V4L/DVB: mx2_camera: implement forced termination of active buffer for mx25

This allows userspace to terminate a capture without waiting for the current
frame to complete.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/mx2_camera.c b/drivers/media/video/mx2_camera.c
index 2560e77..d7b3229 100644 (file)
--- a/drivers/media/video/mx2_camera.c
+++ b/drivers/media/video/mx2_camera.c
@@ -640,15 +640,27 @@ static void mx2_videobuf_release(struct videobuf_queue *vq,
         * Terminate only queued but inactive buffers. Active buffers are
         * released when they become inactive after videobuf_waiton().
         *
-        * FIXME: implement forced termination of active buffers, so that the
-        * user won't get stuck in an uninterruptible state. This requires a
-        * specific handling for each of the three DMA types that this driver
-        * supports.
+        * FIXME: implement forced termination of active buffers for mx27 and
+        * mx27 eMMA, so that the user won't get stuck in an uninterruptible
+        * state. This requires a specific handling for each of the these DMA
+        * types.
         */
        spin_lock_irqsave(&pcdev->lock, flags);
        if (vb->state == VIDEOBUF_QUEUED) {
                list_del(&vb->queue);
                vb->state = VIDEOBUF_ERROR;
+       } else if (cpu_is_mx25() && vb->state == VIDEOBUF_ACTIVE) {
+               if (pcdev->fb1_active == buf) {
+                       pcdev->csicr1 &= ~CSICR1_FB1_DMA_INTEN;
+                       writel(0, pcdev->base_csi + CSIDMASA_FB1);
+                       pcdev->fb1_active = NULL;
+               } else if (pcdev->fb2_active == buf) {
+                       pcdev->csicr1 &= ~CSICR1_FB2_DMA_INTEN;
+                       writel(0, pcdev->base_csi + CSIDMASA_FB2);
+                       pcdev->fb2_active = NULL;
+               }
+               writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
+               vb->state = VIDEOBUF_ERROR;
        }
        spin_unlock_irqrestore(&pcdev->lock, flags);