kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-10 20:48:12 +00:00
Code Issues Releases Packages Activity

dmaengine: dw-edma: Add core quiesce operations

Browse source 
Add core operations that quiesce only the resources represented by a
dw-edma instance, separate from the existing full controller off path.

For unrolled eDMA, quiesce masks the direction, disables ENGINE_EN,
waits for it to read back clear, then clears pending interrupt status.
If ENGINE_EN does not clear, return the timeout to the caller.
HDMA compatibility mode does not implement ENGINE_EN, so quiesce clears
CHi_PWR_EN for each represented channel instead. Both register maps
share interrupt control per direction, so quiescing one channel
quiesces the whole direction. Callers must own that direction and stop
the peer from programming it first.

HDMA native has per-channel registers and can quiesce the represented
channel directly.

No caller is added yet, so this is a no-functional-change preparation
for delegated channel reclaim and partial-owned remove paths.

Signed-off-by: Koichiro Den <den@valinux.co.jp>
Link: https://patch.msgid.link/20260721062815.4117887-4-den@valinux.co.jp
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Koichiro Den 2026-07-21 15:28:04 +09:00 • committed by Vinod Koul
commit c9c25b2f32
3 changed files with 158 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files