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spi: sprd: Fix the error data length in SPI read-only mode 

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>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lanqing Liu 2019-01-15 21:46:50 +08:00 committed by Mark Brown
parent baf8b9f8d2
commit 63f5ffc46d
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 4 deletions
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10
drivers/spi/spi-sprd.c
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@ -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); struct sprd_spi *ss = spi_controller_get_devdata(sdev->controller);
u32 trans_len = ss->trans_len, len; u32 trans_len = ss->trans_len, len;
int ret, write_size = 0; int ret, write_size = 0, read_size = 0;
while (trans_len) { while (trans_len) {
len = trans_len > SPRD_SPI_FIFO_SIZE ? SPRD_SPI_FIFO_SIZE : 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; goto complete;
if (ss->trans_mode & SPRD_SPI_RX_MODE) if (ss->trans_mode & SPRD_SPI_RX_MODE)
ss->read_bufs(ss, len); read_size += ss->read_bufs(ss, len);
trans_len -= len; trans_len -= len;
} }
ret = write_size; if (ss->trans_mode & SPRD_SPI_TX_MODE)
ret = write_size;
else
ret = read_size;
complete: complete:
sprd_spi_enter_idle(ss); sprd_spi_enter_idle(ss);