[PATCH v11 05/28] media: platform: Improve power on and power off flow

[Xia Jiang]

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.

Reviewed-by: Tomasz Figa <tf...@chromium.org>
Signed-off-by: Xia Jiang <xia.ji...@mediatek.com>
---
v11: no changes
---
 .../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 12609ca46fd9..fb624385969e 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(ctx->jpeg->dev);
        return IRQ_HANDLED;
 }
 
-- 
2.18.0