| Message ID | 20240416193319.778192-30-sakari.ailus@linux.intel.com |
|---|---|
| State | New |
| Headers | show |
| Series | Generic line based metadata support, internal pads | expand |
Hi Laurent, On Sat, Apr 20, 2024 at 11:31:47AM +0300, Laurent Pinchart wrote: > Hi Sakari, > > Thank you for the patch. > > On Tue, Apr 16, 2024 at 10:33:02PM +0300, Sakari Ailus wrote: > > Document which routes are available for the CCS driver (source) sub-device > > and what configuration are possible. > > > > Also update copyright. > > > > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> > > --- > > .../userspace-api/media/drivers/ccs.rst | 38 ++++++++++++++++++- > > .../media/v4l/subdev-formats.rst | 2 + > > 2 files changed, 39 insertions(+), 1 deletion(-) > > > > diff --git a/Documentation/userspace-api/media/drivers/ccs.rst b/Documentation/userspace-api/media/drivers/ccs.rst > > index 03015b33d5ab..53890ac54dab 100644 > > --- a/Documentation/userspace-api/media/drivers/ccs.rst > > +++ b/Documentation/userspace-api/media/drivers/ccs.rst > > @@ -111,4 +111,40 @@ than in the centre. > > Shading correction needs to be enabled for luminance correction level to have an > > effect. > > > > -**Copyright** |copy| 2020 Intel Corporation > > +.. _media-ccs-routes: > > + > > +Routes > > +------ > > + > > +The CCS driver implements one or two :ref:`routes <subdev-routing>` in > > +its source sub-device (scaler sub-device if exists for the device, otherwise > > s/if exists/if it exists/ Sounds good. > > > +binner) depending on whether the sensor supports embedded data. (All CCS > > +compliant sensors do but the CCS driver supports preceding standards that did > > +not require embedded data support, too.) > > + > > +The first route of the CCS source sub-device is for pixel data (sink pad > > +0/stream 0 -> source pad 1/stream 0) and the second one is for embedded data > > +(internal sink pad 2/stream 0 -> source pad 1/stream 1). > > + > > +Embedded data > > +~~~~~~~~~~~~~ > > + > > +MIPI CCS supports generation of camera sensor embedded data. The media bus code > > +used for this format on the internal sink pad is > > +:ref:`MEDIA_BUS_FMT_CCS_EMBEDDDED <MEDIA-BUS-FMT-CCS-EMBEDDED>`. > > + > > +The bit depth of the CCS pixel data affects how the sensor will output the > > +embedded data, adding padding to align with CSI-2 bus :ref:`Data Units > > +<media-glossary-data-unit>` for that particular bit depth. This is indicated by > > +the generic metadata format on the sensor's source sub-device's source pad. > > That's a bit hard to parse, maybe "on the source pad of the sensor's > source sub-device" ? Sounds good. > > > + > > +Devices supporting embedded data for bit depths greater than or equal to 16 may > > +support more dense packing or legacy single metadata byte per data unit, or both > > +of these. The supported embedded data formats can be enumerated and configured > > +on stream 1 of the source pad (1) of the CCS source sub-device. > > + > > +The use of the denser packing results in embedded data lines being longer than > > +the pixel data in data units since the data units are smaller. In bytes the > > +embedded data lines are still not longer than the image data lines. > > + > > +**Copyright** |copy| 2020, 2023 Intel Corporation > > 2024 ? Yes. > > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Thanks! > > > diff --git a/Documentation/userspace-api/media/v4l/subdev-formats.rst b/Documentation/userspace-api/media/v4l/subdev-formats.rst > > index fa181ce8f48c..a04756092238 100644 > > --- a/Documentation/userspace-api/media/v4l/subdev-formats.rst > > +++ b/Documentation/userspace-api/media/v4l/subdev-formats.rst > > @@ -8594,3 +8594,5 @@ levels above. > > This mbus code are only used for "2-byte simplified tagged data format" (code > > 0xa) but their use may be extended further in the future, to cover other CCS > > embedded data format codes. > > + > > +Also see :ref:`CCS driver documentation <media-ccs-routes>`. >
diff --git a/Documentation/userspace-api/media/drivers/ccs.rst b/Documentation/userspace-api/media/drivers/ccs.rst index 03015b33d5ab..53890ac54dab 100644 --- a/Documentation/userspace-api/media/drivers/ccs.rst +++ b/Documentation/userspace-api/media/drivers/ccs.rst @@ -111,4 +111,40 @@ than in the centre. Shading correction needs to be enabled for luminance correction level to have an effect. -**Copyright** |copy| 2020 Intel Corporation +.. _media-ccs-routes: + +Routes +------ + +The CCS driver implements one or two :ref:`routes <subdev-routing>` in +its source sub-device (scaler sub-device if exists for the device, otherwise +binner) depending on whether the sensor supports embedded data. (All CCS +compliant sensors do but the CCS driver supports preceding standards that did +not require embedded data support, too.) + +The first route of the CCS source sub-device is for pixel data (sink pad +0/stream 0 -> source pad 1/stream 0) and the second one is for embedded data +(internal sink pad 2/stream 0 -> source pad 1/stream 1). + +Embedded data +~~~~~~~~~~~~~ + +MIPI CCS supports generation of camera sensor embedded data. The media bus code +used for this format on the internal sink pad is +:ref:`MEDIA_BUS_FMT_CCS_EMBEDDDED <MEDIA-BUS-FMT-CCS-EMBEDDED>`. + +The bit depth of the CCS pixel data affects how the sensor will output the +embedded data, adding padding to align with CSI-2 bus :ref:`Data Units +<media-glossary-data-unit>` for that particular bit depth. This is indicated by +the generic metadata format on the sensor's source sub-device's source pad. + +Devices supporting embedded data for bit depths greater than or equal to 16 may +support more dense packing or legacy single metadata byte per data unit, or both +of these. The supported embedded data formats can be enumerated and configured +on stream 1 of the source pad (1) of the CCS source sub-device. + +The use of the denser packing results in embedded data lines being longer than +the pixel data in data units since the data units are smaller. In bytes the +embedded data lines are still not longer than the image data lines. + +**Copyright** |copy| 2020, 2023 Intel Corporation diff --git a/Documentation/userspace-api/media/v4l/subdev-formats.rst b/Documentation/userspace-api/media/v4l/subdev-formats.rst index fa181ce8f48c..a04756092238 100644 --- a/Documentation/userspace-api/media/v4l/subdev-formats.rst +++ b/Documentation/userspace-api/media/v4l/subdev-formats.rst @@ -8594,3 +8594,5 @@ levels above. This mbus code are only used for "2-byte simplified tagged data format" (code 0xa) but their use may be extended further in the future, to cover other CCS embedded data format codes. + +Also see :ref:`CCS driver documentation <media-ccs-routes>`.
Document which routes are available for the CCS driver (source) sub-device and what configuration are possible. Also update copyright. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> --- .../userspace-api/media/drivers/ccs.rst | 38 ++++++++++++++++++- .../media/v4l/subdev-formats.rst | 2 + 2 files changed, 39 insertions(+), 1 deletion(-)