linux-kernel - [PATCH 1/3] spi: img-spfi: Enable controller before starting TX DMA

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Message-Id: <1418763946-22260-1-git-send-email-abrestic@chromium.org>
Date:	Tue, 16 Dec 2014 13:05:44 -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 1/3] spi: img-spfi: Enable controller before starting TX DMA

It is recommended that the SPFI controller be enabled (i.e. setting
SPFI_EN in SPFI_CONTROL) before TX DMA begins.

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 43781c9..e7e79e6 100644
--- a/drivers/spi/spi-img-spfi.c
+++ b/drivers/spi/spi-img-spfi.c
@@ -390,14 +390,14 @@ static int img_spfi_start_dma(struct spi_master *master,
 		dma_async_issue_pending(spfi->rx_ch);
 	}
 
+	spfi_start(spfi);
+
 	if (xfer->tx_buf) {
 		spfi->tx_dma_busy = true;
 		dmaengine_submit(txdesc);
 		dma_async_issue_pending(spfi->tx_ch);
 	}
 
-	spfi_start(spfi);
-
 	return 1;
 
 stop_dma:
-- 
2.2.0.rc0.207.ga3a616c

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