Hi Suraj
On 3/4/2022 6:16 AM, Kandpal, Suraj wrote:
Hi,
Hi,
Hi Abhinav,
Hi Laurent
Ok sure, I can take this up but I need to understand the proposal a little bit more before proceeding on this. So we will discuss this in another email where we specifically talk about the
connector changes.
Also, I am willing to take this up once the encoder part is done and merged so that atleast we keep moving on that as MSM WB implementation can proceed with that first.
Hi Jani and Suraj
Any concerns with splitting up the series into encoder and connector OR re- arranging them?
Let me know if you can do this OR I can also split this up keeping Suraj's name in the Co-developed by tag.
I was actually thinking of floating a new patch series with both encoder and connector pointer changes but with a change in initialization functions wherein we allocate a connector and encoder incase the driver doesn’t have its own this should minimize the effect on other drivers already using current drm writeback framework and also
allow i915 to create its own connector.
I was proposing to split up the encoder and connector because the comments from Laurent meant we were in agreement about the encoder but not about the connector.
I am afraid another attempt with the similar idea is only going to stall the series again and hence i gave this option.
Eventually its upto Laurent and the other maintainers to guide us forward on this as this series has been stalled for weeks now.
I thought that Laurent was quite strict about the connector. So I'd suggest targeting drm_writeback_connector with an optionally created encoder and the builtin connector
In that case even if we target that i915 will not be able to move forward with its implementation of writeback as builtin connector does not work for us right now as explained earlier, optionally creating encoder and connector will help everyone move forward and once done
we
can actually sit and work on how to side step this issue using Laurent's suggestion
This is up to Laurent & other DRM maintainers to decide whether this approach would be accepted or not. So far unfortunately I have mostly seen the pushback and a strong suggestion to stop treating each drm_connector as i915_connector. I haven't checked the exact details, but IMO adding a branch if the connector's type is DRM_CONNECTOR_VIRTUAL should be doable.
Bringing in the change where we don’t treat each drm_connector as an intel_connector or even adding a branch which checks if drm_connector is DRM_CONNECTOR_VIRTUAL and conditionally cast it to intel_connector is quite a lot of work for i915. That's why I was suggesting if for now we could move forward with optionally creating both encoder and connector minimizing affects on other drivers as well as allowing us to move forward. What do you think, Launrent?
We can work on Laurent's suggestion but that would first require the initial RFC patches and then a rework from both of our drivers side to see if they gel well with our current code which will take a considerable amount of time. We can for now however float the patch series up which minimally affects the current drivers and also allows i915 and msm to move forward with its writeback implementation off course with a proper documentation stating new drivers shouldn't try to
make their own connectors and encoders and that drm_writeback will do that for them.
Once that's done and merged we can work with Laurent on his proposal to improve the drm writeback framework so that this issue can be side
stepped entirely in future.
For now I would like to keep the encoder and connector pointer changes
together.
-- With best wishes Dmitry
Best Regards, Suraj Kandpal