v4l: vsp1: vsp1 writeback prototype
This short series extends the VSP1 on the RCar platforms to allow creating a
V4L2 video node on display pipelines where the hardware allows writing to
memory simultaneously.
In this instance, the hardware restricts the output to match the display size
(no rescaling) but does allow pixel format conversion.
A current limitation (that the DRI devs might have ideas about) is that the vb2
buffers are swapped on the atomic_flush() calls rather than on vsync events.
Ideally swapping buffers would occur on every vsync such that the output rate
of the video node would match the display rate, however the timing here proves
more difficult to synchronise the updates from a vsync and flush without adding
latency to the flush.
Is there anything I can do to synchronise the v4l2 buffers with the DRM/KMS
interfaces currently? Or does anyone have any suggestions for extending as
such?
And of course ideas on anything that could be done generically to support other
targets as well would be worth considering - though currently this
implementation is very RCar/VSP1 specific.
v3:
- Rebased to v4.12-rc1
v2:
- Fix checkpatch.pl warnings
- Adapt to use a single source pad for the Writeback and LIF
- Use WPF properties to determine when to create links instead of VSP
- Remove incorrect vsp1_video_verify_format() changes
- Spelling and grammar fixes
v4l: vsp1: Provide a writeback video device
When the VSP1 is used in an active display pipeline, the output of the
WPF can supply the LIF entity directly and simultaneously write to
memory.
Support this functionality in the VSP1 driver, by extending the WPF
source pads, and establishing a V4L2 video device node connected to the
new source.
The source will be able to perform pixel format conversion, but not
rescaling, and as such the output from the memory node will always be
of the same dimensions as the display output.
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
Changes since RFC
- Fix checkpatch.pl warnings
- Adapt to use a single source pad for the Writeback and LIF
- Use WPF properties to determine when to create links instead of VSP
- Remove incorrect vsp1_video_verify_format() changes
- Spelling and grammar fixes
- Rebased to v4.12-rc1
7 files changed
