From: Fabio Estevam fabio.estevam@freescale.com
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 --- drivers/spi/mxc_spi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index 4bed4f0..102fca5 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(®s->ctrl);
/* Reset spi */ - reg_write(®s->ctrl, 0); - reg_write(®s->ctrl, (reg_ctrl | 0x1)); + reg_write(®s->ctrl, (reg_ctrl & ~MXC_CSPICTRL_EN)); + reg_write(®s->ctrl, (reg_ctrl | MXC_CSPICTRL_EN));
/* * The following computation is taken directly from Freescale's code.