media: stm32-dcmi: revisit stop streaming ops

Do not wait for interrupt completion when stopping streaming,
stopping sensor and disabling interruptions are enough.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index 5d866ac..db49db7 100644 (file)
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -86,7 +86,6 @@ enum state {
        STOPPED = 0,
        WAIT_FOR_BUFFER,
        RUNNING,
-       STOPPING,
 };
 
 #define MIN_WIDTH      16U
@@ -431,18 +430,6 @@ static irqreturn_t dcmi_irq_thread(int irq, void *arg)
 
        spin_lock_irq(&dcmi->irqlock);
 
-       /* Stop capture is required */
-       if (dcmi->state == STOPPING) {
-               reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
-
-               dcmi->state = STOPPED;
-
-               complete(&dcmi->complete);
-
-               spin_unlock_irq(&dcmi->irqlock);
-               return IRQ_HANDLED;
-       }
-
        if ((dcmi->misr & IT_OVR) || (dcmi->misr & IT_ERR)) {
                dcmi->errors_count++;
                if (dcmi->misr & IT_OVR)
@@ -700,8 +687,6 @@ static void dcmi_stop_streaming(struct vb2_queue *vq)
 {
        struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
        struct dcmi_buf *buf, *node;
-       unsigned long time_ms = msecs_to_jiffies(TIMEOUT_MS);
-       long timeout;
        int ret;
 
        /* Disable stream on the sub device */
@@ -710,13 +695,6 @@ static void dcmi_stop_streaming(struct vb2_queue *vq)
                dev_err(dcmi->dev, "%s: Failed to stop streaming, subdev streamoff error (%d)\n",
                        __func__, ret);
 
-       spin_lock_irq(&dcmi->irqlock);
-       dcmi->state = STOPPING;
-       spin_unlock_irq(&dcmi->irqlock);
-
-       timeout = wait_for_completion_interruptible_timeout(&dcmi->complete,
-                                                           time_ms);
-
        spin_lock_irq(&dcmi->irqlock);
 
        /* Disable interruptions */
@@ -725,12 +703,6 @@ static void dcmi_stop_streaming(struct vb2_queue *vq)
        /* Disable DCMI */
        reg_clear(dcmi->regs, DCMI_CR, CR_ENABLE);
 
-       if (!timeout) {
-               dev_err(dcmi->dev, "%s: Timeout during stop streaming\n",
-                       __func__);
-               dcmi->state = STOPPED;
-       }
-
        /* Return all queued buffers to vb2 in ERROR state */
        list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
                list_del_init(&buf->list);
@@ -738,6 +710,7 @@ static void dcmi_stop_streaming(struct vb2_queue *vq)
        }
 
        dcmi->active = NULL;
+       dcmi->state = STOPPED;
 
        spin_unlock_irq(&dcmi->irqlock);