[PATCH v8 05/14] media: platform: Improve power on and power off flow

Xia Jiang
2020-04-03T09:40:53Z

Call pm_runtime_get_sync() before starting a frame and then
pm_runtime_put() after completing it. This can save power for the time
between processing two frames.

Signed-off-by: Xia Jiang <xia.jiang@mediatek.com>
---
.../media/platform/mtk-jpeg/mtk_jpeg_core.c | 27 +++++--------------
1 file changed, 6 insertions(+), 21 deletions(-)

diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
index a536fa95b3d6..dd5cadd101ef 100644
--- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
+++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
@@ -710,23 +710,6 @@ static struct vb2_v4l2_buffer *mtk_jpeg_buf_remove(struct mtk_jpeg_ctx *ctx,
return v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
}

-static int mtk_jpeg_start_streaming(struct vb2_queue *q, unsigned int count)
-{
- struct mtk_jpeg_ctx *ctx = vb2_get_drv_priv(q);
- struct vb2_v4l2_buffer *vb;
- int ret = 0;
-
- ret = pm_runtime_get_sync(ctx->jpeg->dev);
- if (ret < 0)
- goto err;
-
- return 0;
-err:
- while ((vb = mtk_jpeg_buf_remove(ctx, q->type)))
- v4l2_m2m_buf_done(vb, VB2_BUF_STATE_QUEUED);
- return ret;
-}
-
static void mtk_jpeg_stop_streaming(struct vb2_queue *q)
{
struct mtk_jpeg_ctx *ctx = vb2_get_drv_priv(q);
@@ -751,8 +734,6 @@ static void mtk_jpeg_stop_streaming(struct vb2_queue *q)

while ((vb = mtk_jpeg_buf_remove(ctx, q->type)))
v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR);
-
- pm_runtime_put_sync(ctx->jpeg->dev);
}

static const struct vb2_ops mtk_jpeg_qops = {
@@ -761,7 +742,6 @@ static const struct vb2_ops mtk_jpeg_qops = {
.buf_queue = mtk_jpeg_buf_queue,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
- .start_streaming = mtk_jpeg_start_streaming,
.stop_streaming = mtk_jpeg_stop_streaming,
};

@@ -812,7 +792,7 @@ static void mtk_jpeg_device_run(void *priv)
struct mtk_jpeg_src_buf *jpeg_src_buf;
struct mtk_jpeg_bs bs;
struct mtk_jpeg_fb fb;
- int i;
+ int i, ret;

src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
@@ -832,6 +812,10 @@ static void mtk_jpeg_device_run(void *priv)
return;
}

+ ret = pm_runtime_get_sync(jpeg->dev);
+ if (ret < 0)
+ goto dec_end;
+
mtk_jpeg_set_dec_src(ctx, &src_buf->vb2_buf, &bs);
if (mtk_jpeg_set_dec_dst(ctx, &jpeg_src_buf->dec_param, &dst_buf->vb2_buf, &fb))
goto dec_end;
@@ -957,6 +941,7 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv)
v4l2_m2m_buf_done(src_buf, buf_state);
v4l2_m2m_buf_done(dst_buf, buf_state);
v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
+ pm_runtime_put_sync(ctx->jpeg->dev);
return IRQ_HANDLED;
}

--
2.18.0