From: <Eugen.Hristev@microchip.com> To: <jic23@kernel.org>, <alexandru.ardelean@analog.com> Cc: <linux-iio@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <alexandre.belloni@bootlin.com>, <Nicolas.Ferre@microchip.com>, <Ludovic.Desroches@microchip.com> Subject: Re: [PATCH] iio: at91-sama5d2_adc: remove usage of iio_priv_to_dev() helper Date: Wed, 17 Jun 2020 13:25:43 +0000 [thread overview] Message-ID: <8caaa1f8-ebbe-50ab-a655-d5c487c9a751@microchip.com> (raw) In-Reply-To: <20200531153908.47ccbc37@archlinux> On 31.05.2020 17:39, Jonathan Cameron wrote: > On Mon, 25 May 2020 13:53:41 +0300 > Alexandru Ardelean <alexandru.ardelean@analog.com> wrote: > >> 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. >> >> 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. >> >> 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. >> >> 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). > > 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. Hi, 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 ?) Eugen > > Poke me if no action in a few weeks. > > Thanks, > > Jonathan > >> >> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> >> --- >> drivers/iio/adc/at91-sama5d2_adc.c | 30 +++++++++++++++++------------- >> 1 file changed, 17 insertions(+), 13 deletions(-) >> >> 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_HWORDS]; >> /* >> * 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 = 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"); >> >> pos = val & AT91_SAMA5D2_XYZ_MASK; >> result = (pos << AT91_SAMA5D2_MAX_POS_BITS) - pos; >> scale = (val >> 16) & AT91_SAMA5D2_XYZ_MASK; >> if (scale == 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 /= scale; >> @@ -1204,9 +1205,9 @@ static unsigned at91_adc_startup_time(unsigned startup_time_min, >> return i; >> } >> >> -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 = iio_priv_to_dev(st); >> + struct at91_adc_state *st = iio_priv(indio_dev); >> unsigned f_per, prescal, startup, mr; >> >> f_per = 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 = true; >> } >> >> -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 = iio_priv_to_dev(st); >> + struct at91_adc_state *st = iio_priv(indio_dev); >> >> 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 = container_of(touch_st, >> struct at91_adc_state, touch_st); >> - struct iio_dev *indio_dev = iio_priv_to_dev(st); >> + struct iio_dev *indio_dev = st->indio_dev; >> >> 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) == 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; >> >> - 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; >> } >> >> -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 = 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); >> >> - at91_adc_setup_samp_freq(st, st->soc_info.min_sample_rate); >> + at91_adc_setup_samp_freq(indio_dev, st->soc_info.min_sample_rate); >> >> /* 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 = ARRAY_SIZE(at91_adc_channels); >> >> st = iio_priv(indio_dev); >> + st->indio_dev = indio_dev; >> >> 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; >> } >> >> - at91_adc_hw_init(st); >> + at91_adc_hw_init(indio_dev); >> >> ret = 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; >> >> - at91_adc_hw_init(st); >> + at91_adc_hw_init(indio_dev); >> >> /* reconfiguring trigger hardware state */ >> if (!iio_buffer_enabled(indio_dev)) >
WARNING: multiple messages have this Message-ID (diff)
From: <Eugen.Hristev@microchip.com> To: <jic23@kernel.org>, <alexandru.ardelean@analog.com> Cc: alexandre.belloni@bootlin.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Ludovic.Desroches@microchip.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH] iio: at91-sama5d2_adc: remove usage of iio_priv_to_dev() helper Date: Wed, 17 Jun 2020 13:25:43 +0000 [thread overview] Message-ID: <8caaa1f8-ebbe-50ab-a655-d5c487c9a751@microchip.com> (raw) In-Reply-To: <20200531153908.47ccbc37@archlinux> On 31.05.2020 17:39, Jonathan Cameron wrote: > On Mon, 25 May 2020 13:53:41 +0300 > Alexandru Ardelean <alexandru.ardelean@analog.com> wrote: > >> 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. >> >> 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. >> >> 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. >> >> 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). > > 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. Hi, 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 ?) Eugen > > Poke me if no action in a few weeks. > > Thanks, > > Jonathan > >> >> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> >> --- >> drivers/iio/adc/at91-sama5d2_adc.c | 30 +++++++++++++++++------------- >> 1 file changed, 17 insertions(+), 13 deletions(-) >> >> 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_HWORDS]; >> /* >> * 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 = 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"); >> >> pos = val & AT91_SAMA5D2_XYZ_MASK; >> result = (pos << AT91_SAMA5D2_MAX_POS_BITS) - pos; >> scale = (val >> 16) & AT91_SAMA5D2_XYZ_MASK; >> if (scale == 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 /= scale; >> @@ -1204,9 +1205,9 @@ static unsigned at91_adc_startup_time(unsigned startup_time_min, >> return i; >> } >> >> -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 = iio_priv_to_dev(st); >> + struct at91_adc_state *st = iio_priv(indio_dev); >> unsigned f_per, prescal, startup, mr; >> >> f_per = 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 = true; >> } >> >> -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 = iio_priv_to_dev(st); >> + struct at91_adc_state *st = iio_priv(indio_dev); >> >> 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 = container_of(touch_st, >> struct at91_adc_state, touch_st); >> - struct iio_dev *indio_dev = iio_priv_to_dev(st); >> + struct iio_dev *indio_dev = st->indio_dev; >> >> 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) == 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; >> >> - 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; >> } >> >> -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 = 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); >> >> - at91_adc_setup_samp_freq(st, st->soc_info.min_sample_rate); >> + at91_adc_setup_samp_freq(indio_dev, st->soc_info.min_sample_rate); >> >> /* 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 = ARRAY_SIZE(at91_adc_channels); >> >> st = iio_priv(indio_dev); >> + st->indio_dev = indio_dev; >> >> 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; >> } >> >> - at91_adc_hw_init(st); >> + at91_adc_hw_init(indio_dev); >> >> ret = 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; >> >> - at91_adc_hw_init(st); >> + at91_adc_hw_init(indio_dev); >> >> /* reconfiguring trigger hardware state */ >> if (!iio_buffer_enabled(indio_dev)) > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-06-17 13:25 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-25 10:53 [PATCH] iio: at91-sama5d2_adc: remove usage of iio_priv_to_dev() helper Alexandru Ardelean 2020-05-25 10:53 ` Alexandru Ardelean 2020-05-31 14:39 ` Jonathan Cameron 2020-05-31 14:39 ` Jonathan Cameron 2020-06-17 13:25 ` Eugen.Hristev [this message] 2020-06-17 13:25 ` Eugen.Hristev 2020-06-17 14:02 ` Ardelean, Alexandru 2020-06-17 14:02 ` Ardelean, Alexandru 2020-06-18 12:47 ` Eugen.Hristev 2020-06-18 12:47 ` Eugen.Hristev 2020-06-18 13:34 ` Ardelean, Alexandru 2020-06-18 13:34 ` Ardelean, Alexandru 2020-06-20 16:31 ` Jonathan Cameron 2020-06-20 16:31 ` Jonathan Cameron
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