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

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Date:	Wed, 17 Jun 2015 11:01:02 +0100
From:	Sifan Naeem <sifan.naeem@...tec.com>
To:	<broonie@...nel.org>
CC:	<linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<abrestic@...omium.org>, Sifan Naeem <sifan.naeem@...tec.com>
Subject: [PATCH v2] spi: img-spfi: Same Edge bit set to double supported transfer speed

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@...tec.com>
---
 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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