wiki: Porting wiki: Porting Chat Log

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

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+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 <kieran+renesas@bingham.xyz>
+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