From 89bb35e200bee745c539a96666e0792301ca40f1 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Kristina=20Mart=C5=A1enko?= Date: Sun, 25 Jan 2015 18:28:22 +0200 Subject: [PATCH] iio: mxs-lradc: only update the buffer when its conversions have finished MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Using the touchscreen while running buffered capture results in the buffer reporting lots of wrong values, often just zeros. This is because we push readings to the buffer every time a touchscreen interrupt arrives, including when the buffer's own conversions have not yet finished. So let's only push to the buffer when its conversions are ready. Signed-off-by: Kristina Martšenko Reviewed-by: Marek Vasut Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron --- drivers/staging/iio/adc/mxs-lradc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c index d2e0c275bf4d..ebcbd12d48b9 100644 --- a/drivers/staging/iio/adc/mxs-lradc.c +++ b/drivers/staging/iio/adc/mxs-lradc.c @@ -1152,10 +1152,12 @@ static irqreturn_t mxs_lradc_handle_irq(int irq, void *data) LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2)); } - if (iio_buffer_enabled(iio)) - iio_trigger_poll(iio->trig); - else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) + if (iio_buffer_enabled(iio)) { + if (reg & lradc->buffer_vchans) + iio_trigger_poll(iio->trig); + } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) { complete(&lradc->completion); + } mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1); -- 2.11.0