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spi: spi-fsl-dspi: Fill actual_length when doing DMA transfer 

Upper layer users of SPI device drivers may rely on 'actual_length',
so it is important that information is correctly reported. One such
example is spi_mem_exec_op() function that will fail if
'actual_length' of the data transferred is not what was requested. Add
necessary code to populate 'actual_length.

Cc: Mark Brown <broonie@kernel.org>
Cc: Sanchayan Maity <maitysanchayan@gmail.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: cphealy@gmail.com
Cc: linux-spi@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andrey Smirnov 2018-07-16 21:33:29 -07:00 committed by Mark Brown
parent 504f2565a4
commit 5f8f80356e
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 5 additions and 2 deletions
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7
drivers/spi/spi-fsl-dspi.c
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@ -358,6 +358,7 @@ static int dspi_dma_xfer(struct fsl_dspi *dspi)
{
struct fsl_dspi_dma *dma = dspi->dma;
struct device *dev = &dspi->pdev->dev;
struct spi_message *message = dspi->cur_msg;
int curr_remaining_bytes;
int bytes_per_buffer;
int ret = 0;
@ -377,8 +378,10 @@ static int dspi_dma_xfer(struct fsl_dspi *dspi)
goto exit;
} else {
curr_remaining_bytes -= dma->curr_xfer_len
* dspi->bytes_per_word;
const int len =
dma->curr_xfer_len * dspi->bytes_per_word;
curr_remaining_bytes -= len;
message->actual_length += len;
if (curr_remaining_bytes < 0)
curr_remaining_bytes = 0;
}