linux-kernel - [PATCH v2 1/2] media: cedrus: Program output format during each run

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Date:   Tue, 21 Apr 2020 23:04:09 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Maxime Ripard <mripard@...nel.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-sunxi@...glegroups.com,
        Samuel Holland <samuel@...lland.org>,
        Jernej Škrabec <jernej.skrabec@...il.com>
Subject: [PATCH v2 1/2] media: cedrus: Program output format during each run

Previously, the output format was programmed as part of the ioctl()
handler. However, this has two problems:

  1) If there are multiple active streams with different output
     formats, the hardware will use whichever format was set last
     for both streams. Similary, an ioctl() done in an inactive
     context will wrongly affect other active contexts.
  2) The registers are written while the device is not actively
     streaming. To enable runtime PM tied to the streaming state,
     all hardware access needs to be moved inside cedrus_device_run().

The call to cedrus_dst_format_set() is now placed just before the
codec-specific callback that programs the hardware.

Fixes: 50e761516f2b ("media: platform: Add Cedrus VPU decoder driver")
Suggested-by: Jernej Škrabec <jernej.skrabec@...il.com>
Suggested-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Signed-off-by: Samuel Holland <samuel@...lland.org>
---

v2: added patch

---
 drivers/staging/media/sunxi/cedrus/cedrus_dec.c   | 2 ++
 drivers/staging/media/sunxi/cedrus/cedrus_video.c | 3 ---
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
index 4a2fc33a1d79..58c48e4fdfe9 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
@@ -74,6 +74,8 @@ void cedrus_device_run(void *priv)
 
 	v4l2_m2m_buf_copy_metadata(run.src, run.dst, true);
 
+	cedrus_dst_format_set(dev, &ctx->dst_fmt);
+
 	dev->dec_ops[ctx->current_codec]->setup(ctx, &run);
 
 	/* Complete request(s) controls if needed. */
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
index 15cf1f10221b..ed3f511f066f 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
@@ -273,7 +273,6 @@ static int cedrus_s_fmt_vid_cap(struct file *file, void *priv,
 				struct v4l2_format *f)
 {
 	struct cedrus_ctx *ctx = cedrus_file2ctx(file);
-	struct cedrus_dev *dev = ctx->dev;
 	struct vb2_queue *vq;
 	int ret;
 
@@ -287,8 +286,6 @@ static int cedrus_s_fmt_vid_cap(struct file *file, void *priv,
 
 	ctx->dst_fmt = f->fmt.pix;
 
-	cedrus_dst_format_set(dev, &ctx->dst_fmt);
-
 	return 0;
 }
 
-- 
2.24.1