iio: imu: st_lsm6dsx: fix edge-trigger interrupts

commit 3f9bce7a22a3f8ac9d885c9d75bc45569f24ac8b upstream

If we are using edge IRQs, new samples can arrive while processing
current interrupt since there are no hw guarantees the irq line
stays "low" long enough to properly detect the new interrupt.
In this case the new sample will be missed.
Polling FIFO status register in st_lsm6dsx_handler_thread routine
allow us to read new samples even if the interrupt arrives while
processing previous data and the timeslot where the line is "low"
is too short to be properly detected.

Fixes: 89ca88a7cdf2 ("iio: imu: st_lsm6dsx: support active-low interrupts")
Fixes: 290a6ce11d93 ("iio: imu: add support to lsm6dsx driver")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/5e93cda7dc1e665f5685c53ad8e9ea71dbae782d.1605378871.git.lorenzo@kernel.org
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
[sudip: manual backport to old irq handler path]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
index 8974d7ba657b348154326afc0e5d72e9e64f3b15..4d89de0be58b8a259c4eba0044d88e45bb0e88b0 100644 (file)
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
@@ -475,13 +475,29 @@ static irqreturn_t st_lsm6dsx_handler_irq(int irq, void *private)
 static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
 {
        struct st_lsm6dsx_hw *hw = private;
-       int count;
+       int fifo_len = 0, len;
 
-       mutex_lock(&hw->fifo_lock);
-       count = st_lsm6dsx_read_fifo(hw);
-       mutex_unlock(&hw->fifo_lock);
+       /*
+        * If we are using edge IRQs, new samples can arrive while
+        * processing current interrupt since there are no hw
+        * guarantees the irq line stays "low" long enough to properly
+        * detect the new interrupt. In this case the new sample will
+        * be missed.
+        * Polling FIFO status register allow us to read new
+        * samples even if the interrupt arrives while processing
+        * previous data and the timeslot where the line is "low" is
+        * too short to be properly detected.
+        */
+       do {
+               mutex_lock(&hw->fifo_lock);
+               len = st_lsm6dsx_read_fifo(hw);
+               mutex_unlock(&hw->fifo_lock);
+
+               if (len > 0)
+                       fifo_len += len;
+       } while (len > 0);
 
-       return count ? IRQ_HANDLED : IRQ_NONE;
+       return fifo_len ? IRQ_HANDLED : IRQ_NONE;
 }
 
 static int st_lsm6dsx_buffer_preenable(struct iio_dev *iio_dev)