On 11/3/19 7:36 AM, Tom Psyborg wrote:
On 30/10/2019, zhichen@xxxxxxxxxxxxxx <zhichen@xxxxxxxxxxxxxx> wrote:
On 2019-10-23 01:16, Peter Oh wrote:
How can you say value 0 (I believe it's 64 bytes) DMA burst size
causes the symptom and 1 fixes it?
Peter
Confirmed from HW team that the configuration controls AXI burst size of
the RD/WR access to the HOST MEM.
0- No split , RAW read/write transfer size from MAC is put out on bus as
burst length.
1- Split at 256 byte boundary
2,3- Reserved
That's why we see issue with value 0.
Zhi
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is this true for both wave1 and wave2 ? at least per this commit
message: ath10k: Fix DMA burst size
it's suppose to be:
0 - 128B max (not sure if this means 128B static, or any size between 0 and 128)
1 - 256B
I didn't check other chipsets, but QCA4019 registers say AXI read/write
burst size is 64 bytes for 0.
