I'm having resume problems on a system (NVIDIA Tegra Seaboard) that would use the brcmfmac staging driver. When the driver is loaded, suspend and resume (echo mem > /sys/state/power) work fine. However, without the driver loaded, resume works, but 10 seconds later, the kernel hangs a little, and spits out the errors quoted at the end of this email. The hangs interfere with other devices on the system; e.g. audio DMA gets starved and causes audible artifacts. I tracked this down to brcmfmac's suspend function wl_cfg80211_suspend() calling sdioh_sdio_set_host_pm_flags(MMC_PM_KEEP_POWER). I note that the MMC controller suspend/resume path are influenced by MMC_PM_KEEP_POWER, but only when the driver for the attached SDIO device specify that flag, hence it's in host->pm_flags and not just in host->pm_caps. If I hack all the MMC core code to look for (host->pm_caps & MMC_PM_KEEP_POWER) instead of (host->pm_flags & MMC_PM_KEEP_POWER), then suspend/resume works fine even without the brcmfmac driver loaded. I imagine such a change isn't blanket appropriate for the MMC core. Can anyone clue me in on: * Is the call to sdioh_sdio_set_host_pm_flags() just something that masks a somewhat unrelated problem that should be investigated, or a direct fix for this issue? * Is suspend/resume expected to work without the driver in a case like this, or is it a known troublesome area? Note that the call to sdioh_sdio_set_host_pm_flags() was introduced to staging-2.6.git in commit 6b5a5a3eb77ea69382da9d2a64d74107e49cedaa "STAGING: brcm80211 v2 keep power on in suspend state". Thanks! The error spew: [ 45.739276] PM: resume of devices complete after 338.419 msecs [ 46.642802] Restarting tasks ... done. [ 56.697061] mmc2: Timeout waiting for hardware interrupt. [ 56.742333] sdhci: =========== REGISTER DUMP (mmc2)=========== [ 56.791248] sdhci: Sys addr: 0x00000000 | Version: 0x00000001 [ 56.840178] sdhci: Blk size: 0x00000000 | Blk cnt: 0x00000000 [ 56.840216] sdhci: Argument: 0x00010000 | Trn mode: 0x00000000 [ 56.840253] sdhci: Present: 0x1fff0001 | Host ctl: 0x00000001 [ 56.840288] sdhci: Power: 0x00000000 | Blk gap: 0x00000000 [ 56.840322] sdhci: Wake-up: 0x00000000 | Clock: 0x00000000 [ 56.840356] sdhci: Timeout: 0x00000000 | Int stat: 0x00000000 [ 56.840391] sdhci: Int enab: 0x00ff00c3 | Sig enab: 0x00fc00c3 [ 56.840425] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000 [ 56.840460] sdhci: Caps: 0x61ff30b0 | Caps_1: 0x00000000 [ 56.840495] sdhci: Cmd: 0x0000071a | Max curr: 0x00000001 [ 56.840528] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000000 [ 56.840557] sdhci: =========================================== [ 56.850714] mmc2: Controller never released inhibit bit(s). [ 56.850751] sdhci: =========== REGISTER DUMP (mmc2)=========== [ 56.850787] sdhci: Sys addr: 0x00000000 | Version: 0x00000001 [ 56.850822] sdhci: Blk size: 0x00000000 | Blk cnt: 0x00000000 [ 56.850858] sdhci: Argument: 0x00010000 | Trn mode: 0x00000000 [ 56.850894] sdhci: Present: 0x1fff0001 | Host ctl: 0x00000001 [ 56.850928] sdhci: Power: 0x00000000 | Blk gap: 0x00000000 [ 56.850961] sdhci: Wake-up: 0x00000000 | Clock: 0x00000000 [ 56.850995] sdhci: Timeout: 0x00000000 | Int stat: 0x00000000 [ 56.851030] sdhci: Int enab: 0x00ff00c3 | Sig enab: 0x00fc00c3 [ 56.851064] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000 [ 56.851099] sdhci: Caps: 0x61ff30b0 | Caps_1: 0x00000000 [ 56.851134] sdhci: Cmd: 0x0000071a | Max curr: 0x00000001 [ 56.851167] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000000 [ 56.851196] sdhci: =========================================== [ 56.861317] mmc2: Controller never released inhibit bit(s). [ 56.861352] sdhci: =========== REGISTER DUMP (mmc2)=========== [ 56.861387] sdhci: Sys addr: 0x00000000 | Version: 0x00000001 [ 56.861422] sdhci: Blk size: 0x00000000 | Blk cnt: 0x00000000 [ 56.861456] sdhci: Argument: 0x00010000 | Trn mode: 0x00000000 [ 56.861491] sdhci: Present: 0x1fff0001 | Host ctl: 0x00000001 [ 56.861524] sdhci: Power: 0x00000000 | Blk gap: 0x00000000 [ 56.861558] sdhci: Wake-up: 0x00000000 | Clock: 0x00000000 [ 56.861591] sdhci: Timeout: 0x00000000 | Int stat: 0x00000000 [ 56.8n1626] sdhci: Int enab: 0x00ff00c3 | Sig enab: 0x00fc00c3 [ 56.861659] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000 [ 56.861694] sdhci: Caps: 0x61ff30b0 | Caps_1: 0x00000000 [ 56.861728] sdhci: Cmd: 0x0000071a | Max curr: 0x00000001 [ 56.861761] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000000 [ 56.861790] sdhci: =========================================== [ 56.871906] mmc2: Controller never released inhibit bit(s). [ 56.871940] sdhci: =========== REGISTER DUMP (mmc2)=========== [ 56.871976] sdhci: Sys addr: 0x00000000 | Version: 0x00000001 [ 56.872010] sdhci: Blk size: 0x00000000 | Blk cnt: 0x00000000 [ 56.872045] sdhci: Argument: 0x00010000 | Trn mode: 0x00000000 [ 56.872080] sdhci: Present: 0x1fff0001 | Host ctl: 0x00000001 [ 56.872112] sdhci: Power: 0x00000000 | Blk gap: 0x00000000 [ 56.872146] sdhci: Wake-up: 0x00000000 | Clock: 0x00000000 [ 56.872179] sdhci: Timeout: 0x00000000 | Int stat: 0x00000000 [ 56.872214] sdhci: Int enab: 0x00ff00c3 | Sig enab: 0x00fc00c3 [ 56.872247] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000 [ 56.872282] sdhci: Caps: 0x61ff30b0 | Caps_1: 0x00000000 [ 56.872315] sdhci: Cmd: 0x0000071a | Max curr: 0x00000001 [ 56.872348] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000000 [ 56.872377] sdhci: =========================================== [ 56.876637] mmc2: card 0001 removed Then, the kernel appears to enumerate the card again, auto-loads the driver (which doesn't happen at boot; I haven't fully investigated why), and from that point on, IIRC, suspend/resume work OK: [ 59.679982] mmc2: queuing unknown CIS tuple 0x80 (50 bytes) [ 59.687842] mmc2: queuing unknown CIS tuple 0x80 (7 bytes) [ 59.690668] mmc2: queuing unknown CIS tuple 0x80 (7 bytes) [ 59.697879] mmc2: queuing unknown CIS tuple 0x80 (19 bytes) [ 59.716700] mmc2: queuing unknown CIS tuple 0x02 (1 bytes) [ 59.719648] mmc2: new SDIO card at address 0001 [ 60.012255] brcmutil: module is from the staging directory, the quality is unknown, you have been warned. [ 60.012270] brcmutil: module is from the staging directory, the quality is unknown, you have been warned. [ 60.029470] brcmutil: module is from the staging directory, the quality is unknown, you have been warned. [ 60.383075] cfg80211: Calling CRDA to update world regulatory domain [ 60.466156] brcmfmac: module is from the staging directory, the quality is unknown, you have been warned. [ 60.469614] brcmfmac: module is from the staging directory, the quality is unknown, you have been warned. [ 60.479732] brcmfmac: module is from the staging directory, the quality is unknown, you have been warned. [ 60.709134] No SDIO Drive strength initdone for chip 4329 rev 3 pmurev 6 [ 60.766006] DHD: dongle ram size is set to 294912(orig 294912) [ 60.854818] ERROR @wl_cfg80211_request_fw : Could not download fw (-2) [ 60.909985] _dhdsdio_download_firmware: dongle image file download failed [ 61.137195] dhd_bus_start: dhdsdio_probe_download failed. firmware = brcm/bcm4329-fullmac-4.bin nvram = brcm/bcm4329-fullmac-4.txt -- nvpublic -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
