[PATCH 3/3] spi: img-spfi: Increase DMA burst size

From: Andrew Bresticker
Date: Tue Dec 16 2014 - 16:06:28 EST


A 1-byte burst size is rather inefficient and has been shown to cause
TX issues during testing. Increase the DMA burst size to 4-bytes for
both RX and TX DMA when using the 8-bit FIFO.

Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
---
drivers/spi/spi-img-spfi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c
index 2b29df0..29b97f8 100644
--- a/drivers/spi/spi-img-spfi.c
+++ b/drivers/spi/spi-img-spfi.c
@@ -336,7 +336,7 @@ static int img_spfi_start_dma(struct spi_master *master,
} else {
rxconf.src_addr = spfi->phys + SPFI_RX_8BIT_VALID_DATA;
rxconf.src_addr_width = 1;
- rxconf.src_maxburst = 1;
+ rxconf.src_maxburst = 4;
}
dmaengine_slave_config(spfi->rx_ch, &rxconf);

@@ -360,7 +360,7 @@ static int img_spfi_start_dma(struct spi_master *master,
} else {
txconf.dst_addr = spfi->phys + SPFI_TX_8BIT_VALID_DATA;
txconf.dst_addr_width = 1;
- txconf.dst_maxburst = 1;
+ txconf.dst_maxburst = 4;
}
dmaengine_slave_config(spfi->tx_ch, &txconf);

--
2.2.0.rc0.207.ga3a616c

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