linux-kernel - [PATCH 1/1] Blackfin SPI Driver: Fix bug when SPI full-duplex

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Message-Id: <1209095926-21279-1-git-send-email-cooloney@kernel.org>
Date:	Fri, 25 Apr 2008 11:58:46 +0800
From:	Bryan Wu <cooloney@...nel.org>
To:	dbrownell@...rs.sourceforge.net,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Cc:	Vitja Makarov <vitja.makarov@...il.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 1/1] Blackfin SPI Driver: Fix bug when SPI full-duplex

From: Vitja Makarov <vitja.makarov@...il.com>

Check if full-duplex and DMA are used together, fall-back to PIO mode.

Signed-off-by: Vitja Makarov <vitja.makarov@...il.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 drivers/spi/spi_bfin5xx.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index a9ac1fd..a94f1e9 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -608,6 +608,7 @@ static void pump_transfers(unsigned long data)
 	u8 width;
 	u16 cr, dma_width, dma_config;
 	u32 tranf_success = 1;
+	u8 full_duplex = 0;
 
 	/* Get current state information */
 	message = drv_data->cur_msg;
@@ -658,6 +659,7 @@ static void pump_transfers(unsigned long data)
 	}
 
 	if (transfer->rx_buf != NULL) {
+		full_duplex = transfer->tx_buf != NULL;
 		drv_data->rx = transfer->rx_buf;
 		drv_data->rx_end = drv_data->rx + transfer->len;
 		dev_dbg(&drv_data->pdev->dev, "rx_buf is %p, rx_end is %p\n",
@@ -740,7 +742,7 @@ static void pump_transfers(unsigned long data)
 	 * successful use different way to r/w according to
 	 * drv_data->cur_chip->enable_dma
 	 */
-	if (drv_data->cur_chip->enable_dma && drv_data->len > 6) {
+	if (!full_duplex && drv_data->cur_chip->enable_dma && drv_data->len > 6) {
 
 		disable_dma(drv_data->dma_channel);
 		clear_dma_irqstat(drv_data->dma_channel);
@@ -828,7 +830,7 @@ static void pump_transfers(unsigned long data)
 		/* IO mode write then read */
 		dev_dbg(&drv_data->pdev->dev, "doing IO transfer\n");
 
-		if (drv_data->tx != NULL && drv_data->rx != NULL) {
+		if (full_duplex) {
 			/* full duplex mode */
 			BUG_ON((drv_data->tx_end - drv_data->tx) !=
 			       (drv_data->rx_end - drv_data->rx));
-- 
1.5.5
--
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