brcm2708: organize kernel patches

[openwrt/staging/dedeckeh.git] / target / linux / brcm2708 / patches-4.19 / 950-0679-staging-bcm2835-codec-implement-V4L2_CID_MIN_BUFFERS.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0679-staging-bcm2835-codec-implement-V4L2_CID_MIN_BUFFERS.patch b/target/linux/brcm2708/patches-4.19/950-0679-staging-bcm2835-codec-implement-V4L2_CID_MIN_BUFFERS.patch
new file mode 100644 (file)
index 0000000..cd19bc2
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0679-staging-bcm2835-codec-implement-V4L2_CID_MIN_BUFFERS.patch
@@ -0,0 +1,46 @@
+From 1f524b04b040978e2d96380ff40c3e80feba49a5 Mon Sep 17 00:00:00 2001
+From: Chen-Yu Tsai <wens@csie.org>
+Date: Mon, 22 Jul 2019 22:13:30 +0800
+Subject: [PATCH] staging: bcm2835-codec: implement
+ V4L2_CID_MIN_BUFFERS_FOR_CAPTURE
+
+The stateful decoder specification shows an optional step for retrieving
+the miminum number of capture buffers required for the decoder to
+proceed. While not a required parameter, having it makes some
+applications happy.
+
+bcm2835-codec is a little different from other decoder implementations
+in that there is an intermediate format conversion between the hardware
+and V4L2 buffers. The number of capture buffers required is therefore
+independent of the stream and DPB etc.
+
+There are plans to remove the conversion, but it requires a fair amount
+of rework within the firmware. Until that is done, simply return a value
+of 1.
+
+Signed-off-by: Chen-Yu Tsai <wens@csie.org>
+---
+ .../vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c | 12 ++++++++++++
+ 1 file changed, 12 insertions(+)
+
+--- a/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
++++ b/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
+@@ -2357,6 +2357,18 @@ static int bcm2835_codec_open(struct fil
+               }
+               ctx->fh.ctrl_handler = hdl;
+               v4l2_ctrl_handler_setup(hdl);
++      } else if (dev->role == DECODE) {
++              v4l2_ctrl_handler_init(hdl, 1);
++
++              v4l2_ctrl_new_std(hdl, &bcm2835_codec_ctrl_ops,
++                                V4L2_CID_MIN_BUFFERS_FOR_CAPTURE,
++                                1, 1, 1, 1);
++              if (hdl->error) {
++                      rc = hdl->error;
++                      goto free_ctrl_handler;
++              }
++              ctx->fh.ctrl_handler = hdl;
++              v4l2_ctrl_handler_setup(hdl);
+       }
+ 
+       ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);