From 55e3b2f45880faaf06f3c660ca9e8a6d9aa14bce Mon Sep 17 00:00:00 2001 From: Kuninori Morimoto Date: Mon, 9 Dec 2019 15:29:52 +0900 Subject: wiki: Porting wiki: Porting Chat Log Signed-off-by: Kuninori Morimoto --- wiki/Chat_log/20161009-mm-chatlog | 300 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 300 insertions(+) create mode 100644 wiki/Chat_log/20161009-mm-chatlog (limited to 'wiki/Chat_log/20161009-mm-chatlog') diff --git a/wiki/Chat_log/20161009-mm-chatlog b/wiki/Chat_log/20161009-mm-chatlog new file mode 100644 index 0000000..b1d66c5 --- /dev/null +++ b/wiki/Chat_log/20161009-mm-chatlog @@ -0,0 +1,300 @@ +h1. Multimedia-chat-meeting-2016-10-09 + +Hello, + +We had a multimedia group meeting on 2016-10-09. Here's a summary of the discussions. Please correct any mistake you would notice. + +Attendees: + +- Kieran +- Laurent +- Morimoto-san +- Niklas +- Ulrich + +Magnus was excused due to being in a plane. + + +Topic 1. Status check for the multimedia tasks +---------------------------------------------- + +* Kieran + +Since last meeting: + +- Attended Kernel Recipes in Paris + +There were a few multimedia presentations given, in particular about colourspace and DRM. + +- Display writeback implementation + +This is targeted at Gen3, based on VSP1 writeback. Need a few changes to the VSP driver in the frame end processing to handle writeback and display update races. + +For the next two weeks: + +- ELC-E +- Display writeback + +Issues and Blockers: + +- WPF Lockup I was experiencing is likely invalid until I get timings fixed up for a better test. +- Changes to VSP1 timings atomic_flush() must be verified. + + +* Laurent + +Since last meeting: + +- Attended Kernel Recipes in Paris + +- LVDS mode selection for the DU driver + +Patches have been posted, the DT bindings have just been reviewed today. A new +version will be needed. + +- DU support for M3-W + +Code tested, works with VGA output. Will post patches after ELC-E. + +- DU encoders clean up + +Use the drm_bridge framework to handle all external encoders, including the +VGA DAC with the driver recently submitted by Maxime Ripard. This allows +deleting the hardcoded list of encoders from the DU driver. + +For the next two weeks: + +- ELC-E +- New version of the LVDS mode selection patches +- Post M3-W DU support patches +- Continue with the DU encoders clean up +- Post proposal for rotation & histogram API + +Issues and Blockers: + +None. + + +* Niklas + +Since last meeting: + +- VSP1 HGT tests + +Extended the tests to cover overlapping hue areas. Patches posted, will be +merged by Laurent in a separate branch until the corresponding kernel code +lands upstream. + +- VIN Gen3 rework + +Make use of the media controller framework instead of V4L2 input selection. + +For the next two weeks: + +- ELC-E +- VIN support for M3-W proof of concept +- Continue working on media controller-based input selection in VIN +- Discuss ADV7482 upstreaming face to face with Hans + +Issues and Blockers: + +None. + + +* Morimoto-san + +Since last meeting: + +- Handled BSP team multimedia requests +- LinuxCon Europe +- Bunch of audio patches accepted + +The other pending patches will be posted after the merge window closes. + +For the next two weeks: + +- ELC-E +- Meeting with ALSA SoC maintainer at ELC-E + +Need to discuss framework historical issues that require cleanup. Due to +timezone differences progress on that was slow on the mailing list, hope to +move forward face-to-face. + +Issues include + + - old architecture, needs cleanup + - unbind problem (races, crashes) + +Issues and Blockers: + +None. + +* Ulrich + +Since last meeting: + +- Reposted Gen2 VIN integration + +Updates to the ADV7180 DT bindings are needed to add ports, this won't be +trivial. + +For the next two weeks: + +- ELC-E +- Face to face discussions about the ADV7180 DT bindings with Hans Verkuil + +Issues and Blockers: + +Non-trivial changes to the ADV7180 DT bindings. + + +Topic 2. BSP patch mining coordination +-------------------------------------- + +Team leaders have been tasked with mining the BSP for patches and classifying +them based on the subsystem/device/feature they're related to, with a proposed +upstreaming plan for each of them. Morimoto-san has already posted a list to +the Renesas wiki, and Simon got his own list too. + +To avoid work duplication, we will use Simon's spreadsheet as the canonical +list of BSP patches, and update the status as patches are merged in mainline. + + +Topic 3. BSP team requests +-------------------------- + +- Cache management on V4L2 + +The problem is well known but no mainline solution has been developed yet. +There is however interest in this topic from various companies. + +This can be handled as additional task(s), the schedule needs to be discussed. + +- Rotation and image partitioning + +Image partitioning has been implemented and merged in mainline for v4.9. +Rotation support has been implemented as well but currently blocked on review. +The upstream target is v4.10 at this point. + +- V4L2 Request API + +The API will be discussed tomorrow during a whole day V4L2 meeting with Hans +Verkuil and Sakari Ailus among others. More information about the upstreaming +schedule will be available then. + +- VSP1 state bug + +Two race conditions have been found recently. One of them has already been +fixed in mainline (v4.9): + +commit bfb4d5be9e1d5a70d0710e815d15a4245eaaafc4 +Author: Kieran Bingham +Date: Tue Sep 6 14:07:09 2016 -0300 + + [media] v4l: vsp1: Repair race between frame end and qbuf handle + +Work is in progress on a second one. Whether the issue found by the BSP team +is identical isn't known yet. It would be helpful if the BSP could retest with +the above commit. We can schedule an additional task for this quarter to solve +the problem if it still occurs. + +- DU/VIN DT style difference between ES1.x and ES2.0 + +The DU and attached VSPs have changed significantly between ES1.x and ES2.0. +This will require different compatible strings. The "renesas,vsps" property +will still be used, referencing 3 VSPs instead of 4. There should be no other +change needed to the DU DT bindings. + +For VIN, differences between ES versions are limited to CSI2 routing. This is +hardcoded in the driver at the moment. As VIN has no IP core version register, +routing selection has to be done through different compatible strings at the +minimum. Another option would be to express full routing in DT, but that would +be more complex and isn't considered as a good solution. + +- Is it possible to have VIN on renesas-drivers in 11/M ? (M3/H3) + +VIN on Gen3 requires the external HDMI to CSI2 ADV7482 driver. At the moment +the existing driver is a prototype that hardcodes input selection due to +missing V4L2 APIs upstream (this topic will be discussed face to face with +Hans Verkuil this week). Whether the code can be merged in renesas-drivers +depends if the renesas-drivers tree is a Renesas -next staging area or a BSP +staging area. We expect the core group to discuss this topic and provide an +answer. + +- Is it possible to have M3 DU on renesas-drivers in 11/M ? + +Yes. + +- rcar-du + dma-buf + fence + +The DU driver supports buffer sharing with dma-buf, but doesn't implement +fence support. Support for the upstream API can be implemented, but can't be +tested at this time with the GPU due to the GPU driver not being publicly +available. We can thus schedule fence support as an additional task, but +without any guarantee that it will work out of the box with the SGX driver +stack. + +- horizontal lines appears in the plane + +The BSP team noticed a display corruption issue with renesas- +drivers-2016-09-20-v4.8-rc7 with the following patches applied: + + - gen3_du_ipmmu.config + - 0001-linux-v4.8-rc-fcp-get-device-20160901.patch + - 0002-arm64-dtsi-r8a7795-Enable-IPMMU-node-for-DU0-1-2-3.patch + - 0003-v4l-vsp1-Add-underrun-hung-up-workaround.patch + +If we can get those four patches we will investigate and provide a fix or, if +the problem is complex, a plan. + +- Runtime SRC (Sampling Rate Converter) connection on R-Car sound + +The customer would like to use the SRC several times in the audio pipeline. +This can't easily be handled with the current driver design. The exact use +case behind the request isn't known, Morimoto-san asked for details. If the +use case is valid, implementation would require major changes to the driver. + + +Topic 4. Additional tasks for 12/M +---------------------------------- + +We drafted the following list of candidates for additional tasks. + +* Can be addressed immediately + +- GStreamer V4L2 deinterlacer element +- VSP test suite improvements +- VSP image partitioning quality optimization +- Cache management in V4L2 +- Fix VSP1 race conditions +- R-Car DU fence support +- Fix Display corruption (horizontal lines) with IPMMU +- Suspend/resume test suite +- Gen3 HDMI output upstreaming + +* Needs coordination with Renesas + +- VSP suspend/resume support prototype +- Wayland V4L2 compositor performance assessment +- FCP near-lossless compression (FCNL) prototype + +* Blocked by hardware availability + +- VSP ES2.0 BRS support prototype +- H3 ES2.0 DU support prototype + +* Not wanted by Renesas at the moment + +- Video codecs support + + +Topic 5. Next meeting +--------------------- + +The next meeting will be held on Tuesday 2016-10-25 at 08:00 BST / 09:00 CEST +/ 10:00 EEST / 14:00 JST. + +-- +Regards, + +Laurent Pinchart -- cgit v1.2.3