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Unverified Commit 5f8f8035 authored by Andrey Smirnov's avatar Andrey Smirnov Committed by Mark Brown
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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: default avatarAndrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 504f2565

drivers/spi/spi-fsl-dspi.c

+5 −2
Original line number Diff line number Diff line
@@ -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;

		}