WM_CHICKEN2::Wait on Depth Stall Done Disable needs setting
- Revision r47568 (1/25/2023) of Bspec 46132 changed the format of this register from MBZ to U1.
- This bit must be set in order to perform the fast clear flushes described in Bspec 47704. Although that page mentions this bit on all platforms, only TGL/ADL actually uses depth stalls for fast clears, so I'm assuming it only applies there.