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spi: spi-mxc: implement clk control for ECSPI to fix SPI_MODE_3

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SPI_MODE_3 requires clk high when inactive. The SCLK_CTL
field of the config reg was not configured in case of CPOL.
Fix configuration so that SPI_MODE_3 which uses CPOL configures
the clk line to be high in inactive state.

Signed-off-by: Markus Niebel <Markus.Niebel@tqs.de>
Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
This commit is contained in:
Markus Niebel 2014-02-17 17:33:17 +01:00 committed by Jagannadha Sutradharudu Teki
parent d7cbcc762e
commit 5d584ccec1
1 changed files with 7 additions and 2 deletions
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9
drivers/spi/mxc_spi.c
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@ -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));