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> > Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx> Patch applied to ath-next branch of ath.git, thanks. a1769bb68a85 Revert "ath10k: fix DMA related firmware crashes on multiple devices" -- https://patchwork.kernel.org/patch/11331293/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
