Messages in this thread Patch in this message | | | From | Sourav Poddar <> | Subject | [RFC/PATCH 3/3] driver: spi: Add quad spi read support | Date | Mon, 8 Jul 2013 19:13:00 +0530 |
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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@ti.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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