In preparation to implement Tegra20 parallel video capture, add a variable
to hold the required syncpt and document all the syncpt variables.
Signed-off-by: Luca Ceresoli <luca.ceresoli@xxxxxxxxxxx>
Reviewed-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
No changes in v6
No changes in v5
Changed in v4:
- Added review tags
Changed in v3:
- recycle mw_ack_sp[0] instead of adding out_sp
No changes in v2
---
drivers/staging/media/tegra-video/vi.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/media/tegra-video/vi.h b/drivers/staging/media/tegra-video/vi.h
index dfb5870b1411..02f940f2e2eb 100644
--- a/drivers/staging/media/tegra-video/vi.h
+++ b/drivers/staging/media/tegra-video/vi.h
@@ -117,11 +117,13 @@ struct tegra_vi {
* @vi: Tegra video input device structure
* @frame_start_sp: host1x syncpoint pointer to synchronize programmed capture
* start condition with hardware frame start events through host1x
- * syncpoint counters.
+ * syncpoint counters. (Tegra210)
* @mw_ack_sp: host1x syncpoint pointer to synchronize programmed memory write
* ack trigger condition with hardware memory write done at end of
- * frame through host1x syncpoint counters.
+ * frame through host1x syncpoint counters (On Tegra20 used for the
+ * OUT_1 syncpt)
* @sp_incr_lock: protects cpu syncpoint increment.
+ * @next_out_sp_idx: next expected value for mw_ack_sp[0], i.e. OUT_1 (Tegra20)
*
* @kthread_start_capture: kthread to start capture of single frame when
* vb buffer is available. This thread programs VI CSI hardware
@@ -175,6 +177,7 @@ struct tegra_vi_channel {
struct host1x_syncpt *mw_ack_sp[GANG_PORTS_MAX];
/* protects the cpu syncpoint increment */
spinlock_t sp_incr_lock[GANG_PORTS_MAX];
+ u32 next_out_sp_idx;
struct task_struct *kthread_start_capture;
wait_queue_head_t start_wait;
--
2.34.1
