mirror of
https://git.proxmox.com/git/mirror_ubuntu-kernels.git
synced 2026-01-26 04:32:41 +00:00
facd619b88
On ILK disabling LP1+ watermarks must be done carefully to avoid underruns. If we just write 0 to the register in the middle of the scan cycle we often get an underrun. So instead we have to leave the actual watermark levels in the register intact, and just toggle the enable bit. Presumably the hardware takes a while to get out of low power mode, and so the watermark level need to stay valid until that time. We also have to be careful with the WM1S_LP_EN bit. It seems the hardware more or less treats it like the actual watermarks numbers, and so we must not toggle it too soon. Just leave it alone when disabling the LP1+ watermarks. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Imre Deak <imre.deak@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> |
||
|---|---|---|
| .. | ||
| drm | ||
| host1x | ||
| vga | ||
| Makefile | ||