This patchset converts mgag200 to atomic modesetting. It uses simple KMS helpers and SHMEM. I'm posting v3 mostly for reference. These patches will land soon if no one objects.
Patch 1 removes cursor support. The HW cursor is not usable with the way universal planes work.
Patches 2 to 11 untangle the existing modesetting code into smaller functions. Specifically, mode setting and plane updates are being separated from each other.
Patch 12 to 14 convert mgag200 to simple KMS helpers and enables atomic mode setting.
Atomically switching plane framebuffers, requires either source or target buffer to be located at a non-0 offet. As some HW revisions seem to require a framebuffer offset of 0 within the video memory, they do not work with atomic modesetting. To resolve this problem, patch 15 converts mgag200 from VRAM helpers to SHMEM helpers. During plane updates, the content of the SHMEM BO is memcpy'd to VRAM. From my observation, performance is not nuch different from the original code.
The patchset has been tested on MGA G200EH hardware.
v3: * update commit messages * remove unused defines v2: * rebase patchset * replace uint{8,32}_t with u{8,32} through-out patchset * define additional register constants * use helper functions around bpp-shift computations * split conversion patch * keep busy-waiting in DPMS code * cleanups
Thomas Zimmermann (15): drm/mgag200: Remove HW cursor 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 out-commented suspend/resume helpers drm/mgag200: Use simple-display data structures 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_drv.c | 51 +- drivers/gpu/drm/mgag200/mgag200_drv.h | 45 +- drivers/gpu/drm/mgag200/mgag200_main.c | 5 - drivers/gpu/drm/mgag200/mgag200_mode.c | 871 ++++++++++++++----------- drivers/gpu/drm/mgag200/mgag200_reg.h | 11 +- drivers/gpu/drm/mgag200/mgag200_ttm.c | 28 +- 8 files changed, 528 insertions(+), 489 deletions(-)
-- 2.26.2