From: Ludovic Desroches <ludovic.desroches@atmel.com> To: <linux-arm-kernel@lists.infradead.org>, <linux-iio@vger.kernel.org> Cc: <jic23@kernel.org>, <alexandre.belloni@free-electrons.com>, <josh.wu@atmel.com>, <nicolas.ferre@atmel.com>, <maxime.ripard@free-electrons.com>, <knaack.h@gmx.de>, Ludovic Desroches <ludovic.desroches@atmel.com> Subject: [PATCH v2] iio: adc: at91: don't use the last converted data register Date: Mon, 8 Sep 2014 10:40:31 +0200 [thread overview] Message-ID: <1410165631-8688-1-git-send-email-ludovic.desroches@atmel.com> (raw) If touchscreen mode is enabled and a conversion is requested on another channel, the result in the last converted data register can be a touchscreen relative value. Starting a conversion involves to do a conversion for all active channel. It starts with ADC channels and ends with touchscreen channels. Then if ADC_LCD register is not read quickly, its content may be a touchscreen conversion. To remove this temporal constraint, the conversion value is taken from the channel data register. Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> --- Changes from v1: - use GENMASK and BIT macros drivers/iio/adc/at91_adc.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c index 3b5bacd..1812d12 100644 --- a/drivers/iio/adc/at91_adc.c +++ b/drivers/iio/adc/at91_adc.c @@ -196,6 +196,7 @@ struct at91_adc_state { bool done; int irq; u16 last_value; + int chnb; struct mutex lock; u8 num_channels; void __iomem *reg_base; @@ -274,7 +275,7 @@ void handle_adc_eoc_trigger(int irq, struct iio_dev *idev) disable_irq_nosync(irq); iio_trigger_poll(idev->trig, iio_get_time_ns()); } else { - st->last_value = at91_adc_readl(st, AT91_ADC_LCDR); + st->last_value = at91_adc_readl(st, AT91_ADC_CHAN(st, st->chnb)); st->done = true; wake_up_interruptible(&st->wq_data_avail); } @@ -351,7 +352,7 @@ static irqreturn_t at91_adc_rl_interrupt(int irq, void *private) unsigned int reg; status &= at91_adc_readl(st, AT91_ADC_IMR); - if (status & st->registers->drdy_mask) + if (status & GENMASK(st->num_channels, 0)) handle_adc_eoc_trigger(irq, idev); if (status & AT91RL_ADC_IER_PEN) { @@ -418,7 +419,7 @@ static irqreturn_t at91_adc_9x5_interrupt(int irq, void *private) AT91_ADC_IER_YRDY | AT91_ADC_IER_PRDY; - if (status & st->registers->drdy_mask) + if (status & GENMASK(st->num_channels, 0)) handle_adc_eoc_trigger(irq, idev); if (status & AT91_ADC_IER_PEN) { @@ -689,9 +690,10 @@ static int at91_adc_read_raw(struct iio_dev *idev, case IIO_CHAN_INFO_RAW: mutex_lock(&st->lock); + st->chnb = chan->channel; at91_adc_writel(st, AT91_ADC_CHER, AT91_ADC_CH(chan->channel)); - at91_adc_writel(st, AT91_ADC_IER, st->registers->drdy_mask); + at91_adc_writel(st, AT91_ADC_IER, BIT(chan->channel)); at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_START); ret = wait_event_interruptible_timeout(st->wq_data_avail, @@ -708,7 +710,7 @@ static int at91_adc_read_raw(struct iio_dev *idev, at91_adc_writel(st, AT91_ADC_CHDR, AT91_ADC_CH(chan->channel)); - at91_adc_writel(st, AT91_ADC_IDR, st->registers->drdy_mask); + at91_adc_writel(st, AT91_ADC_IDR, BIT(chan->channel)); st->last_value = 0; st->done = false; -- 1.7.9.5
WARNING: multiple messages have this Message-ID (diff)
From: ludovic.desroches@atmel.com (Ludovic Desroches) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2] iio: adc: at91: don't use the last converted data register Date: Mon, 8 Sep 2014 10:40:31 +0200 [thread overview] Message-ID: <1410165631-8688-1-git-send-email-ludovic.desroches@atmel.com> (raw) If touchscreen mode is enabled and a conversion is requested on another channel, the result in the last converted data register can be a touchscreen relative value. Starting a conversion involves to do a conversion for all active channel. It starts with ADC channels and ends with touchscreen channels. Then if ADC_LCD register is not read quickly, its content may be a touchscreen conversion. To remove this temporal constraint, the conversion value is taken from the channel data register. Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> --- Changes from v1: - use GENMASK and BIT macros drivers/iio/adc/at91_adc.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c index 3b5bacd..1812d12 100644 --- a/drivers/iio/adc/at91_adc.c +++ b/drivers/iio/adc/at91_adc.c @@ -196,6 +196,7 @@ struct at91_adc_state { bool done; int irq; u16 last_value; + int chnb; struct mutex lock; u8 num_channels; void __iomem *reg_base; @@ -274,7 +275,7 @@ void handle_adc_eoc_trigger(int irq, struct iio_dev *idev) disable_irq_nosync(irq); iio_trigger_poll(idev->trig, iio_get_time_ns()); } else { - st->last_value = at91_adc_readl(st, AT91_ADC_LCDR); + st->last_value = at91_adc_readl(st, AT91_ADC_CHAN(st, st->chnb)); st->done = true; wake_up_interruptible(&st->wq_data_avail); } @@ -351,7 +352,7 @@ static irqreturn_t at91_adc_rl_interrupt(int irq, void *private) unsigned int reg; status &= at91_adc_readl(st, AT91_ADC_IMR); - if (status & st->registers->drdy_mask) + if (status & GENMASK(st->num_channels, 0)) handle_adc_eoc_trigger(irq, idev); if (status & AT91RL_ADC_IER_PEN) { @@ -418,7 +419,7 @@ static irqreturn_t at91_adc_9x5_interrupt(int irq, void *private) AT91_ADC_IER_YRDY | AT91_ADC_IER_PRDY; - if (status & st->registers->drdy_mask) + if (status & GENMASK(st->num_channels, 0)) handle_adc_eoc_trigger(irq, idev); if (status & AT91_ADC_IER_PEN) { @@ -689,9 +690,10 @@ static int at91_adc_read_raw(struct iio_dev *idev, case IIO_CHAN_INFO_RAW: mutex_lock(&st->lock); + st->chnb = chan->channel; at91_adc_writel(st, AT91_ADC_CHER, AT91_ADC_CH(chan->channel)); - at91_adc_writel(st, AT91_ADC_IER, st->registers->drdy_mask); + at91_adc_writel(st, AT91_ADC_IER, BIT(chan->channel)); at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_START); ret = wait_event_interruptible_timeout(st->wq_data_avail, @@ -708,7 +710,7 @@ static int at91_adc_read_raw(struct iio_dev *idev, at91_adc_writel(st, AT91_ADC_CHDR, AT91_ADC_CH(chan->channel)); - at91_adc_writel(st, AT91_ADC_IDR, st->registers->drdy_mask); + at91_adc_writel(st, AT91_ADC_IDR, BIT(chan->channel)); st->last_value = 0; st->done = false; -- 1.7.9.5
next reply other threads:[~2014-09-08 8:40 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-09-08 8:40 Ludovic Desroches [this message] 2014-09-08 8:40 ` [PATCH v2] iio: adc: at91: don't use the last converted data register Ludovic Desroches 2014-09-09 21:54 ` Hartmut Knaack 2014-09-09 21:54 ` Hartmut Knaack 2014-09-10 11:53 ` Ludovic Desroches 2014-09-10 11:53 ` Ludovic Desroches
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