[PATCH v2] spi: img-spfi: Same Edge bit set to double supported transfer speed

From: Sifan Naeem
Date: Wed Jun 17 2015 - 05:59:31 EST


Same edge bit set in SPFI Control register to double the supported
spfi clock speed. Setting this bit increases the supported spfi
frequency from 1/8 to 1/4 of the core clock frequency.

Without this bit set the maximum speed supported was 25MHz on
Pistachio.

Change-Id: I26782ea88ac3567e72dac11e46c5b5f5f52c5e3d
Signed-off-by: Sifan Naeem <sifan.naeem@xxxxxxxxxx>
---
drivers/spi/spi-img-spfi.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c
index 788e2b1..acce90a 100644
--- a/drivers/spi/spi-img-spfi.c
+++ b/drivers/spi/spi-img-spfi.c
@@ -40,6 +40,7 @@
#define SPFI_CONTROL_SOFT_RESET BIT(11)
#define SPFI_CONTROL_SEND_DMA BIT(10)
#define SPFI_CONTROL_GET_DMA BIT(9)
+#define SPFI_CONTROL_SE BIT(8)
#define SPFI_CONTROL_TMODE_SHIFT 5
#define SPFI_CONTROL_TMODE_MASK 0x7
#define SPFI_CONTROL_TMODE_SINGLE 0
@@ -491,6 +492,7 @@ static void img_spfi_config(struct spi_master *master, struct spi_device *spi,
else if (xfer->tx_nbits == SPI_NBITS_QUAD &&
xfer->rx_nbits == SPI_NBITS_QUAD)
val |= SPFI_CONTROL_TMODE_QUAD << SPFI_CONTROL_TMODE_SHIFT;
+ val |= SPFI_CONTROL_SE;
spfi_writel(spfi, val, SPFI_CONTROL);
}

--
1.7.9.5

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