Hello Nitin, On Tue, Nov 15, 2022 at 3:26 PM Nitin Gupta <nitin.gupta981@xxxxxxxxx> wrote: > > Dear All > > I am new and Facing throughput issue for RTL8822CS chipset > Same kind of issue observed in mail which is addressed by Martin . Nitin is referring to my comment from [0] where I wrote: > [...] it's not fast yet, in my tests I got ~6Mbit/s in either direction. There is no major news on this issue. My first goal is to make it work upstream, then we can improve performance. > Please let me know if that patch is good to go for Improving performance > also I came across below error which frequently coming any idea or hint which direction i need to check > > Error :- > 3.734608] RTW: ERROR sdio_io: bSurpriseRemoved, skip write 0x00041, 1 bytes > [ 33.734609] RTW: ERROR _halmac_sdio_cmd52_write: I/O FAIL! Nitin, I think the RTL8822CS driver which you are testing was written by (or for) Realtek. It's an out of tree (meaning: maintained/developed separately from the Linux kernel). All of my efforts are for the "upstream" rtw88 driver (meaning: it's part of the Linux kernel directly). That driver is also written by Realtek employees but it's a completely different codebase. Personally I don't know much about this out of tree driver - I'm only using it to understand the hardware/firmware interface that the driver communicates with. If "surprise removed" kicks in you may have some SDIO communication issues. Have you tried lowering the SDIO bus frequency (on systems with device-tree: max-frequency property of the SDIO controller)? Another reason could be some incorrectly set up CD (card detect) line. Since you haven't mentioned what board and card this is it's impossible to say for sure. Best regards, Martin [0] https://lore.kernel.org/netdev/20211228211501.468981-1-martin.blumenstingl@xxxxxxxxxxxxxx/
