On Mon, 2020-04-27 at 12:20 +0000, Eugen.Hristev@xxxxxxxxxxxxx wrote: > [External] > > On 15.04.2020 09:33, Ardelean, Alexandru wrote: > > > On Tue, 2020-04-14 at 18:45 +0100, Jonathan Cameron wrote: > > > On Tue, 14 Apr 2020 12:22:45 +0000 > > > <Eugen.Hristev@xxxxxxxxxxxxx> wrote: > > > > > > > On 13.04.2020 20:05, Jonathan Cameron wrote: > > > > > On Wed, 4 Mar 2020 10:42:18 +0200 > > > > > Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> wrote: > > > > > > > > > > > This change moves the logic to check if the current channel is the > > > > > > touchscreen channel to a separate helper. > > > > > > This reduces some code duplication, but the main intent is to re-use > > > > > > this > > > > > > in the next patches. > > > > > > > > > > > > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> > > > > > Eugen / Ludovic, > > > > > > > > > > Have you had a chance to look at this series? > > > > > > > > Hi Jonathan, > > > > > > > > Does the patch apply correctly for you ? > > > > > > I haven't tried yet :) > > > > > > > I've rebased this patchset on top of current iio/testing and it still > > applies. > > > > Hi Alex, > > I tried this patch on top of my tree (however I am testing with an older > kernel 5.4) , and I have issues starting the buffer after you moved my > code to the preenable callback. > > Namely, on the line: > > if (!(indio_dev->currentmode & INDIO_ALL_TRIGGERED_MODES)) > return -EINVAL; Apologies for the breakage. For the touch-part I don't see that code being executed. But a question is: does the driver need to check for the currentmode? Or is that something that the IIO core should do? > > And with this , the preenable fails on my side, because the current mode > is not yet switched to triggered. > > I do remember adding this line with a specific reason. It may be related > to touchscreen operations, but I have to retest the touch with and > without this line and your patch. > > Meanwhile, maybe you have any suggestions on how to fix the buffer ? Well, there was the question of whether iio_triggered_buffer_postenable() [to attach the pollfunc] makes sense to be called first/last in the old at91_adc_buffer_postenable(), and the answer was 'last'; so then one solution was to move things to preenable(). Going back to the old patch isn't ideal, as the idea was to make the position of iio_triggered_buffer_postenable() consistent across all drivers, so that it can be removed [and moved to the IIO core]. But if we need revert the patch, then I guess it's fine. The only solution I see right now [for going forward], is to remove that check for 'currrentmode' > This check here makes any sense to you ? I think Jonathan may have to add some input here, but I think that in this current situation, checking 'currentmode' looks like is re-validating how the device was configured via the IIO framework. I am not sure if it's needed or not. > > Thanks, > Eugen > > > > > I will try to test it , if I manage to apply it. > > > > I can only test the ADC though because at this moment I do not have a > > > > touchscreen at disposal. > > > > > > > > Meanwhile, the code looks good for me, > > > > > > > > Reviewed-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx> > > > > > > > > By the way, I do not know if my two pending patches on this driver will > > > > conflict or not. > > > > > > As this is a long term rework patch at heart, there isn't any particular > > > rush as long as we don't loose it forever! > > > > > > Thanks, > > > > > > Jonathan > > > > > > > Eugen > > > > > > > > > Thanks, > > > > > > > > > > Jonathan > > > > > > > > > > > --- > > > > > > > > > > > > This patchset continues discussion: > > > > > > > > > > > > https://urldefense.com/v3/__https://lore.kernel.org/linux-iio/20191023082508.17583-1-alexandru.ardelean@xxxxxxxxxx/__;!!A3Ni8CS0y2Y!ql1bYiNMPFlz1twnCCAQpiEBvpzxR_VHAPL712rWFfwy2TSKjZ2UhGBoV7-29Syny6z0yg$ > > > > > > > > > > > > Apologies for the delay. > > > > > > > > > > > > Changelog v1 -> v2: > > > > > > * added patch 'iio: at91-sama5d2_adc: split > > > > > > at91_adc_current_chan_is_touch() > > > > > > helper' > > > > > > * renamed at91_adc_buffer_postenable() -> > > > > > > at91_adc_buffer_preenable() > > > > > > - at91_adc_buffer_postenable() - now just calls > > > > > > iio_triggered_buffer_postenable() if the channel isn't the > > > > > > touchscreen > > > > > > channel > > > > > > * renamed at91_adc_buffer_predisable() -> > > > > > > at91_adc_buffer_postdisable() > > > > > > - at91_adc_buffer_predisable() - now just calls > > > > > > iio_triggered_buffer_predisable() if the channel isn't the > > > > > > touchscreen > > > > > > channel > > > > > > > > > > > > drivers/iio/adc/at91-sama5d2_adc.c | 31 +++++++++++++++-------- > > > > > > ------- > > > > > > 1 file changed, 15 insertions(+), 16 deletions(-) > > > > > > > > > > > > diff --git a/drivers/iio/adc/at91-sama5d2_adc.c > > > > > > b/drivers/iio/adc/at91- > > > > > > sama5d2_adc.c > > > > > > index a5c7771227d5..f2a74c47c768 100644 > > > > > > --- a/drivers/iio/adc/at91-sama5d2_adc.c > > > > > > +++ b/drivers/iio/adc/at91-sama5d2_adc.c > > > > > > @@ -873,18 +873,24 @@ static int at91_adc_dma_start(struct iio_dev > > > > > > *indio_dev) > > > > > > return 0; > > > > > > } > > > > > > > > > > > > +static bool at91_adc_current_chan_is_touch(struct iio_dev > > > > > > *indio_dev) > > > > > > +{ > > > > > > + struct at91_adc_state *st = iio_priv(indio_dev); > > > > > > + > > > > > > + return !!bitmap_subset(indio_dev->active_scan_mask, > > > > > > + &st->touch_st.channels_bitmask, > > > > > > + AT91_SAMA5D2_MAX_CHAN_IDX + 1); > > > > > > +} > > > > > > + > > > > > > static int at91_adc_buffer_postenable(struct iio_dev *indio_dev) > > > > > > { > > > > > > int ret; > > > > > > struct at91_adc_state *st = iio_priv(indio_dev); > > > > > > > > > > > > /* check if we are enabling triggered buffer or the > > > > > > touchscreen > > > > > > */ > > > > > > - if (bitmap_subset(indio_dev->active_scan_mask, > > > > > > - &st->touch_st.channels_bitmask, > > > > > > - AT91_SAMA5D2_MAX_CHAN_IDX + 1)) { > > > > > > - /* touchscreen enabling */ > > > > > > + if (at91_adc_current_chan_is_touch(indio_dev)) > > > > > > return at91_adc_configure_touch(st, true); > > > > > > - } > > > > > > + > > > > > > /* if we are not in triggered mode, we cannot enable the > > > > > > buffer. > > > > > > */ > > > > > > if (!(indio_dev->currentmode & INDIO_ALL_TRIGGERED_MODES)) > > > > > > return -EINVAL; > > > > > > @@ -906,12 +912,9 @@ static int at91_adc_buffer_predisable(struct > > > > > > iio_dev *indio_dev) > > > > > > u8 bit; > > > > > > > > > > > > /* check if we are disabling triggered buffer or the > > > > > > touchscreen > > > > > > */ > > > > > > - if (bitmap_subset(indio_dev->active_scan_mask, > > > > > > - &st->touch_st.channels_bitmask, > > > > > > - AT91_SAMA5D2_MAX_CHAN_IDX + 1)) { > > > > > > - /* touchscreen disable */ > > > > > > + if (at91_adc_current_chan_is_touch(indio_dev)) > > > > > > return at91_adc_configure_touch(st, false); > > > > > > - } > > > > > > + > > > > > > /* if we are not in triggered mode, nothing to do here */ > > > > > > if (!(indio_dev->currentmode & INDIO_ALL_TRIGGERED_MODES)) > > > > > > return -EINVAL; > > > > > > @@ -1886,14 +1889,10 @@ static __maybe_unused int > > > > > > at91_adc_resume(struct > > > > > > device *dev) > > > > > > return 0; > > > > > > > > > > > > /* check if we are enabling triggered buffer or the > > > > > > touchscreen > > > > > > */ > > > > > > - if (bitmap_subset(indio_dev->active_scan_mask, > > > > > > - &st->touch_st.channels_bitmask, > > > > > > - AT91_SAMA5D2_MAX_CHAN_IDX + 1)) { > > > > > > - /* touchscreen enabling */ > > > > > > + if (at91_adc_current_chan_is_touch(indio_dev)) > > > > > > return at91_adc_configure_touch(st, true); > > > > > > - } else { > > > > > > + else > > > > > > return at91_adc_configure_trigger(st->trig, true); > > > > > > - } > > > > > > > > > > > > /* not needed but more explicit */ > > > > > > return 0;
