[RESEND][PATCH] [media] atmel-isc: start dma in some scenario

[Songjun Wu]

If a new vb buf is added to vb queue, the queue is
empty and steaming, dma should be started.

Signed-off-by: Songjun Wu 
---

 drivers/media/platform/atmel/atmel-isc.c | 9 -
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isc.c 
b/drivers/media/platform/atmel/atmel-isc.c
index ccfe13b..ff403d5 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -617,7 +617,14 @@ static void isc_buffer_queue(struct vb2_buffer *vb)
unsigned long flags;
 
spin_lock_irqsave(>dma_queue_lock, flags);
-   list_add_tail(>list, >dma_queue);
+   if (!isc->cur_frm && list_empty(>dma_queue) &&
+   vb2_is_streaming(vb->vb2_queue)) {
+   isc->cur_frm = buf;
+   isc_start_dma(isc->regmap, isc->cur_frm,
+   isc->current_fmt->reg_dctrl_dview);
+   } else {
+   list_add_tail(>list, >dma_queue);
+   }
spin_unlock_irqrestore(>dma_queue_lock, flags);
 }
 
-- 
2.7.4

[RESEND][PATCH] [media] atmel-isc: start dma in some scenario

[Songjun Wu]

If a new vb buf is added to vb queue, the queue is
empty and steaming, dma should be started.

Signed-off-by: Songjun Wu 
---

 drivers/media/platform/atmel/atmel-isc.c | 9 -
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isc.c 
b/drivers/media/platform/atmel/atmel-isc.c
index ccfe13b..ff403d5 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -617,7 +617,14 @@ static void isc_buffer_queue(struct vb2_buffer *vb)
unsigned long flags;
 
spin_lock_irqsave(>dma_queue_lock, flags);
-   list_add_tail(>list, >dma_queue);
+   if (!isc->cur_frm && list_empty(>dma_queue) &&
+   vb2_is_streaming(vb->vb2_queue)) {
+   isc->cur_frm = buf;
+   isc_start_dma(isc->regmap, isc->cur_frm,
+   isc->current_fmt->reg_dctrl_dview);
+   } else {
+   list_add_tail(>list, >dma_queue);
+   }
spin_unlock_irqrestore(>dma_queue_lock, flags);
 }
 
-- 
2.7.4

[RESEND][PATCH] [media] atmel-isc: start dma in some scenario

[Songjun Wu]

If a new vb buf is added to vb queue, the queue is
empty and steaming, dma should be started.

Signed-off-by: Songjun Wu 
---

 drivers/media/platform/atmel/atmel-isc.c | 9 -
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isc.c 
b/drivers/media/platform/atmel/atmel-isc.c
index ccfe13b..ff403d5 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -617,7 +617,14 @@ static void isc_buffer_queue(struct vb2_buffer *vb)
unsigned long flags;
 
spin_lock_irqsave(>dma_queue_lock, flags);
-   list_add_tail(>list, >dma_queue);
+   if (!isc->cur_frm && list_empty(>dma_queue) &&
+   vb2_is_streaming(vb->vb2_queue)) {
+   isc->cur_frm = buf;
+   isc_start_dma(isc->regmap, isc->cur_frm,
+   isc->current_fmt->reg_dctrl_dview);
+   } else {
+   list_add_tail(>list, >dma_queue);
+   }
spin_unlock_irqrestore(>dma_queue_lock, flags);
 }
 
-- 
2.7.4

[RESEND][PATCH] [media] atmel-isc: start dma in some scenario

[Songjun Wu]

If a new vb buf is added to vb queue, the queue is
empty and steaming, dma should be started.

Signed-off-by: Songjun Wu 
---

 drivers/media/platform/atmel/atmel-isc.c | 9 -
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isc.c 
b/drivers/media/platform/atmel/atmel-isc.c
index ccfe13b..ff403d5 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -617,7 +617,14 @@ static void isc_buffer_queue(struct vb2_buffer *vb)
unsigned long flags;
 
spin_lock_irqsave(>dma_queue_lock, flags);
-   list_add_tail(>list, >dma_queue);
+   if (!isc->cur_frm && list_empty(>dma_queue) &&
+   vb2_is_streaming(vb->vb2_queue)) {
+   isc->cur_frm = buf;
+   isc_start_dma(isc->regmap, isc->cur_frm,
+   isc->current_fmt->reg_dctrl_dview);
+   } else {
+   list_add_tail(>list, >dma_queue);
+   }
spin_unlock_irqrestore(>dma_queue_lock, flags);
 }
 
-- 
2.7.4

[PATCH] [media] atmel-isc: start dma in some scenario

[Songjun Wu]

If a new vb buf is added to vb queue, the queue is
empty and steaming, dma should be started.

Signed-off-by: Songjun Wu 
---

 drivers/media/platform/atmel/atmel-isc.c | 8 +++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isc.c 
b/drivers/media/platform/atmel/atmel-isc.c
index ccfe13b..8e25d3f 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -617,7 +617,13 @@ static void isc_buffer_queue(struct vb2_buffer *vb)
unsigned long flags;
 
spin_lock_irqsave(>dma_queue_lock, flags);
-   list_add_tail(>list, >dma_queue);
+   if (!isc->cur_frm && list_empty(>dma_queue) &&
+   vb2_is_streaming(vb->vb2_queue)) {
+   isc->cur_frm = buf;
+   isc_start_dma(isc->regmap, isc->cur_frm,
+   isc->current_fmt->reg_dctrl_dview);
+   } else
+   list_add_tail(>list, >dma_queue);
spin_unlock_irqrestore(>dma_queue_lock, flags);
 }
 
-- 
2.7.4

[PATCH] [media] atmel-isc: start dma in some scenario

[Songjun Wu]

If a new vb buf is added to vb queue, the queue is
empty and steaming, dma should be started.

Signed-off-by: Songjun Wu 
---

 drivers/media/platform/atmel/atmel-isc.c | 8 +++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isc.c 
b/drivers/media/platform/atmel/atmel-isc.c
index ccfe13b..8e25d3f 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -617,7 +617,13 @@ static void isc_buffer_queue(struct vb2_buffer *vb)
unsigned long flags;
 
spin_lock_irqsave(>dma_queue_lock, flags);
-   list_add_tail(>list, >dma_queue);
+   if (!isc->cur_frm && list_empty(>dma_queue) &&
+   vb2_is_streaming(vb->vb2_queue)) {
+   isc->cur_frm = buf;
+   isc_start_dma(isc->regmap, isc->cur_frm,
+   isc->current_fmt->reg_dctrl_dview);
+   } else
+   list_add_tail(>list, >dma_queue);
spin_unlock_irqrestore(>dma_queue_lock, flags);
 }
 
-- 
2.7.4