From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B835DC433E0 for ; Sat, 20 Jun 2020 16:31:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 713E922BEF for ; Sat, 20 Jun 2020 16:31:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592670681; bh=XsBoFmyqrI0X41bqzm0ulNWNIF8Mgq5K7ulJ5WzhloI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=bfJhbXju5V/kI7tqdscRNGVv0JnP/iXUmIt4hE6E7ytyY7zwgNsftrCJ/e9B02HU1 qJa5z9hehoSpM9AFoLCop601Cb0eJMgYtrSmZgCjX4JGsOxiacZusMM+zoeOrC0qrl HpAeXgAJV1OYqNciySfrW1VDh8tdbJkM8cYMRc5U= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727012AbgFTQbV (ORCPT ); Sat, 20 Jun 2020 12:31:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:55670 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726043AbgFTQbT (ORCPT ); Sat, 20 Jun 2020 12:31:19 -0400 Received: from archlinux (cpc149474-cmbg20-2-0-cust94.5-4.cable.virginm.net [82.4.196.95]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3F2F322BEF; Sat, 20 Jun 2020 16:31:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592670677; bh=XsBoFmyqrI0X41bqzm0ulNWNIF8Mgq5K7ulJ5WzhloI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=zTf24Yy1FRDP68roOTqWJlGbaJzMxuVEQpfd//1TapJ0mW/que23appWJ5DrsAFRP bxKlrjipFPaQNV65gI31+r6AX2NdJ49FaNt7v72rMiO+kXeN/D8KRV+TrqB8JNClvi LQ9VaQJXpC9D9fS0W7Oc4H8OC6fVKZnnuE+ZBOeU= Date: Sat, 20 Jun 2020 17:31:12 +0100 From: Jonathan Cameron To: "Ardelean, Alexandru" Cc: "Eugen.Hristev@microchip.com" , "linux-arm-kernel@lists.infradead.org" , "Nicolas.Ferre@microchip.com" , "Ludovic.Desroches@microchip.com" , "linux-kernel@vger.kernel.org" , "linux-iio@vger.kernel.org" , "alexandre.belloni@bootlin.com" Subject: Re: [PATCH] iio: at91-sama5d2_adc: remove usage of iio_priv_to_dev() helper Message-ID: <20200620173112.1ae1e2dc@archlinux> In-Reply-To: References: <20200525105341.137945-1-alexandru.ardelean@analog.com> <20200531153908.47ccbc37@archlinux> <8caaa1f8-ebbe-50ab-a655-d5c487c9a751@microchip.com> <8c4c05458e32f56a5d8492482f9f5403feda1894.camel@analog.com> <272c7ba2-5d04-f241-de11-ab0512c25659@microchip.com> X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org On Thu, 18 Jun 2020 13:34:13 +0000 "Ardelean, Alexandru" wrote: > On Thu, 2020-06-18 at 12:47 +0000, Eugen.Hristev@microchip.com wrote: > > [External] > >=20 > > On 17.06.2020 17:02, Ardelean, Alexandru wrote: =20 > > > On Wed, 2020-06-17 at 13:25 +0000, Eugen.Hristev@microchip.com wrote:= =20 > > > > On 31.05.2020 17:39, Jonathan Cameron wrote: > > > > =20 > > > > > On Mon, 25 May 2020 13:53:41 +0300 > > > > > Alexandru Ardelean wrote: > > > > > =20 > > > > > > We may want to get rid of the iio_priv_to_dev() helper. The > > > > > > reason is that > > > > > > we will hide some of the members of the iio_dev structure (to > > > > > > prevent > > > > > > drivers from accessing them directly), and that will also mean > > > > > > hiding the > > > > > > implementation of the iio_priv_to_dev() helper inside the IIO > > > > > > core. > > > > > >=20 > > > > > > Hiding the implementation of iio_priv_to_dev() implies that some > > > > > > fast- > > > > > > paths > > > > > > may not be fast anymore, so a general idea is to try to get rid > > > > > > of the > > > > > > iio_priv_to_dev() altogether. > > > > > > The iio_priv() helper won't be affected by the rework, as the > > > > > > iio_dev > > > > > > struct will keep a reference to the private information. > > > > > >=20 > > > > > > For this driver, not using iio_priv_to_dev(), means reworking > > > > > > some paths > > > > > > to > > > > > > pass the iio device and using iio_priv() to access the private > > > > > > information, > > > > > > and also keeping a reference to the iio device for some quirky > > > > > > paths. > > > > > >=20 > > > > > > One [quirky] path is the at91_adc_workq_handler() which requires > > > > > > the IIO > > > > > > device & the state struct to push to buffers. > > > > > > Since this requires the back-ref to the IIO device, the > > > > > > at91_adc_touch_pos() also uses it. This simplifies the patch a > > > > > > bit. The > > > > > > information required in this function is mostly for debugging > > > > > > purposes. > > > > > > Replacing it with a reference to the IIO device would have been= a > > > > > > slightly > > > > > > bigger change, which may not be worth it (for just the debugging > > > > > > purpose > > > > > > and given that we need the back-ref to the IIO device anyway). = =20 > > > > >=20 > > > > > That workq is indeed quirky. This looks fine to me in general. > > > > > I'll > > > > > want an appropriate ack from the at91 side of things if possible = so > > > > > let's leave this on the list for a while longer. =20 > > > >=20 > > > > Hi, > > > >=20 > > > > I am available to test this patch, > > > > Can you tell me on which branch to apply it. On 5.8-rc1 it fails for > > > > me > > > > (or maybe it needs rebasing ?) > > > > =20 > > >=20 > > > Hmm, weird. > > > I rebased the patches on Jonathan's iio/testing. > > > It seemed to work. > > > https://urldefense.com/v3/__https://github.com/commodo/linux/commits/= iio-priv-to-dev__;!!A3Ni8CS0y2Y!oEVHsA6gf9ydBvAAjlhRV5QO1bMTZN2U_OXbor0gei7= mWk14m64rilJ2WTAXvtWmGaisXQ$=20 > > >=20 > > > As for which branch to test/apply. Not sure. > > > Maybe Jonathan's iio/testing as base? > > > Looks like it's based on 5.8. > > > =20 > >=20 > > Tested-by: Eugen Hristev > >=20 > > I have tested the major features of the driver (including the resistive= =20 > > touch) and it looks to be working fine. > >=20 > > I did not fully understand the quirkyness of the workq . Something you= =20 > > want to change to that ? =20 >=20 > Umm, not really. > I did not follow that code too in-depth. > And I would like not to. > Mostly to avoid scaling myself in too many directions. >=20 > There may be a slightly better approach to it, but =C2=AF\_(=E3=83=84)_/= =C2=AF I'm assuming no one minds me taking this as is. Applied to the togreg branch of iio.git first pushed out as testing for the autobuilders to play with it. Thanks, Jonathan >=20 > > =20 > > > > Eugen > > > > =20 > > > > > Poke me if no action in a few weeks. > > > > >=20 > > > > > Thanks, > > > > >=20 > > > > > Jonathan > > > > > =20 > > > > > > Signed-off-by: Alexandru Ardelean > > > > > > --- > > > > > > drivers/iio/adc/at91-sama5d2_adc.c | 30 +++++++++++++++++---= -- > > > > > > -------- > > > > > > 1 file changed, 17 insertions(+), 13 deletions(-) > > > > > >=20 > > > > > > diff --git a/drivers/iio/adc/at91-sama5d2_adc.c > > > > > > b/drivers/iio/adc/at91- > > > > > > sama5d2_adc.c > > > > > > index 9abbbdcc7420..7bce18444430 100644 > > > > > > --- a/drivers/iio/adc/at91-sama5d2_adc.c > > > > > > +++ b/drivers/iio/adc/at91-sama5d2_adc.c > > > > > > @@ -402,6 +402,7 @@ struct at91_adc_state { > > > > > > wait_queue_head_t wq_data_available; > > > > > > struct at91_adc_dma dma_st; > > > > > > struct at91_adc_touch touch_st; > > > > > > + struct iio_dev *indio_dev; > > > > > > u16 buffer[AT91_BUFFER_MAX_= HW > > > > > > ORDS]; > > > > > > /* > > > > > > * lock to prevent concurrent 'single conversion' > > > > > > requests through > > > > > > @@ -642,13 +643,13 @@ static u16 at91_adc_touch_pos(struct > > > > > > at91_adc_state > > > > > > *st, int reg) > > > > > > /* first half of register is the x or y, second half is > > > > > > the scale > > > > > > */ > > > > > > val =3D at91_adc_readl(st, reg); > > > > > > if (!val) > > > > > > - dev_dbg(&iio_priv_to_dev(st)->dev, "pos is 0\n"); > > > > > > + dev_dbg(&st->indio_dev->dev, "pos is 0\n"); > > > > > >=20 > > > > > > pos =3D val & AT91_SAMA5D2_XYZ_MASK; > > > > > > result =3D (pos << AT91_SAMA5D2_MAX_POS_BITS) - pos; > > > > > > scale =3D (val >> 16) & AT91_SAMA5D2_XYZ_MASK; > > > > > > if (scale =3D=3D 0) { > > > > > > - dev_err(&iio_priv_to_dev(st)->dev, "scale is 0\n"= ); > > > > > > + dev_err(&st->indio_dev->dev, "scale is 0\n"); > > > > > > return 0; > > > > > > } > > > > > > result /=3D scale; > > > > > > @@ -1204,9 +1205,9 @@ static unsigned > > > > > > at91_adc_startup_time(unsigned > > > > > > startup_time_min, > > > > > > return i; > > > > > > } > > > > > >=20 > > > > > > -static void at91_adc_setup_samp_freq(struct at91_adc_state *st, > > > > > > unsigned > > > > > > freq) > > > > > > +static void at91_adc_setup_samp_freq(struct iio_dev *indio_dev, > > > > > > unsigned > > > > > > freq) > > > > > > { > > > > > > - struct iio_dev *indio_dev =3D iio_priv_to_dev(st); > > > > > > + struct at91_adc_state *st =3D iio_priv(indio_dev); > > > > > > unsigned f_per, prescal, startup, mr; > > > > > >=20 > > > > > > f_per =3D clk_get_rate(st->per_clk); > > > > > > @@ -1275,9 +1276,9 @@ static void > > > > > > at91_adc_pen_detect_interrupt(struct > > > > > > at91_adc_state *st) > > > > > > st->touch_st.touching =3D true; > > > > > > } > > > > > >=20 > > > > > > -static void at91_adc_no_pen_detect_interrupt(struct > > > > > > at91_adc_state *st) > > > > > > +static void at91_adc_no_pen_detect_interrupt(struct iio_dev > > > > > > *indio_dev) > > > > > > { > > > > > > - struct iio_dev *indio_dev =3D iio_priv_to_dev(st); > > > > > > + struct at91_adc_state *st =3D iio_priv(indio_dev); > > > > > >=20 > > > > > > at91_adc_writel(st, AT91_SAMA5D2_TRGR, > > > > > > AT91_SAMA5D2_TRGR_TRGMOD_NO_TRIGGER); > > > > > > @@ -1297,7 +1298,7 @@ static void at91_adc_workq_handler(struct > > > > > > work_struct *workq) > > > > > > struct at91_adc_touch, > > > > > > workq); > > > > > > struct at91_adc_state *st =3D container_of(touch_st, > > > > > > struct at91_adc_state, > > > > > > touch_st); > > > > > > - struct iio_dev *indio_dev =3D iio_priv_to_dev(st); > > > > > > + struct iio_dev *indio_dev =3D st->indio_dev; > > > > > >=20 > > > > > > iio_push_to_buffers(indio_dev, st->buffer); > > > > > > } > > > > > > @@ -1318,7 +1319,7 @@ static irqreturn_t at91_adc_interrupt(int > > > > > > irq, void > > > > > > *private) > > > > > > at91_adc_pen_detect_interrupt(st); > > > > > > } else if ((status & AT91_SAMA5D2_IER_NOPEN)) { > > > > > > /* nopen detected IRQ */ > > > > > > - at91_adc_no_pen_detect_interrupt(st); > > > > > > + at91_adc_no_pen_detect_interrupt(indio); > > > > > > } else if ((status & AT91_SAMA5D2_ISR_PENS) && > > > > > > ((status & rdy_mask) =3D=3D rdy_mask)) { > > > > > > /* periodic trigger IRQ - during pen sense */ > > > > > > @@ -1486,7 +1487,7 @@ static int at91_adc_write_raw(struct > > > > > > iio_dev > > > > > > *indio_dev, > > > > > > val > st->soc_info.max_sample_rate) > > > > > > return -EINVAL; > > > > > >=20 > > > > > > - at91_adc_setup_samp_freq(st, val); > > > > > > + at91_adc_setup_samp_freq(indio_dev, val); > > > > > > return 0; > > > > > > default: > > > > > > return -EINVAL; > > > > > > @@ -1624,8 +1625,10 @@ static int > > > > > > at91_adc_update_scan_mode(struct iio_dev > > > > > > *indio_dev, > > > > > > return 0; > > > > > > } > > > > > >=20 > > > > > > -static void at91_adc_hw_init(struct at91_adc_state *st) > > > > > > +static void at91_adc_hw_init(struct iio_dev *indio_dev) > > > > > > { > > > > > > + struct at91_adc_state *st =3D iio_priv(indio_dev); > > > > > > + > > > > > > at91_adc_writel(st, AT91_SAMA5D2_CR, > > > > > > AT91_SAMA5D2_CR_SWRST); > > > > > > at91_adc_writel(st, AT91_SAMA5D2_IDR, 0xffffffff); > > > > > > /* > > > > > > @@ -1635,7 +1638,7 @@ static void at91_adc_hw_init(struct > > > > > > at91_adc_state > > > > > > *st) > > > > > > at91_adc_writel(st, AT91_SAMA5D2_MR, > > > > > > AT91_SAMA5D2_MR_TRANSFER(2) | > > > > > > AT91_SAMA5D2_MR_ANACH); > > > > > >=20 > > > > > > - at91_adc_setup_samp_freq(st, st->soc_info.min_sample_rate= ); > > > > > > + at91_adc_setup_samp_freq(indio_dev, st- =20 > > > > > > >soc_info.min_sample_rate); =20 > > > > > >=20 > > > > > > /* configure extended mode register */ > > > > > > at91_adc_config_emr(st); > > > > > > @@ -1718,6 +1721,7 @@ static int at91_adc_probe(struct > > > > > > platform_device > > > > > > *pdev) > > > > > > indio_dev->num_channels =3D ARRAY_SIZE(at91_adc_channel= s); > > > > > >=20 > > > > > > st =3D iio_priv(indio_dev); > > > > > > + st->indio_dev =3D indio_dev; > > > > > >=20 > > > > > > bitmap_set(&st->touch_st.channels_bitmask, > > > > > > AT91_SAMA5D2_TOUCH_X_CHAN_IDX, 1); > > > > > > @@ -1829,7 +1833,7 @@ static int at91_adc_probe(struct > > > > > > platform_device > > > > > > *pdev) > > > > > > goto vref_disable; > > > > > > } > > > > > >=20 > > > > > > - at91_adc_hw_init(st); > > > > > > + at91_adc_hw_init(indio_dev); > > > > > >=20 > > > > > > ret =3D clk_prepare_enable(st->per_clk); > > > > > > if (ret) > > > > > > @@ -1945,7 +1949,7 @@ static __maybe_unused int > > > > > > at91_adc_resume(struct > > > > > > device *dev) > > > > > > if (ret) > > > > > > goto vref_disable_resume; > > > > > >=20 > > > > > > - at91_adc_hw_init(st); > > > > > > + at91_adc_hw_init(indio_dev); > > > > > >=20 > > > > > > /* reconfiguring trigger hardware state */ > > > > > > if (!iio_buffer_enabled(indio_dev)) =20 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 036FBC433E1 for ; Sat, 20 Jun 2020 16:31:25 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C747B23AF8 for ; Sat, 20 Jun 2020 16:31:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="eWkQC8Ms"; dkim=fail reason="signature verification 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c=relaxed/simple; d=kernel.org; s=default; t=1592670677; bh=XsBoFmyqrI0X41bqzm0ulNWNIF8Mgq5K7ulJ5WzhloI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=zTf24Yy1FRDP68roOTqWJlGbaJzMxuVEQpfd//1TapJ0mW/que23appWJ5DrsAFRP bxKlrjipFPaQNV65gI31+r6AX2NdJ49FaNt7v72rMiO+kXeN/D8KRV+TrqB8JNClvi LQ9VaQJXpC9D9fS0W7Oc4H8OC6fVKZnnuE+ZBOeU= Date: Sat, 20 Jun 2020 17:31:12 +0100 From: Jonathan Cameron To: "Ardelean, Alexandru" Subject: Re: [PATCH] iio: at91-sama5d2_adc: remove usage of iio_priv_to_dev() helper Message-ID: <20200620173112.1ae1e2dc@archlinux> In-Reply-To: References: <20200525105341.137945-1-alexandru.ardelean@analog.com> <20200531153908.47ccbc37@archlinux> <8caaa1f8-ebbe-50ab-a655-d5c487c9a751@microchip.com> <8c4c05458e32f56a5d8492482f9f5403feda1894.camel@analog.com> <272c7ba2-5d04-f241-de11-ab0512c25659@microchip.com> X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 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