Message-ID: <f848b4de-abab-116f-ad68-23348f1a4b76@samsung.com>
Date:   Fri, 7 Jun 2019 12:07:55 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH 00/33] fbcon notifier begone v3!


On 6/6/19 9:38 AM, Daniel Vetter wrote:
> Hi Bart,

Hi Daniel,

> On Tue, May 28, 2019 at 11:02:31AM +0200, Daniel Vetter wrote:
>> Hi all,
>>
>> I think we're slowly getting there. Previous cover letters with more
>> context:
>>
>> https://lists.freedesktop.org/archives/dri-devel/2019-May/218362.html
>>
>> tldr; I have a multi-year plan to improve fbcon locking, because the
>> current thing is a bit a mess.
>>
>> Cover letter of this version, where I detail a bit more the details
>> fixed in this one here:
>>
>> https://lists.freedesktop.org/archives/dri-devel/2019-May/218984.html
>>
>> Note that the locking plan in this one is already outdated, I overlooked a
>> few fun issues around any printk() going back to console_lock.
>>
>> I think remaining bits:
>>
>> - Ack from Daniel Thompson for the backlight bits, he wanted to check the
>>   big picture.
> 
> I think Daniel is still on vacation until next week or so.
> 
>> - Hash out actual merge plan.
> 
> I'd like to stuff this into drm.git somehow, I guess topic branch works
> too.

I would like to have topic branch for this patchset.

> Long term I think we need to reconsider how we handle fbdev, at least the
> core/fbcon pieces. Since a few years all the work in that area has been
> motivated by drm, and pushed by drm contributors. Having that maintained
> in a separate tree that doesn't regularly integrate imo doesn't make much
> sense, and we ended up merging almost everything through some drm tree.
> That one time we didn't (for some panel rotation stuff) it resulted in
> some good suprises.
> 
> I think best solution is if we put the core and fbcon bits into drm-misc,
> as group maintained infrastructure piece. All the other gfx infra pieces
> are maintained in there already too. You'd obviously get commit rights.
> I think that would include
> - drivers/video/fbdev
> - drivers/video/*c
> - drivers/video/console

Sounds fine to me.

> I don't really care about what happens with the actual fbdev drivers
> (aside from the drm one in drm_fb_helper.c, but that's already maintained
> as part of drm). I guess we could also put those into drm-misc, or as a
> separate tree, depending what you want.
> 
> Thoughts?

I would like to handle fbdev changes for v5.3 merge window using fbdev
tree but after that everything (including changes to fbdev drivers) can go
through drm-misc tree.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> Cheers, Daniel
> 
> 
>>
>> I'm also cc'ing the entire pile to a lot more people on request.
>>
>> Thanks, Daniel
>>
>> Daniel Vetter (33):
>>   dummycon: Sprinkle locking checks
>>   fbdev: locking check for fb_set_suspend
>>   vt: might_sleep() annotation for do_blank_screen
>>   vt: More locking checks
>>   fbdev/sa1100fb: Remove dead code
>>   fbdev/cyber2000: Remove struct display
>>   fbdev/aty128fb: Remove dead code
>>   fbcon: s/struct display/struct fbcon_display/
>>   fbcon: Remove fbcon_has_exited
>>   fbcon: call fbcon_fb_(un)registered directly
>>   fbdev/sh_mobile: remove sh_mobile_lcdc_display_notify
>>   fbdev/omap: sysfs files can't disappear before the device is gone
>>   fbdev: sysfs files can't disappear before the device is gone
>>   staging/olpc: lock_fb_info can't fail
>>   fbdev/atyfb: lock_fb_info can't fail
>>   fbdev: lock_fb_info cannot fail
>>   fbcon: call fbcon_fb_bind directly
>>   fbdev: make unregister/unlink functions not fail
>>   fbdev: unify unlink_framebuffer paths
>>   fbdev/sh_mob: Remove fb notifier callback
>>   fbdev: directly call fbcon_suspended/resumed
>>   fbcon: Call fbcon_mode_deleted/new_modelist directly
>>   fbdev: Call fbcon_get_requirement directly
>>   Revert "backlight/fbcon: Add FB_EVENT_CONBLANK"
>>   fbmem: pull fbcon_fb_blanked out of fb_blank
>>   fbdev: remove FBINFO_MISC_USEREVENT around fb_blank
>>   fb: Flatten control flow in fb_set_var
>>   fbcon: replace FB_EVENT_MODE_CHANGE/_ALL with direct calls
>>   vgaswitcheroo: call fbcon_remap_all directly
>>   fbcon: Call con2fb_map functions directly
>>   fbcon: Document what I learned about fbcon locking
>>   staging/olpc_dcon: Add drm conversion to TODO
>>   backlight: simplify lcd notifier
>>
>>  arch/arm/mach-pxa/am200epd.c                  |  13 +-
>>  drivers/gpu/vga/vga_switcheroo.c              |  11 +-
>>  drivers/media/pci/ivtv/ivtvfb.c               |   6 +-
>>  drivers/staging/fbtft/fbtft-core.c            |   4 +-
>>  drivers/staging/olpc_dcon/TODO                |   7 +
>>  drivers/staging/olpc_dcon/olpc_dcon.c         |   6 +-
>>  drivers/tty/vt/vt.c                           |  18 +
>>  drivers/video/backlight/backlight.c           |   2 +-
>>  drivers/video/backlight/lcd.c                 |  12 -
>>  drivers/video/console/dummycon.c              |   6 +
>>  drivers/video/fbdev/aty/aty128fb.c            |  64 ---
>>  drivers/video/fbdev/aty/atyfb_base.c          |   3 +-
>>  drivers/video/fbdev/core/fbcmap.c             |   6 +-
>>  drivers/video/fbdev/core/fbcon.c              | 313 ++++++--------
>>  drivers/video/fbdev/core/fbcon.h              |   6 +-
>>  drivers/video/fbdev/core/fbmem.c              | 399 +++++++-----------
>>  drivers/video/fbdev/core/fbsysfs.c            |  20 +-
>>  drivers/video/fbdev/cyber2000fb.c             |   1 -
>>  drivers/video/fbdev/neofb.c                   |   9 +-
>>  .../video/fbdev/omap2/omapfb/omapfb-sysfs.c   |  21 +-
>>  drivers/video/fbdev/sa1100fb.c                |  25 --
>>  drivers/video/fbdev/savage/savagefb_driver.c  |   9 +-
>>  drivers/video/fbdev/sh_mobile_lcdcfb.c        | 132 +-----
>>  drivers/video/fbdev/sh_mobile_lcdcfb.h        |   5 -
>>  include/linux/console_struct.h                |   5 +-
>>  include/linux/fb.h                            |  45 +-
>>  include/linux/fbcon.h                         |  30 ++
>>  27 files changed, 396 insertions(+), 782 deletions(-)
>>
>> --
>> 2.20.1
>>
> 
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

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