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authorFabio Estevam <fabio.estevam@freescale.com>2012-11-15 11:23:24 +0000
committerStefano Babic <sbabic@denx.de>2012-11-19 08:49:00 +0100
commit3cea335c3410f71524b50263b8af0e7eb69ebbe4 (patch)
tree8bd13629d47da2981d0ff603fdd3b2812c8a94c4
parentde5bf02cb1f61de0c65a539cd0083ac8ab07ec50 (diff)
spi: mxc_spi: Fix spi clock glitch durant reset
Measuring the spi clock line on a scope shows a 'glitch' during the reset of the spi. Fix this by toggling only the MXC_CSPICTRL_EN bit, so that the clock line becomes always stable. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Acked-by: Stefano Babic <sbabic@denx.de>
-rw-r--r--drivers/spi/mxc_spi.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c
index b6bad98952..859c43fee2 100644
--- a/drivers/spi/mxc_spi.c
+++ b/drivers/spi/mxc_spi.c
@@ -140,8 +140,8 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
reg_ctrl = reg_read(&regs->ctrl);
/* Reset spi */
- reg_write(&regs->ctrl, 0);
- reg_write(&regs->ctrl, (reg_ctrl | 0x1));
+ reg_write(&regs->ctrl, (reg_ctrl & ~MXC_CSPICTRL_EN));
+ reg_write(&regs->ctrl, (reg_ctrl | MXC_CSPICTRL_EN));
/*
* The following computation is taken directly from Freescale's code.