[U-Boot] [PATCH 1/2] spi: spi-mxc: implement clk control for ECSPI to fix SPI_MODE_3

[Markus Niebel]

From: Markus Niebel <Markus.Niebel at tqs.de>

SPI_MODE_3 requires clk high when inactive. The SCLK_CTL
field of the config reg was not configured. Provide defines
for missing fields in the ECSPI config reg and use them
for SPI_CPOL

Signed-off-by: Markus Niebel <Markus.Niebel at tqs.de>
---
 arch/arm/include/asm/arch-mx5/imx-regs.h |    9 ++++++---
 arch/arm/include/asm/arch-mx6/imx-regs.h |    9 ++++++---
 drivers/spi/mxc_spi.c                    |    9 +++++++--
 3 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/arch/arm/include/asm/arch-mx5/imx-regs.h b/arch/arm/include/asm/arch-mx5/imx-regs.h
index 4955ccf..32386d3 100644
--- a/arch/arm/include/asm/arch-mx5/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx5/imx-regs.h
@@ -230,9 +230,12 @@
 #define MXC_CSPICTRL_CHAN	18
 
 /* Bit position inside CON register to be associated with SS */
-#define MXC_CSPICON_POL		4
-#define MXC_CSPICON_PHA		0
-#define MXC_CSPICON_SSPOL	12
+#define MXC_CSPICON_PHA		0  /* SCLK phase control */
+#define MXC_CSPICON_POL		4  /* SCLK polarity */
+#define MXC_CSPICON_SSCTL	8  /* SS wave form select */
+#define MXC_CSPICON_SSPOL	12 /* SS polarity */
+#define MXC_CSPICON_DCTL	16 /* inactive state of MOSI */
+#define MXC_CSPICON_CTL		20 /* inactive state of SCLK */
 #define MXC_SPI_BASE_ADDRESSES \
 	CSPI1_BASE_ADDR, \
 	CSPI2_BASE_ADDR, \
diff --git a/arch/arm/include/asm/arch-mx6/imx-regs.h b/arch/arm/include/asm/arch-mx6/imx-regs.h
index f2ad6e9..79842bf 100644
--- a/arch/arm/include/asm/arch-mx6/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx6/imx-regs.h
@@ -405,9 +405,12 @@ struct cspi_regs {
 #define MXC_CSPICTRL_CHAN	18
 
 /* Bit position inside CON register to be associated with SS */
-#define MXC_CSPICON_POL		4
-#define MXC_CSPICON_PHA		0
-#define MXC_CSPICON_SSPOL	12
+#define MXC_CSPICON_PHA		0  /* SCLK phase control */
+#define MXC_CSPICON_POL		4  /* SCLK polarity */
+#define MXC_CSPICON_SSCTL	8  /* SS wave form select */
+#define MXC_CSPICON_SSPOL	12 /* SS polarity */
+#define MXC_CSPICON_DCTL	16 /* inactive state of MOSI */
+#define MXC_CSPICON_CTL		20 /* inactive state of SCLK */
 #ifdef CONFIG_MX6SL
 #define MXC_SPI_BASE_ADDRESSES \
 	ECSPI1_BASE_ADDR, \
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c
index 95dd03f..f3f029d 100644
--- a/drivers/spi/mxc_spi.c
+++ b/drivers/spi/mxc_spi.c
@@ -115,7 +115,8 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
 {
 	u32 clk_src = mxc_get_clock(MXC_CSPI_CLK);
 	s32 reg_ctrl, reg_config;
-	u32 ss_pol = 0, sclkpol = 0, sclkpha = 0, pre_div = 0, post_div = 0;
+	u32 ss_pol = 0, sclkpol = 0, sclkpha = 0, sclkctl = 0;
+	u32 pre_div = 0, post_div = 0;
 	struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
 
 	if (max_hz == 0) {
@@ -164,8 +165,10 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
 	if (mode & SPI_CS_HIGH)
 		ss_pol = 1;
 
-	if (mode & SPI_CPOL)
+	if (mode & SPI_CPOL) {
 		sclkpol = 1;
+		sclkctl = 1;
+	}
 
 	if (mode & SPI_CPHA)
 		sclkpha = 1;
@@ -180,6 +183,8 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
 		(ss_pol << (cs + MXC_CSPICON_SSPOL));
 	reg_config = (reg_config & ~(1 << (cs + MXC_CSPICON_POL))) |
 		(sclkpol << (cs + MXC_CSPICON_POL));
+	reg_config = (reg_config & ~(1 << (cs + MXC_CSPICON_CTL))) |
+		(sclkctl << (cs + MXC_CSPICON_CTL));
 	reg_config = (reg_config & ~(1 << (cs + MXC_CSPICON_PHA))) |
 		(sclkpha << (cs + MXC_CSPICON_PHA));
 
-- 
1.7.9.5