According to the AD9832 datasheet (Table 10, D12 description), setting the RESET bit forces the phase accumulator to zero, which corresponds to a full-scale DC output, rather than disabling the output signal.
The correct way to disable the output and enter a low-power state is to set the AD9832_SLEEP bit (Table 10, D13 description), which powers down the internal DAC current sources and disables internal clocks.
Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver") Cc: stable@vger.kernel.org Signed-off-by: Gabriel Shahrouzi gshahrouzi@gmail.com --- drivers/staging/iio/frequency/ad9832.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c index db42810c7664b..0872ff4ec4896 100644 --- a/drivers/staging/iio/frequency/ad9832.c +++ b/drivers/staging/iio/frequency/ad9832.c @@ -232,7 +232,7 @@ static ssize_t ad9832_write(struct device *dev, struct device_attribute *attr, st->ctrl_src &= ~(AD9832_RESET | AD9832_SLEEP | AD9832_CLR); else - st->ctrl_src |= AD9832_RESET; + st->ctrl_src |= AD9832_SLEEP;
st->data = cpu_to_be16((AD9832_CMD_SLEEPRESCLR << CMD_SHIFT) | st->ctrl_src);
On Thu, 17 Apr 2025 09:54:34 -0400 Gabriel Shahrouzi gshahrouzi@gmail.com wrote:
According to the AD9832 datasheet (Table 10, D12 description), setting the RESET bit forces the phase accumulator to zero, which corresponds to a full-scale DC output, rather than disabling the output signal.
The correct way to disable the output and enter a low-power state is to set the AD9832_SLEEP bit (Table 10, D13 description), which powers down the internal DAC current sources and disables internal clocks.
Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver") Cc: stable@vger.kernel.org Signed-off-by: Gabriel Shahrouzi gshahrouzi@gmail.com
Seems reasonable but I'd like some more review of this before picking it up. So feel free to poke me if nothing happens in say 2 weeks from now.
drivers/staging/iio/frequency/ad9832.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c index db42810c7664b..0872ff4ec4896 100644 --- a/drivers/staging/iio/frequency/ad9832.c +++ b/drivers/staging/iio/frequency/ad9832.c @@ -232,7 +232,7 @@ static ssize_t ad9832_write(struct device *dev, struct device_attribute *attr, st->ctrl_src &= ~(AD9832_RESET | AD9832_SLEEP | AD9832_CLR); else
st->ctrl_src |= AD9832_RESET;
st->ctrl_src |= AD9832_SLEEP;st->data = cpu_to_be16((AD9832_CMD_SLEEPRESCLR << CMD_SHIFT) | st->ctrl_src);
On Fri, Apr 18, 2025 at 11:40 AM Jonathan Cameron jic23@kernel.org wrote:
On Thu, 17 Apr 2025 09:54:34 -0400 Gabriel Shahrouzi gshahrouzi@gmail.com wrote:
According to the AD9832 datasheet (Table 10, D12 description), setting the RESET bit forces the phase accumulator to zero, which corresponds to a full-scale DC output, rather than disabling the output signal.
The correct way to disable the output and enter a low-power state is to set the AD9832_SLEEP bit (Table 10, D13 description), which powers down the internal DAC current sources and disables internal clocks.
Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver") Cc: stable@vger.kernel.org Signed-off-by: Gabriel Shahrouzi gshahrouzi@gmail.com
Seems reasonable but I'd like some more review of this before picking it up. So feel free to poke me if nothing happens in say 2 weeks from now.
Sounds good.
drivers/staging/iio/frequency/ad9832.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c index db42810c7664b..0872ff4ec4896 100644 --- a/drivers/staging/iio/frequency/ad9832.c +++ b/drivers/staging/iio/frequency/ad9832.c @@ -232,7 +232,7 @@ static ssize_t ad9832_write(struct device *dev, struct device_attribute *attr, st->ctrl_src &= ~(AD9832_RESET | AD9832_SLEEP | AD9832_CLR); else
st->ctrl_src |= AD9832_RESET;
st->ctrl_src |= AD9832_SLEEP; st->data = cpu_to_be16((AD9832_CMD_SLEEPRESCLR << CMD_SHIFT) | st->ctrl_src);
On 04/17, Gabriel Shahrouzi wrote:
According to the AD9832 datasheet (Table 10, D12 description), setting the RESET bit forces the phase accumulator to zero, which corresponds to a full-scale DC output, rather than disabling the output signal.
The correct way to disable the output and enter a low-power state is to set the AD9832_SLEEP bit (Table 10, D13 description), which powers down the internal DAC current sources and disables internal clocks.
Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver") Cc: stable@vger.kernel.org Signed-off-by: Gabriel Shahrouzi gshahrouzi@gmail.com
Looks okay.
Reviewed-by: Marcelo Schmitt marcelo.schmitt1@gmail.com
Unrelated to this patch but, if anybody be looking to work on getting this out of staging, I think maybe this driver could use out_altvoltage_powerdown ABI instead of this custom out_altvoltageX_out_enable. Crazy thing this driver doesn't declare a single IIO channel. Seems to be somewhat ancient IIO driver.
Regards, Marcelo
On Sat, Apr 19, 2025 at 5:45 PM Marcelo Schmitt marcelo.schmitt1@gmail.com wrote:
On 04/17, Gabriel Shahrouzi wrote:
According to the AD9832 datasheet (Table 10, D12 description), setting the RESET bit forces the phase accumulator to zero, which corresponds to a full-scale DC output, rather than disabling the output signal.
The correct way to disable the output and enter a low-power state is to set the AD9832_SLEEP bit (Table 10, D13 description), which powers down the internal DAC current sources and disables internal clocks.
Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver") Cc: stable@vger.kernel.org Signed-off-by: Gabriel Shahrouzi gshahrouzi@gmail.com
Looks okay.
Reviewed-by: Marcelo Schmitt marcelo.schmitt1@gmail.com
Unrelated to this patch but, if anybody be looking to work on getting this out of staging, I think maybe this driver could use out_altvoltage_powerdown ABI instead of this custom out_altvoltageX_out_enable. Crazy thing this driver doesn't declare a single IIO channel. Seems to be somewhat ancient IIO driver.
I can start tackling this.
Regards, Marcelo
On Sat, 19 Apr 2025 21:41:50 -0400 Gabriel Shahrouzi gshahrouzi@gmail.com wrote:
On Sat, Apr 19, 2025 at 5:45 PM Marcelo Schmitt marcelo.schmitt1@gmail.com wrote:
On 04/17, Gabriel Shahrouzi wrote:
According to the AD9832 datasheet (Table 10, D12 description), setting the RESET bit forces the phase accumulator to zero, which corresponds to a full-scale DC output, rather than disabling the output signal.
The correct way to disable the output and enter a low-power state is to set the AD9832_SLEEP bit (Table 10, D13 description), which powers down the internal DAC current sources and disables internal clocks.
Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver") Cc: stable@vger.kernel.org Signed-off-by: Gabriel Shahrouzi gshahrouzi@gmail.com
Looks okay.
Reviewed-by: Marcelo Schmitt marcelo.schmitt1@gmail.com
Unrelated to this patch but, if anybody be looking to work on getting this out of staging, I think maybe this driver could use out_altvoltage_powerdown ABI instead of this custom out_altvoltageX_out_enable. Crazy thing this driver doesn't declare a single IIO channel. Seems to be somewhat ancient IIO driver.
I can start tackling this.
This has crossed with a series from Siddarth.
Take a look at what is in: https://web.git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/?h=...
Please rebase this one on top of that as I think the bug is still there?
Given there is work going on for this driver and the bugs are ancient, I'll not take any patches through the fixes tree for now. Instead I'll just queue them up for the next merge window.
Thanks,
Jonathan
Regards, Marcelo
On Mon, Apr 21, 2025 at 7:07 AM Jonathan Cameron jic23@kernel.org wrote:
On Sat, 19 Apr 2025 21:41:50 -0400 Gabriel Shahrouzi gshahrouzi@gmail.com wrote:
On Sat, Apr 19, 2025 at 5:45 PM Marcelo Schmitt marcelo.schmitt1@gmail.com wrote:
On 04/17, Gabriel Shahrouzi wrote:
According to the AD9832 datasheet (Table 10, D12 description), setting the RESET bit forces the phase accumulator to zero, which corresponds to a full-scale DC output, rather than disabling the output signal.
The correct way to disable the output and enter a low-power state is to set the AD9832_SLEEP bit (Table 10, D13 description), which powers down the internal DAC current sources and disables internal clocks.
Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver") Cc: stable@vger.kernel.org Signed-off-by: Gabriel Shahrouzi gshahrouzi@gmail.com
Looks okay.
Reviewed-by: Marcelo Schmitt marcelo.schmitt1@gmail.com
Unrelated to this patch but, if anybody be looking to work on getting this out of staging, I think maybe this driver could use out_altvoltage_powerdown ABI instead of this custom out_altvoltageX_out_enable. Crazy thing this driver doesn't declare a single IIO channel. Seems to be somewhat ancient IIO driver.
I can start tackling this.
This has crossed with a series from Siddarth.
Take a look at what is in: https://web.git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/?h=...
Please rebase this one on top of that as I think the bug is still there?
Got it. Yes, I believe it is still there.
Given there is work going on for this driver and the bugs are ancient, I'll not take any patches through the fixes tree for now. Instead I'll just queue them up for the next merge window.
Got it.
Thanks,
Jonathan
Regards, Marcelo
linux-stable-mirror@lists.linaro.org
-
Gabriel Shahrouzi -
Jonathan Cameron -
Marcelo Schmitt