Split the PLL setup code into computation and update functions; compute the PLL values during atomic checks, update the PLL during atomic commits; cleanup the whole thing.
The current PLL setup code for mgag200 mixes up computation if the PLL values and programming the HW. Both is done during atomic commits. As the computation phase can fail, the patch splits the functions and moves the computation to atomic-check phase. The PLL values are stores as part of the CRTC's atomic state.
As the PLL code is currently unmaintainable, apply various cleanups. For example, split functions that handle multiple HW revisions, constify values, move compute and update code to distict locations, and unify the representation of the PLL's values.
Tested on G200EH by setting modes in Weston, fbdev, and Xorg. Further testing is welcome.
Thomas Zimmermann (12): drm/mgag200: Select clock in PLL update functions drm/mgag200: Return errno codes from PLL compute functions drm/mgag200: Remove P_ARRAY_SIZE drm/mgag200: Split PLL setup into compute and update functions drm/mgag200: Introduce separate variable for PLL S parameter drm/mgag200: Store values (not bits) in struct mgag200_pll_values drm/mgag200: Split several PLL functions by device type drm/mgag200: Separate PLL compute and update functions from each other drm/mgag200: Split PLL computation for G200SE drm/mgag200: Declare PLL clock constants static const drm/mgag200: Introduce custom CRTC state drm/mgag200: Compute PLL values during atomic check
drivers/gpu/drm/drm_simple_kms_helper.c | 39 +- drivers/gpu/drm/mgag200/mgag200_drv.h | 28 + drivers/gpu/drm/mgag200/mgag200_mode.c | 965 +++++++++++++++--------- include/drm/drm_simple_kms_helper.h | 27 + 4 files changed, 720 insertions(+), 339 deletions(-)
-- 2.32.0