| Message ID | 1419276916-28433-1-git-send-email-abrestic@chromium.org (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 76fe5e95fac3c93bdff9102480e5ba823ba656c3 |
| Headers | show |
On Mon, Dec 22, 2014 at 11:35:15AM -0800, Andrew Bresticker wrote: > 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. Applied both, thanks.
diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c index cd14556..aad6683 100644 --- a/drivers/spi/spi-img-spfi.c +++ b/drivers/spi/spi-img-spfi.c @@ -341,7 +341,7 @@ static int img_spfi_start_dma(struct spi_master *master, default: 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); @@ -368,7 +368,7 @@ static int img_spfi_start_dma(struct spi_master *master, default: txconf.dst_addr = spfi->phys + SPFI_TX_8BIT_VALID_DATA; txconf.dst_addr_width = 1; - txconf.dst_maxburst = 1; + txconf.dst_maxburst = 4; break; } dmaengine_slave_config(spfi->tx_ch, &txconf);
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@chromium.org> --- drivers/spi/spi-img-spfi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)