Op 09-12-16 om 09:25 schreef Daniel Vetter:
> On Fri, Dec 09, 2016 at 12:42:19AM +0200, Laurent Pinchart wrote:
>> Hi Daniel,
>>
>> On Thursday 08 Dec 2016 16:41:04 Daniel Vetter wrote:
>>> On Thu, Dec 08, 2016 at 02:45:25PM +0100, Maarten Lankhorst wrote:
>>>> Atomic drivers may set properties like rotation on the same fb, which
>>>> may require a call to prepare_fb even when framebuffer stays identical.
>>>>
>>>> Instead of handling all the special cases in the core, let the driver
>>>> decide when prepare_fb and cleanup_fb are noops.
>>>>
>>>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
>>> I think this makes sense, but would be really good to get a pile of acks
>>> from driver maintainers on this one. Rob, Eric, Laurent, others?
>> This is all very nice, but it will introduce at least a performance
>> regression, and possibly worse, until drivers get updated. There are 7 drivers
>> implementing the .prepare_fb() callback (plus a bunch of drivers that probably
>> should use drm_fb_cma_prepare_fb() but don't at the moment). I can't ack this
>> patch before they get fixed.
> Maarten's commit message is insufficient, since this is defacto a revert
> of
>
> commit fcc60b413d14dd06ddbd79ec50e83c4fb2a097ba
> Author: Keith Packard <keithp@xxxxxxxxxx>
> Date: Sat Jun 4 01:16:22 2016 -0700
>
> drm: Don't prepare or cleanup unchanging frame buffers [v3]
>
> because that breaks stuff. We're simply going back to where we've been a
> few months ago. Since this is a regression fix, back to original
> behaviour, can you ack (assuming Maarten updates the commit message to
> reflect the nature of the commit here)?
Waiting on a reply, but what about this commit message for this patch?
---
Atomic drivers may set properties like rotation on the same fb, which
may require a call to prepare_fb even when framebuffer stays identical.
Instead of handling all the special cases in the core, let the driver
decide when prepare_fb and cleanup_fb are noops.
This is a revert of:
commit fcc60b413d14dd06ddbd79ec50e83c4fb2a097ba
Author: Keith Packard <keithp@xxxxxxxxxx>
Date: Sat Jun 4 01:16:22 2016 -0700
drm: Don't prepare or cleanup unchanging frame buffers [v3]
The original commit mentions that this prevents waiting in i915 on all
previous rendering during cursor updates, but there are better ways to
fix this.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
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