| Message ID | 5b880a060574363d5ea351e20e0766abb476f6db.1723190258.git.hverkuil-cisco@xs4all.nl |
|---|---|
| State | New |
| Headers | show |
| Series | media: cec: add support for the Extron DA HD 4K Plus HDMI Splitter | expand |
Hello, On 09.08.2024 09:57, Hans Verkuil wrote: >From: Erling Ljunggren <hljunggr@cisco.com> > >Add documentation for the new edid capability. > >Signed-off-by: Erling Ljunggren <hljunggr@cisco.com> >Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Reviewed-by: Sebastian Fricke <sebastian.fricke@collabora.com> Regards, Sebastian >--- > Documentation/userspace-api/media/v4l/biblio.rst | 11 +++++++++++ > .../userspace-api/media/v4l/vidioc-querycap.rst | 11 +++++++++++ > .../userspace-api/media/videodev2.h.rst.exceptions | 1 + > 3 files changed, 23 insertions(+) > >diff --git a/Documentation/userspace-api/media/v4l/biblio.rst b/Documentation/userspace-api/media/v4l/biblio.rst >index 72aef1759b60..35674eeae20d 100644 >--- a/Documentation/userspace-api/media/v4l/biblio.rst >+++ b/Documentation/userspace-api/media/v4l/biblio.rst >@@ -334,6 +334,17 @@ VESA DMT > > :author: Video Electronics Standards Association (http://www.vesa.org) > >+.. _vesaeddc: >+ >+E-DDC >+===== >+ >+ >+:title: VESA Enhanced Display Data Channel (E-DDC) Standard >+:subtitle: Version 1.3 >+ >+:author: Video Electronics Standards Association (http://www.vesa.org) >+ > .. _vesaedid: > > EDID >diff --git a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst >index 6c57b8428356..3d11d86d9cbf 100644 >--- a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst >+++ b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst >@@ -244,6 +244,17 @@ specification the ioctl returns an ``EINVAL`` error code. > - 0x01000000 > - The device supports the :c:func:`read()` and/or > :c:func:`write()` I/O methods. >+ * - ``V4L2_CAP_EDID`` >+ - 0x02000000 >+ - The device stores the EDID for a video input, or retrieves the EDID for a video >+ output. It is a standalone EDID device, so no video streaming etc. will take place. >+ >+ For a video input this is typically an eeprom that supports the >+ :ref:`VESA Enhanced Display Data Channel Standard <vesaeddc>`. It can be something >+ else as well, for example a micro controller. >+ >+ For a video output this is typically read from an external device such as an >+ HDMI splitter accessed by a serial port. > * - ``V4L2_CAP_STREAMING`` > - 0x04000000 > - The device supports the :ref:`streaming <mmap>` I/O method. >diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions >index bdc628e8c1d6..d67fd4038d22 100644 >--- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions >+++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions >@@ -197,6 +197,7 @@ replace define V4L2_CAP_META_OUTPUT device-capabilities > replace define V4L2_CAP_DEVICE_CAPS device-capabilities > replace define V4L2_CAP_TOUCH device-capabilities > replace define V4L2_CAP_IO_MC device-capabilities >+replace define V4L2_CAP_EDID device-capabilities > > # V4L2 pix flags > replace define V4L2_PIX_FMT_PRIV_MAGIC :c:type:`v4l2_pix_format` >-- >2.43.0 > >
diff --git a/Documentation/userspace-api/media/v4l/biblio.rst b/Documentation/userspace-api/media/v4l/biblio.rst index 72aef1759b60..35674eeae20d 100644 --- a/Documentation/userspace-api/media/v4l/biblio.rst +++ b/Documentation/userspace-api/media/v4l/biblio.rst @@ -334,6 +334,17 @@ VESA DMT :author: Video Electronics Standards Association (http://www.vesa.org) +.. _vesaeddc: + +E-DDC +===== + + +:title: VESA Enhanced Display Data Channel (E-DDC) Standard +:subtitle: Version 1.3 + +:author: Video Electronics Standards Association (http://www.vesa.org) + .. _vesaedid: EDID diff --git a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst index 6c57b8428356..3d11d86d9cbf 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst @@ -244,6 +244,17 @@ specification the ioctl returns an ``EINVAL`` error code. - 0x01000000 - The device supports the :c:func:`read()` and/or :c:func:`write()` I/O methods. + * - ``V4L2_CAP_EDID`` + - 0x02000000 + - The device stores the EDID for a video input, or retrieves the EDID for a video + output. It is a standalone EDID device, so no video streaming etc. will take place. + + For a video input this is typically an eeprom that supports the + :ref:`VESA Enhanced Display Data Channel Standard <vesaeddc>`. It can be something + else as well, for example a micro controller. + + For a video output this is typically read from an external device such as an + HDMI splitter accessed by a serial port. * - ``V4L2_CAP_STREAMING`` - 0x04000000 - The device supports the :ref:`streaming <mmap>` I/O method. diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions index bdc628e8c1d6..d67fd4038d22 100644 --- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions +++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions @@ -197,6 +197,7 @@ replace define V4L2_CAP_META_OUTPUT device-capabilities replace define V4L2_CAP_DEVICE_CAPS device-capabilities replace define V4L2_CAP_TOUCH device-capabilities replace define V4L2_CAP_IO_MC device-capabilities +replace define V4L2_CAP_EDID device-capabilities # V4L2 pix flags replace define V4L2_PIX_FMT_PRIV_MAGIC :c:type:`v4l2_pix_format`