Zhi Chen <zhichen@xxxxxxxxxxxxxx> wrote: > This reverts commit 76d164f582150fd0259ec0fcbc485470bcd8033e. > PCIe hung issue was observed on multiple platforms. The issue was > reproduced > when DUT was configured as AP and associated with 50+ STAs. > > For QCA9984/QCA9888, the DMA_BURST_SIZE register controls the 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 > > With PCIe protocol analyzer, we can see DMA Read crossing 4KB boundary > when > issue happened. It broke PCIe spec and caused PCIe stuck. So revert > the default value from 0 to 1. > > Tested: IPQ8064 + QCA9984 with firmware 10.4-3.10-00047 > QCS404 + QCA9984 with firmware 10.4-3.9.0.2--00044 > Synaptics AS370 + QCA9888 with firmware 10.4-3.9.0.2--00040 > > Signed-off-by: Zhi Chen <zhichen@xxxxxxxxxxxxxx> Fails to apply: error: patch failed: drivers/net/wireless/ath/ath10k/hw.h:813 error: drivers/net/wireless/ath/ath10k/hw.h: patch does not apply stg import: Diff does not apply cleanly Patch set to Changes Requested. -- https://patchwork.kernel.org/patch/11287143/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
