linux-kernel - [RFC/PATCH 3/3] driver: spi: Add quad spi read support

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Date:	Mon, 8 Jul 2013 19:13:00 +0530
From:	Sourav Poddar <sourav.poddar@...com>
To:	<broonie@...nel.org>, <spi-devel-general@...ts.sourceforge.net>,
	<grant.likely@...aro.org>
CC:	<balbi@...com>, <rnayak@...com>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Sourav Poddar <sourav.poddar@...com>
Subject: [RFC/PATCH 3/3] driver: spi: Add quad spi read support

Since, qspi controller uses quad read.

Configuring the command register, if the transfer of data needs
quad lines.

This patch has been done on top of the following patch[1], which is still
under review/comments.
This patch will also go changes, as the parent patch[1] does.

[1]: http://comments.gmane.org/gmane.linux.kernel.spi.devel/14047

Signed-off-by: Sourav Poddar <sourav.poddar@...com>
---
 drivers/spi/spi-ti-qspi.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index 430de9c..307cbed 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -258,8 +258,12 @@ static int qspi_read_msg(struct dra7xxx_qspi *qspi, struct spi_transfer *t)
 			qspi->cmd | QSPI_RD_SNGL, qspi->dc);
 		dra7xxx_writel(qspi, QSPI_WC_INT_EN, QSPI_INTR_ENABLE_SET_REG);
 		dra7xxx_writel(qspi, qspi->dc, QSPI_SPI_DC_REG);
-		dra7xxx_writel(qspi, qspi->cmd | QSPI_RD_SNGL,
-			QSPI_SPI_CMD_REG);
+		if (t->bitwidth == SPI_BITWIDTH_QUAD)
+			dra7xxx_writel(qspi, qspi->cmd | QSPI_RD_QUAD,
+				QSPI_SPI_CMD_REG);
+		else
+			dra7xxx_writel(qspi, qspi->cmd | QSPI_RD_SNGL,
+				QSPI_SPI_CMD_REG);
 		wait_for_completion(&qspi->word_complete);
 		*rxbuf++ = dra7xxx_readl_data(qspi, QSPI_SPI_DATA_REG, wlen);
 		dev_dbg(qspi->dev, "rx done, read %02x\n", *(rxbuf-1));
-- 
1.7.1

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