spi: mxc_spi: Set master mode for all channels

[karo-tx-uboot.git] / drivers / spi / mxc_spi.c

diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c
index 4c19e0bf18b65cdb08faab5141c79be759080dea..20419e6bc6779fcad35b2abb562e1114a7e184ba 100644 (file)
--- a/drivers/spi/mxc_spi.c
+++ b/drivers/spi/mxc_spi.c
@@ -137,11 +137,15 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
                return -1;
        }
 
-       /* Reset spi */
-       reg_write(&regs->ctrl, 0);
-       reg_write(&regs->ctrl, MXC_CSPICTRL_EN);
-
-       reg_ctrl = reg_read(&regs->ctrl);
+       /*
+        * Reset SPI and set all CSs to master mode, if toggling
+        * between slave and master mode we might see a glitch
+        * on the clock line
+        */
+       reg_ctrl = MXC_CSPICTRL_MODE_MASK;
+       reg_write(&regs->ctrl, reg_ctrl);
+       reg_ctrl |=  MXC_CSPICTRL_EN;
+       reg_write(&regs->ctrl, reg_ctrl);
 
        /*
         * The following computation is taken directly from Freescale's code.
@@ -174,9 +178,6 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
        reg_ctrl = (reg_ctrl & ~MXC_CSPICTRL_POSTDIV(0x0F)) |
                MXC_CSPICTRL_POSTDIV(post_div);
 
-       /* always set to master mode */
-       reg_ctrl |= 1 << (cs + 4);
-
        /* We need to disable SPI before changing registers */
        reg_ctrl &= ~MXC_CSPICTRL_EN;