From: Gwendal Grignou <gwendal@chromium.org> stable inclusion from stable-v5.10.85 commit fff92f3712d771103ca967dc8cb1180e5a48078a bugzilla: 186032 https://gitee.com/openeuler/kernel/issues/I4QVI4 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 652e7df485c6884d552085ae2c73efa6cfea3547 upstream. Use scan_type when processing raw data which also fixes that the sign extension was from the wrong bit. Use channel definition as root of trust and replace constant when reading elements directly using the raw sysfs attributes. Fixes: 6794e23fa3fe ("iio: adc: at91-sama5d2_adc: add support for oversampling resolution") Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-by: Eugen Hristev <eugen.hristev@microchip.com> Cc: <Stable@vger.kernel.org> Link: https://lore.kernel.org/r/20211104082413.3681212-9-gwendal@chromium.org Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Chen Jun <chenjun102@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- drivers/iio/adc/at91-sama5d2_adc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c index b8139c435a4b..4ede7e766765 100644 --- a/drivers/iio/adc/at91-sama5d2_adc.c +++ b/drivers/iio/adc/at91-sama5d2_adc.c @@ -1401,7 +1401,8 @@ static int at91_adc_read_info_raw(struct iio_dev *indio_dev, *val = st->conversion_value; ret = at91_adc_adjust_val_osr(st, val); if (chan->scan_type.sign == 's') - *val = sign_extend32(*val, 11); + *val = sign_extend32(*val, + chan->scan_type.realbits - 1); st->conversion_done = false; } -- 2.20.1