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

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Message-Id: <1418763946-22260-3-git-send-email-abrestic@chromium.org>
Date:	Tue, 16 Dec 2014 13:05:46 -0800
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Sifan Naeem <sifan.naeem@...tec.com>, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andrew Bresticker <abrestic@...omium.org>
Subject: [PATCH 3/3] spi: img-spfi: Increase DMA burst size

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@...omium.org>
---
 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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