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spi-topcliff-pch: add tx-memory clear after complete transmitting

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Currently, in case of reading date from SPI flash,
command is sent twice.
The cause is that tx-memory clear processing is missing .
This patch adds the tx-momory clear processing.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Tomoya MORINAGA 2011-09-06 17:16:34 +09:00 committed by Grant Likely
parent 387719c2ec
commit 27504be5c1
1 changed files with 5 additions and 0 deletions
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5
drivers/spi/spi-topcliff-pch.c
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@ -837,6 +837,11 @@ static void pch_spi_start_transfer(struct pch_spi_data *data)
dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent,
DMA_FROM_DEVICE);
dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent,
DMA_FROM_DEVICE);
memset(data->dma.tx_buf_virt, 0, PAGE_SIZE);
async_tx_ack(dma->desc_rx);
async_tx_ack(dma->desc_tx);
kfree(dma->sg_tx_p);