From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Longerbeam Subject: [PATCH v5 16/39] [media] v4l2: add a new-frame before end-of-frame event Date: Thu, 9 Mar 2017 20:52:56 -0800 Message-ID: <1489121599-23206-17-git-send-email-steve_longerbeam@mentor.com> References: <1489121599-23206-1-git-send-email-steve_longerbeam@mentor.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1489121599-23206-1-git-send-email-steve_longerbeam@mentor.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: "devel" To: robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org, kernel@pengutronix.de, fabio.estevam@nxp.com, linux@armlinux.org.uk, mchehab@kernel.org, hverkuil@xs4all.nl, nick@shmanahar.org, markus.heiser@darmarIT.de, p.zabel@pengutronix.de, laurent.pinchart+renesas@ideasonboard.com, bparrot@ti.com, geert@linux-m68k.org, arnd@arndb.de, sudipm.mukherjee@gmail.com, minghsiu.tsai@mediatek.com, tiffany.lin@mediatek.com, jean-christophe.trotin@st.com, horms+renesas@verge.net.au, niklas.soderlund+renesas@ragnatech.se, robert.jarzmik@free.fr, songjun.wu@microchip.com, andrew-ct.chen@mediatek.com, gregkh@linuxfoundation.org, shuah@kernel.org, sakari.ailus@linux.intel.com, pavel@ucw.cz Cc: devel@driverdev.osuosl.org, devicetree@vger.kernel.org, Steve Longerbeam , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org List-Id: devicetree@vger.kernel.org Add a NEW_FRAME_BEFORE_EOF event to signal that a video capture or output device has signaled a new frame is ready before a previous frame has completed reception or transmission. This usually indicates a DMA read/write channel is having trouble gaining bus access. Signed-off-by: Steve Longerbeam --- Documentation/media/uapi/v4l/vidioc-dqevent.rst | 6 ++++++ Documentation/media/videodev2.h.rst.exceptions | 1 + include/uapi/linux/videodev2.h | 1 + 3 files changed, 8 insertions(+) diff --git a/Documentation/media/uapi/v4l/vidioc-dqevent.rst b/Documentation/media/uapi/v4l/vidioc-dqevent.rst index dc77363..54bc7ae 100644 --- a/Documentation/media/uapi/v4l/vidioc-dqevent.rst +++ b/Documentation/media/uapi/v4l/vidioc-dqevent.rst @@ -203,6 +203,12 @@ call. has measured an interval between the reception or transmit completion of two consecutive frames of video that is outside the nominal frame interval by some tolerance value. + * - ``V4L2_EVENT_NEW_FRAME_BEFORE_EOF`` + - 8 + - This event is triggered when the video capture or output device + has signaled a new frame is ready before a previous frame has + completed reception or transmission. This usually indicates a + DMA read/write channel is having trouble gaining bus access. * - ``V4L2_EVENT_PRIVATE_START`` - 0x08000000 - Base event number for driver-private events. diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions index c7d8fad..be6f332 100644 --- a/Documentation/media/videodev2.h.rst.exceptions +++ b/Documentation/media/videodev2.h.rst.exceptions @@ -460,6 +460,7 @@ replace define V4L2_EVENT_FRAME_SYNC event-type replace define V4L2_EVENT_SOURCE_CHANGE event-type replace define V4L2_EVENT_MOTION_DET event-type replace define V4L2_EVENT_FRAME_INTERVAL_ERROR event-type +replace define V4L2_EVENT_NEW_FRAME_BEFORE_EOF event-type replace define V4L2_EVENT_PRIVATE_START event-type replace define V4L2_EVENT_CTRL_CH_VALUE ctrl-changes-flags diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index cf5a0d0..f54a82a 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -2132,6 +2132,7 @@ struct v4l2_streamparm { #define V4L2_EVENT_SOURCE_CHANGE 5 #define V4L2_EVENT_MOTION_DET 6 #define V4L2_EVENT_FRAME_INTERVAL_ERROR 7 +#define V4L2_EVENT_NEW_FRAME_BEFORE_EOF 8 #define V4L2_EVENT_PRIVATE_START 0x08000000 /* Payload for V4L2_EVENT_VSYNC */ -- 2.7.4