spi-topcliff-pch: add tx-memory clear after complete transmitting
authorTomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Tue, 6 Sep 2011 08:16:34 +0000 (17:16 +0900)
committerGrant Likely <grant.likely@secretlab.ca>
Tue, 4 Oct 2011 16:10:50 +0000 (10:10 -0600)
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>
drivers/spi/spi-topcliff-pch.c

index 1d23f38318663dfd7682131524d0af179c3ee909..7a98caa3aed2b5b3d9b6e39833ed6c73b572ddeb 100644 (file)
@@ -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);