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author | Edmund Dea <edmund.j.dea@intel.com> | 2020-08-26 00:51:17 +0300 |
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committer | Anitha Chrisanthus <anitha.chrisanthus@intel.com> | 2021-07-29 21:28:48 +0300 |
commit | 0aab5dce395636eddf4e5f33eba88390328a95b4 (patch) | |
tree | b0e1318e48dedc8d0c37ae9c0e3547a04be8c992 /Makefile | |
parent | 8ee18e769dd621104fecad584c84ec3c4c9ef3fa (diff) | |
download | linux-0aab5dce395636eddf4e5f33eba88390328a95b4.tar.xz |
drm/kmb: Enable LCD DMA for low TVDDCV
There's an undocumented dependency between LCD layer enable bits [2-5]
and the AXI pipelined read enable bit [28] in the LCD_CONTROL register.
The proper order of operation is:
1) Clear AXI pipelined read enable bit
2) Set LCD layers
3) Set AXI pipelined read enable bit
With this update, LCD can start DMA when TVDDCV is reduced down to 700mV.
Fixes: 7f7b96a8a0a1 ("drm/kmb: Add support for KeemBay Display")
Signed-off-by: Edmund Dea <edmund.j.dea@intel.com>
Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210728003126.1425028-1-anitha.chrisanthus@intel.com
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions