3.13.11.9 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Ludovic Desroches <ludovic.desroc...@atmel.com>
commit d4f51956ac8ad302db9b0c4e4232775b1baa7b44 upstream.
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.
Signed-off-by: Ludovic Desroches <ludovic.desroc...@atmel.com>
Acked-by: Alexandre Belloni <alexandre.bell...@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.fe...@atmel.com>
Signed-off-by: Jonathan Cameron <ji...@kernel.org>
[ kamal: backport to 3.13-stable: no _9x5_interrupt handler ]
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
drivers/iio/adc/at91_adc.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index e6bf77d..059946e 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -78,6 +78,7 @@ struct at91_adc_state {
bool done;
int irq;
u16 last_value;
+ int chnb;
struct mutex lock;
u8 num_channels;
void __iomem *reg_base;
@@ -151,7 +152,7 @@ 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);
}
@@ -230,7 +231,7 @@ static irqreturn_t at91_adc_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 - 1, 0))
handle_adc_eoc_trigger(irq, idev);
if (status & AT91_ADC_IER_PEN) {
@@ -501,9 +502,10 @@ 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,
@@ -520,7 +522,7 @@ 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;
--
1.9.1
--
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