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| author | Sugar Zhang <sugar.zhang@rock-chips.com> | 2020-06-04 09:36:38 +0800 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-06-24 13:11:26 +0530 |
| commit | d12ea5591eddf625b7707c018b72e46e8674c3c2 (patch) | |
| tree | e1b9c89db9de6b759e6d305fa5f23d2ce053dc38 /init | |
| parent | 0705107fcc80711680b169abc2011686dded6c21 (diff) | |
| download | linux-d12ea5591eddf625b7707c018b72e46e8674c3c2.tar.bz2 | |
dmaengine: pl330: Make sure the debug is idle before doing DMAGO
According to the datasheet of pl330:
Example 2-1 Using DMAGO with the debug instruction registers
1. Create a program for the DMA channel
2. Store the program in a region of system memory
3. Poll the DBGSTATUS Register to ensure that the debug is idle
4. Write to the DBGINST0 Register
5. Write to the DBGINST1 Register
6. Write zero to the DBGCMD Register
so, we should make sure the debug is idle before step 4/5/6, not
only step 6. if not, there maybe a risk that fail to write DBGINST0/1.
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Link: https://lore.kernel.org/r/1591234598-78919-1-git-send-email-sugar.zhang@rock-chips.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions