| Message ID | 20201204193540.3047030-2-swboyd@chromium.org (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 74639cbf51d7c0304342544a83dfda354a6bd208 |
| Headers | show |
| Series | spi: spi-geni-qcom: Use gpio descriptors for CS | expand |
On Fri, 4 Dec 2020 at 12:35, Stephen Boyd <swboyd@chromium.org> wrote: > > There isn't any need to overwrite the mode here in the driver with what > has been detected by the firmware, such as DT or ACPI. In fact, if we > use the SPI CS gpio descriptor feature we will overwrite the mode with > SPI_MODE_0 where it already contains SPI_MODE_0 and more importantly > SPI_CS_HIGH. Clearing the SPI_CS_HIGH bit causes the CS line to toggle > when the device is probed when it shouldn't change, confusing the driver > and making it fail to probe. Drop the assignment and let the spi core > take care of it. > > Fixes: a17d94f0b6e1 ("mfd: Add ChromeOS EC SPI driver") > Cc: Simon Glass <sjg@chromium.org> > Cc: Gwendal Grignou <gwendal@chromium.org> > Reviewed-by: Douglas Anderson <dianders@chromium.org> > Tested-by: Douglas Anderson <dianders@chromium.org> > Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> > Cc: Alexandru M Stan <amstan@chromium.org> > Signed-off-by: Stephen Boyd <swboyd@chromium.org> > --- > drivers/platform/chrome/cros_ec_spi.c | 1 - > 1 file changed, 1 deletion(-) Reviewed-by: Simon Glass <sjg@chromium.org> > > > diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c > index dfa1f816a45f..f9df218fc2bb 100644 > --- a/drivers/platform/chrome/cros_ec_spi.c > +++ b/drivers/platform/chrome/cros_ec_spi.c > @@ -742,7 +742,6 @@ static int cros_ec_spi_probe(struct spi_device *spi) > int err; > > spi->bits_per_word = 8; > - spi->mode = SPI_MODE_0; > spi->rt = true; > err = spi_setup(spi); > if (err < 0) > -- > https://chromeos.dev >
diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c index dfa1f816a45f..f9df218fc2bb 100644 --- a/drivers/platform/chrome/cros_ec_spi.c +++ b/drivers/platform/chrome/cros_ec_spi.c @@ -742,7 +742,6 @@ static int cros_ec_spi_probe(struct spi_device *spi) int err; spi->bits_per_word = 8; - spi->mode = SPI_MODE_0; spi->rt = true; err = spi_setup(spi); if (err < 0)
There isn't any need to overwrite the mode here in the driver with what has been detected by the firmware, such as DT or ACPI. In fact, if we use the SPI CS gpio descriptor feature we will overwrite the mode with SPI_MODE_0 where it already contains SPI_MODE_0 and more importantly SPI_CS_HIGH. Clearing the SPI_CS_HIGH bit causes the CS line to toggle when the device is probed when it shouldn't change, confusing the driver and making it fail to probe. Drop the assignment and let the spi core take care of it. Fixes: a17d94f0b6e1 ("mfd: Add ChromeOS EC SPI driver") Cc: Simon Glass <sjg@chromium.org> Cc: Gwendal Grignou <gwendal@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Tested-by: Douglas Anderson <dianders@chromium.org> Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Cc: Alexandru M Stan <amstan@chromium.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> --- drivers/platform/chrome/cros_ec_spi.c | 1 - 1 file changed, 1 deletion(-)