[PATCH v2 09/14] media: coda: wait for picture run completion in start/stop_streaming

[Philipp Zabel]

While the CODA is running a PIC_RUN command, its registers are
not to be touched.

Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
---
 drivers/media/video/coda.c |   34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/drivers/media/video/coda.c b/drivers/media/video/coda.c
index 3d47935..d41df26 100644
--- a/drivers/media/video/coda.c
+++ b/drivers/media/video/coda.c
@@ -138,6 +138,7 @@ struct coda_dev {
        struct list_head        instances;
        unsigned long           instance_mask;
        struct delayed_work     timeout;
+       struct completion       done;
 };
 
 struct coda_params {
@@ -727,6 +728,7 @@ static void coda_device_run(void *m2m_priv)
        /* 1 second timeout in case CODA locks up */
        schedule_delayed_work(&dev->timeout, HZ);
 
+       INIT_COMPLETION(dev->done);
        coda_command_async(ctx, CODA_COMMAND_PIC_RUN);
 }
 
@@ -971,6 +973,10 @@ static int coda_start_streaming(struct vb2_queue *q, 
unsigned int count)
        if (!(ctx->rawstreamon & ctx->compstreamon))
                return 0;
 
+       if (coda_isbusy(dev))
+               if (wait_for_completion_interruptible_timeout(&dev->done, HZ) 
<= 0)
+                       return -EBUSY;
+
        ctx->gopcounter = ctx->params.gop_size - 1;
 
        q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
@@ -1213,6 +1219,7 @@ static int coda_start_streaming(struct vb2_queue *q, 
unsigned int count)
 static int coda_stop_streaming(struct vb2_queue *q)
 {
        struct coda_ctx *ctx = vb2_get_drv_priv(q);
+       struct coda_dev *dev = ctx->dev;
 
        if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
                v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
@@ -1224,18 +1231,27 @@ static int coda_stop_streaming(struct vb2_queue *q)
                ctx->compstreamon = 0;
        }
 
-       if (!ctx->rawstreamon && !ctx->compstreamon) {
-               v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
-                        "%s: sent command 'SEQ_END' to coda\n", __func__);
-               if (coda_command_sync(ctx, CODA_COMMAND_SEQ_END)) {
-                       v4l2_err(&ctx->dev->v4l2_dev,
-                                "CODA_COMMAND_SEQ_END failed\n");
-                       return -ETIMEDOUT;
+       /* Don't stop the coda unless both queues are off */
+       if (ctx->rawstreamon || ctx->compstreamon)
+               return 0;
+
+       if (coda_isbusy(dev)) {
+               if (wait_for_completion_interruptible_timeout(&dev->done, HZ) 
<= 0) {
+                       v4l2_warn(&dev->v4l2_dev,
+                                 "%s: timeout, sending SEQ_END anyway\n", 
__func__);
                }
 
                coda_free_framebuffers(ctx);
        }
 
+       v4l2_dbg(1, coda_debug, &dev->v4l2_dev,
+                "%s: sent command 'SEQ_END' to coda\n", __func__);
+       if (coda_command_sync(ctx, CODA_COMMAND_SEQ_END)) {
+               v4l2_err(&dev->v4l2_dev,
+                        "CODA_COMMAND_SEQ_END failed\n");
+               return -ETIMEDOUT;
+       }
+
        return 0;
 }
 
@@ -1522,6 +1538,8 @@ static irqreturn_t coda_irq_handler(int irq, void *data)
                return IRQ_NONE;
        }
 
+       complete(&dev->done);
+
        src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
        dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
 
@@ -1857,6 +1875,8 @@ static int __devinit coda_probe(struct platform_device 
*pdev)
        spin_lock_init(&dev->irqlock);
        INIT_LIST_HEAD(&dev->instances);
        INIT_DELAYED_WORK(&dev->timeout, coda_timeout);
+       init_completion(&dev->done);
+       complete(&dev->done);
 
        dev->plat_dev = pdev;
        dev->clk_per = devm_clk_get(&pdev->dev, "per");
-- 
1.7.10.4

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