dc: remove REF_TO_SYNC programming for nvdisp

H_REF_TO_SYNC and V_REF_TO_SYNC are legacy timing parameters
that don't apply to nvdisplay. This patch cleans up and fixes
our common mode handling logic accordingly:
1) Update tegra_dc_get_override_mode() so that it only reads
   the DC_DISP_REF_TO_SYNC register for T21x when querying the
   BL mode. This register doesn't even exist anymore on T186/T194.
2) Update the DP/HDMI mode filters so that they only enforce
   the V_FRONT_PORCH >= V_REF_TO_SYNC + 1 constraint for T21x.
3) Update tegra_dsi_wait_frame_end() so that it waits for
   V_REF_TO_SYNC additional lines only on T21x.
4) Fork off a separate mode check function for nvdisplay. This
   function contains the appropriate constraints as per the
   HW guidelines.
5) Update parse_modes() in of_dc so that it ignores the
   "nvidia,h-ref-to-sync" and "nvidia,v-ref-to-sync" properties
   on nvdisplay.
6) Completely stub out the tegra_dc_sor_disable_win_short_raster()
   and tegra_dc_sor_restore_win_and_raster() functions for nvdisplay.
   These functions are currently invoked as part of the SOR detach
   sequence, but make no sense for the most part, given the current
   T186/T194 SOR programming guidelines. The window detach and restore
   sequences are still needed, but this will be cleaned up in a
   follow-up change.

   As part of this SOR change, update the MSA source so that it's
   generated from the RG, instead of the OR. Beginning with T186,
   async FIFOs were added between the RG and OR to buffer MSA data
   coming directly from the RG via a new bus. We should be using
   this method instead.

Bug 200388676
JIRA TDS-2003

Change-Id: I115ee96c9510b477b90257c3510c11afbad51d23
Signed-off-by: Shu Zhong <shuz@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1659736
GVS: Gerrit_Virtual_Submit
Reviewed-by: Ujwal Patel <ujwalp@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

0 files changed, 0 insertions, 0 deletions