| Message ID | 1426265029-12280-1-git-send-email-iivanov@mm-sol.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, 2015-03-13 at 18:43 +0200, Ivan T. Ivanov wrote: > Some devices samples state of the chip select signal during power up > and act differently based on this state, so SPI core should ensure > that CS line is driven in non-active state after spi_setup(). > > Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com> > --- Any comments on this one? Forget to add changes since v1 [1]. CS is set to non-active state unconditionally before spi->master->setup() Regards, Ivan [1] http://www.spinics.net/lists/linux-spi/msg03056.html > drivers/spi/spi.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c > index c64a3e5..4023cc9 100644 > --- a/drivers/spi/spi.c > +++ b/drivers/spi/spi.c > @@ -1893,6 +1893,8 @@ int spi_setup(struct spi_device *spi) > if (!spi->max_speed_hz) > spi->max_speed_hz = spi->master->max_speed_hz; > > + spi_set_cs(spi, false); > + > if (spi->master->setup) > status = spi->master->setup(spi); > -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, Mar 20, 2015 at 06:14:49PM +0200, Ivan T. Ivanov wrote: > Any comments on this one? > Forget to add changes since v1 [1]. > CS is set to non-active state unconditionally before > spi->master->setup() Please don't send content free quoted pings.
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index c64a3e5..4023cc9 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1893,6 +1893,8 @@ int spi_setup(struct spi_device *spi) if (!spi->max_speed_hz) spi->max_speed_hz = spi->master->max_speed_hz; + spi_set_cs(spi, false); + if (spi->master->setup) status = spi->master->setup(spi);
Some devices samples state of the chip select signal during power up and act differently based on this state, so SPI core should ensure that CS line is driven in non-active state after spi_setup(). Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com> --- drivers/spi/spi.c | 2 ++ 1 file changed, 2 insertions(+) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html