This series attempts to deal better with the expected transmission errors related to the idle states (handled by the Always-On-Subsystem or AOS) on the SDIO-based WiFi on rk3288-veyron-minnie, rk3288-veyron-speedy, and rk3288-veyron-mickey. Some details about those errors can be found in <https://crbug.com/960222>, but to summarize it here: if we try to send the wakeup command to the WiFi card at the same time it has decided to wake up itself then it will behave badly on the SDIO bus. This can cause timeouts or CRC errors. When I tested on 4.19 and 4.20 these CRC errors can be seen to cause re-tuning. Since I am currently developing on 4.19 this was the original problem I attempted to solve. On mainline it turns out that you don't see the retuning errors but you see tons of spam about timeouts trying to wakeup from sleep. I tracked down the commit that was causing that and have partially reverted it here. I have no real knowledge about Broadcom WiFi, but the commit that was causing problems sounds (from the descriptioin) to be a hack commit penalizing all Broadcom WiFi users because of a bug in a Cypress SD controller. I will let others comment if this is truly the case and, if so, what the right solution should be. For v3 of this series I have added 2 patches to the end of the series to address errors that would show up on systems with these same SDIO WiFi cards when used on controllers that do periodic retuning. These systems need an extra fix to prevent the retuning from happening when the card is asleep. I believe v5 of this series is all ready to go assuming Kalle Valo is good with it. I've added after-the-cut notes to patches awaiting his Ack and have added other tags collected so far. Changes in v5: - Add missing sdio_retune_crc_enable() in comments (Ulf). - /s/reneable/re-enable (Ulf). - Remove leftover prototypes: mmc_expect_errors_begin() / end() (Ulf). - Rewording of "sleep command" in commit message (Arend). Changes in v4: - Moved to SDIO API only (Adrian, Ulf). - Renamed to make it less generic, now retune_crc_disable (Ulf). - Function header makes it clear host must be claimed (Ulf). - No more WARN_ON (Ulf). - Adjust to API rename (Adrian, Ulf). - Moved retune hold/release to SDIO API (Adrian). - Adjust to API rename (Adrian). Changes in v3: - Took out the spinlock since I believe this is all in one context. - Expect errors for all of brcmf_sdio_kso_control() (Adrian). - ("mmc: core: Export mmc_retune_hold_now() mmc_retune_release()") new for v3. - ("brcmfmac: sdio: Don't tune while the card is off") new for v3. Changes in v2: - A full revert, not just a partial one (Arend). ...with explicit Cc. - Updated commit message to clarify based on discussion of v1. Douglas Anderson (5): Revert "brcmfmac: disable command decode in sdio_aos" mmc: core: API to temporarily disable retuning for SDIO CRC errors brcmfmac: sdio: Disable auto-tuning around commands expected to fail mmc: core: Add sdio_retune_hold_now() and sdio_retune_release() brcmfmac: sdio: Don't tune while the card is off drivers/mmc/core/core.c | 5 +- drivers/mmc/core/sdio_io.c | 77 +++++++++++++++++++ .../broadcom/brcm80211/brcmfmac/sdio.c | 17 ++-- include/linux/mmc/host.h | 1 + include/linux/mmc/sdio_func.h | 6 ++ 5 files changed, 99 insertions(+), 7 deletions(-) -- 2.22.0.410.gd8fdbe21b5-goog
