss->read_bufs(ss, len); + read_size += ss->read_bufs(ss, len); trans_len -= len; } - ret = write_size; - + if (ss->trans_mode & SPRD_SPI_TX_MODE) + ret = write_size; + else + ret = read_size; complete: sprd_spi_enter_idle(ss); -- 1.7.9.5
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