[PATCH 00/17] drm/mgag200: Convert to atomic modesetting

[John Donnelly]

On 4/29/20 9:32 AM, Thomas Zimmermann wrote:
> This patchset converts mgag200 to atomic modesetting. It uses simple
> KMS helpers and SHMEM.
> 
> Patches 1 to 4 simplifies the driver before the conversion. For example,
> the HW cursor is not usable with the way universal planes work. A few
> data structures can be cleaned up.
> 
> Patches 5 to 15 untangle the existing modesetting code into smaller
> functions. Specifically, mode setting and plane updates are being
> separated from each other.
> 
> Patch 16 converts mgag200 to simple KMS helpers and enables atomic
> mode setting.
> 
> As some HW seems to require a framebuffer offset of 0 within the video
> memory, it does not work with atomic modesetting. Atomically switching
> plane framebuffers, requires either source or target buffer to be located
> at a non-0 offet. To resolve this problem, patch 17 converts mgag200 from
> VRAM helpers to SHMEM helpers. During plane updates, the content of the
> SHMEM BO is memcpy'd to VRAM. From my subjective obersation, performance
> is not nuch different from the original code.
> 
> The patchset has been tested on MGA G200EH hardware.
> 
> Thomas Zimmermann (17):
>    drm/mgag200: Remove HW cursor
>    drm/mgag200: Remove unused fields from struct mga_device
>    drm/mgag200: Embed connector instance in struct mga_device
>    drm/mgag200: Use managed mode-config initialization
>    drm/mgag200: Clean up mga_set_start_address()
>    drm/mgag200: Clean up mga_crtc_do_set_base()
>    drm/mgag200: Move mode-setting code into separate helper function
>    drm/mgag200: Split MISC register update into PLL selection, SYNC and
>      I/O
>    drm/mgag200: Update mode registers after plane registers
>    drm/mgag200: Set pitch in a separate helper function
>    drm/mgag200: Set primary plane's format in separate helper function
>    drm/mgag200: Move TAGFIFO reset into separate function
>    drm/mgag200: Move hiprilvl setting into separate functions
>    drm/mgag200: Move register initialization into separate function
>    drm/mgag200: Remove waiting from DPMS code
>    drm/mgag200: Convert to simple KMS helper
>    drm/mgag200: Replace VRAM helpers with SHMEM helpers
> 
>   drivers/gpu/drm/mgag200/Kconfig          |   4 +-
>   drivers/gpu/drm/mgag200/Makefile         |   2 +-
>   drivers/gpu/drm/mgag200/mgag200_cursor.c | 319 --------
>   drivers/gpu/drm/mgag200/mgag200_drv.c    |  51 +-
>   drivers/gpu/drm/mgag200/mgag200_drv.h    |  43 +-
>   drivers/gpu/drm/mgag200/mgag200_main.c   |  28 -
>   drivers/gpu/drm/mgag200/mgag200_mode.c   | 948 ++++++++++++-----------
>   drivers/gpu/drm/mgag200/mgag200_reg.h    |   5 +-
>   drivers/gpu/drm/mgag200/mgag200_ttm.c    |  35 +-
>   9 files changed, 563 insertions(+), 872 deletions(-)
>   delete mode 100644 drivers/gpu/drm/mgag200/mgag200_cursor.c
> 
> --
> 2.26.0
> 


  Hi Thomas ,

  I would like to test this on hardware that uses this device integrated 
into as BMC  ( iLo ) that I have ran into problems before. Can you post 
your staging URL so I can clone it ?


( Thank you for CC'ing me. I removed my email from on dlist recently) .




-- 
Thank You,
John