When Broadcom SDIO cards are idled they go to sleep and a whole separate subsystem takes over their SDIO communication. This is the Always-On-Subsystem (AOS) and it can't handle tuning requests.
Specifically, as tested on rk3288-veyron-minnie (which reports having BCM4354/1 in dmesg), if I force a retune in brcmf_sdio_kso_control() when "on = 1" (aka we're transition from sleep to wake) by whacking: bus->sdiodev->func1->card->host->need_retune = 1 ...then I can often see tuning fail. In this case dw_mmc reports "All phases bad!"). Note that I don't get 100% failure, presumably because sometimes the card itself has already transitioned away from the AOS itself by the time we try to wake it up. If I force retuning when "on = 0" (AKA force retuning right before sending the command to go to sleep) then retuning is always OK.
NOTE: we need _both_ this patch and the patch to avoid triggering tuning due to CRC errors in the sleep/wake transition, AKA ("brcmfmac: sdio: Disable auto-tuning around commands expected to fail"). Though both patches handle issues with Broadcom's AOS, the problems are distinct: 1. We want to defer (but not ignore) asynchronous (like timer-requested) tuning requests till the card is awake. However, we want to ignore CRC errors during the transition, we don't want to queue deferred tuning request. 2. You could imagine that the AOS could implement retuning but we could still get errors while transitioning in and out of the AOS. Similarly you could imagine a seamless transition into and out of the AOS (with no CRC errors) even if the AOS couldn't handle tuning.
ALSO NOTE: presumably there is never a desperate need to retune in order to wake up the card, since doing so is impossible. Luckily the only way the card can get into sleep state is if we had a good enough tuning to send it the command to put it into sleep, so presumably that "good enough" tuning is enough to wake us up, at least with a few retries.
Cc: stable@vger.kernel.org Signed-off-by: Douglas Anderson dianders@chromium.org Acked-by: Adrian Hunter adrian.hunter@intel.com Reviewed-by: Arend van Spriel arend.vanspriel@broadcom.com --- Patches #2 - #5 will go through Ulf's tree.
This patch is still lacking Kalle Valo's Ack, which should probably be received before landing in Ulf's tree.
I've CCed stable@ here without a version tag. As per Adrian Hunter this patch applies cleanly to 4.18+ so that would be an easy first target. However, if someone were so inclined they could provide further backports. As per Adrian [1] the root problem has existed for ~4 years.
[1] https://lkml.kernel.org/r/4f39e152-04ba-a64e-985a-df93e6d15ff8@intel.com
Changes in v5: - Rewording of "sleep command" in commit message (Arend).
Changes in v4: - Adjust to API rename (Adrian).
Changes in v3: - ("brcmfmac: sdio: Don't tune while the card is off") new for v3.
Changes in v2: None
drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c index ee76593259a7..629140b6d7e2 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c @@ -669,6 +669,10 @@ brcmf_sdio_kso_control(struct brcmf_sdio *bus, bool on)
sdio_retune_crc_disable(bus->sdiodev->func1);
+ /* Cannot re-tune if device is asleep; defer till we're awake */ + if (on) + sdio_retune_hold_now(bus->sdiodev->func1); + wr_val = (on << SBSDIO_FUNC1_SLEEPCSR_KSO_SHIFT); /* 1st KSO write goes to AOS wake up core if device is asleep */ brcmf_sdiod_writeb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR, wr_val, &err); @@ -729,6 +733,9 @@ brcmf_sdio_kso_control(struct brcmf_sdio *bus, bool on) if (try_cnt > MAX_KSO_ATTEMPTS) brcmf_err("max tries: rd_val=0x%x err=%d\n", rd_val, err);
+ if (on) + sdio_retune_release(bus->sdiodev->func1); + sdio_retune_crc_enable(bus->sdiodev->func1);
return err;