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

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Message-ID: <1434468311-13166-1-git-send-email-sifan.naeem@imgtec.com>
Date:	Tue, 16 Jun 2015 16:25:11 +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] 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. According to the TRM setting this bit increases
the supported frequency from 1/8 to 1/4 of the Core clock frequency.

Without this bit set the maximum speed would be 25MHz on Pistachio.

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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