> On 24 Dec 2019, at 1:01 pm, Arend Van Spriel <arend.vanspriel@xxxxxxxxxxxx> wrote: > > Can you elaborate on the "known SDIO issue"? Is it an issue with ADMA or something else. I am asking because there is a workaround in brcmfmac to avoid scatter-gather lists, which may or may not address the issue. This describes the issue: https://patchwork.kernel.org/cover/10962975/ Below is the current workaround I’m using, which restricts the hack to Amlogic G12A and G12B devices that inherit “amlogic,dram-access-quirk” from a common SoC dtsi. https://github.com/chewitt/linux/commit/187527747861b047c835f494fe3267d9b4959be1 Testing by Khadas staff found the max_segs/max_blk_count values and shows a performance impact (not a big surprise) but they appear to give a stable connection, which is better than a very unstable one. I’ve flagged things to linux-amlogic maintainer Neil Armstrong (on CC) and I expect he or colleagues will take a more scientific look in January. NB: I’m happy to test other things. Just remember that I don’t code so you need to spoon-feed me with patches not suggestions. Christian
