Re: [PATCH] brcmfmac: prevent watchdog from interfering with scanning and connecting

["Fu, Zhonghui" <zhonghui.fu@linux.intel.com>]

On 2014/7/21 15:42, Fu, Zhonghui wrote:
> On 2014/6/20 0:37, Arend van Spriel wrote:
>> On 19-06-14 18:28, Fu, Zhonghui wrote:
>>> On 2014/6/16 16:15, Arend van Spriel wrote:
>>>> On 16-06-14 07:49, Fu, Zhonghui wrote:
>>>>>   From 14485894add32aedacb3e486ebb2cc2b73861abf Mon Sep 17 00:00:00 2001
>>>>> From: Fu zhonghui <zhonghui.fu@linux.intel.com>
>>>>> Date: Wed, 11 Jun 2014 11:06:55 +0800
>>>>> Subject: [PATCH] brcmfmac: prevent watchdog from interfering with scanning and connecting
>>>>>
>>>>> Watchdog in brcmfmac driver may make WiFi chip enter sleep mode
>>>>> before completion of scanning or connecting.
>>>>>
>>>>> This will lead to scanning or connecting failure.
>>>>>
>>>>> Increasing temporarily idle-time threshold during scanning or
>>>>> connecting can ensure scanning or connecting success without
>>>>> watchdog interference.
>>>> Are you sure you are not having runtime PM enabled. That could be your problem as the host controller code disables sdio irqs. Please see this thread [1]. For our device runtime pm should not be enabled, but I am not sure if that is taken into account in mmc_attach_sdio() (see code below).
>>> I have tried brcmfmac driver with "CONFIG_PM_RUNTIME is not set", and scanning and connecting  always succeeded. This means that CONFIG_PM_RUNTIME should not be set if we use SDIO WiFi device driven by brcmfmac driver, right?
>> Depends which kernel you are using. In 3.16-rc1 the sdio interrupt issue has been fixed so you should be fine to use CONFIG_PM_RUNTIME. Here is the commit
Any clues or comments to the following issue?
> I run 3.16-rc4 and 3.16-rc5 kernel with CONFIG_PM_RUNTIME set, the issue still exists as follows:
>
> 1 step: modprobe brcmfmac
> 2 step: iwlist wlan1 scan         get scanning result successfully.
> 3 step: wait a while, no any operation
> 4 step: iwlist wlan1 scan         scanning timeout, can't get scanning result.
>
>
> Thanks,
> Zhonghui
>
>> commit be138554a7923658ded799b0e8794d9c1d08a6e5
>> Author: Russell King <rmk+kernel@arm.linux.org.uk>
>> Date:   Fri Apr 25 12:55:56 2014 +0100
>>
>>     mmc: sdhci: allow sdio interrupts while sdhci runtime suspended
>>
>> Regards,
>> Arend
>>
>>> Thanks,
>>> Zhonghui
>>>> Gr. AvS
>>>>
>>>> [1] http://www.spinics.net/lists/linux-mmc/msg25978.html
>>>>
>>>> --8<----------------------------------------------------------------
>>>>
>>>>      /*
>>>>       * Enable runtime PM only if supported by host+card+board
>>>>       */
>>>>      if (host->caps & MMC_CAP_POWER_OFF_CARD) {
>>>>          /*
>>>>           * Let runtime PM core know our card is active
>>>>           */
>>>>          err = pm_runtime_set_active(&card->dev);
>>>>          if (err)
>>>>              goto remove;
>>>>
>>>>          /*
>>>>           * Enable runtime PM for this card
>>>>           */
>>>>          pm_runtime_enable(&card->dev);
>>>>      }
>>>>
>>>>> Signed-off-by: Fu zhonghui <zhonghui.fu@linux.intel.com>
>>>>> ---
>>>>>    drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c |   18 ++++++++++++++++--
>>>>>    .../net/wireless/brcm80211/brcmfmac/wl_cfg80211.c  |    3 ++-
>>>>>    2 files changed, 18 insertions(+), 3 deletions(-)
>>>>>
>>>>> diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
>>>>> index 13c89a0..729deab 100644
>>>>> --- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
>>>>> +++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
>>>>> @@ -34,6 +34,7 @@
>>>>>    #include <linux/vmalloc.h>
>>>>>    #include <linux/platform_data/brcmfmac-sdio.h>
>>>>>    #include <linux/moduleparam.h>
>>>>> +#include <net/cfg80211.h>
>>>>>    #include <asm/unaligned.h>
>>>>>    #include <defs.h>
>>>>>    #include <brcmu_wifi.h>
>>>>> @@ -43,6 +44,10 @@
>>>>>    #include "sdio_host.h"
>>>>>    #include "chip.h"
>>>>>    #include "nvram.h"
>>>>> +#include "dhd.h"
>>>>> +#include "fwil_types.h"
>>>>> +#include "p2p.h"
>>>>> +#include "wl_cfg80211.h"
>>>>>
>>>>>    #define DCMD_RESP_TIMEOUT  2000    /* In milli second */
>>>>>
>>>>> @@ -307,6 +312,7 @@ struct rte_console {
>>>>>                         * when idle
>>>>>                         */
>>>>>    #define BRCMF_IDLE_INTERVAL    1
>>>>> +#define BRCMF_IDLE_INTERVAL_SCANNING_CONNECTING    100
>>>>>
>>>>>    #define KSO_WAIT_US 50
>>>>>    #define MAX_KSO_ATTEMPTS (PMU_MAX_TRANSITION_DLY/KSO_WAIT_US)
>>>>> @@ -3613,9 +3619,9 @@ void brcmf_sdio_isr(struct brcmf_sdio *bus)
>>>>>
>>>>>    static bool brcmf_sdio_bus_watchdog(struct brcmf_sdio *bus)
>>>>>    {
>>>>> -#ifdef DEBUG
>>>>>        struct brcmf_bus *bus_if = dev_get_drvdata(bus->sdiodev->dev);
>>>>> -#endif    /* DEBUG */
>>>>> +    struct brcmf_cfg80211_info *cfg = bus_if->drvr->config;
>>>>> +    struct brcmf_if *ifp = cfg->pub->iflist[0];
>>>>>
>>>>>        brcmf_dbg(TIMER, "Enter\n");
>>>>>
>>>>> @@ -3678,6 +3684,14 @@ static bool brcmf_sdio_bus_watchdog(struct brcmf_sdio *bus)
>>>>>
>>>>>        /* On idle timeout clear activity flag and/or turn off clock */
>>>>>        if ((bus->idletime > 0) && (bus->clkstate == CLK_AVAIL)) {
>>>>> +
>>>>> +        if (test_bit(BRCMF_SCAN_STATUS_BUSY, &cfg->scan_status) ||
>>>>> +            test_bit(BRCMF_VIF_STATUS_CONNECTING, &ifp->vif->sme_state)) {
>>>>> +            bus->idletime = BRCMF_IDLE_INTERVAL_SCANNING_CONNECTING;
>>>>> +        } else {
>>>>> +            bus->idletime = BRCMF_IDLE_INTERVAL;
>>>>> +        }
>>>>> +
>>>>>            if (++bus->idlecount >= bus->idletime) {
>>>>>                bus->idlecount = 0;
>>>>>                if (bus->activity) {
>>>>> diff --git a/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c b/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
>>>>> index be19852..e76517e 100644
>>>>> --- a/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
>>>>> +++ b/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
>>>>> @@ -913,6 +913,8 @@ brcmf_cfg80211_escan(struct wiphy *wiphy, struct brcmf_cfg80211_vif *vif,
>>>>>            return -EAGAIN;
>>>>>        }
>>>>>
>>>>> +    set_bit(BRCMF_SCAN_STATUS_BUSY, &cfg->scan_status);
>>>>> +
>>>>>        /* If scan req comes for p2p0, send it over primary I/F */
>>>>>        if (vif == cfg->p2p.bss_idx[P2PAPI_BSSCFG_DEVICE].vif)
>>>>>            vif = cfg->p2p.bss_idx[P2PAPI_BSSCFG_PRIMARY].vif;
>>>>> @@ -933,7 +935,6 @@ brcmf_cfg80211_escan(struct wiphy *wiphy, struct brcmf_cfg80211_vif *vif,
>>>>>        }
>>>>>
>>>>>        cfg->scan_request = request;
>>>>> -    set_bit(BRCMF_SCAN_STATUS_BUSY, &cfg->scan_status);
>>>>>        if (escan_req) {
>>>>>            cfg->escan_info.run = brcmf_run_escan;
>>>>>            err = brcmf_p2p_scan_prep(wiphy, request, vif);
>>>>> -- 1.7.1
>>>>>
>>>> -- 
>>>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>>>> the body of a message to majordomo@vger.kernel.org
>>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>>> Please read the FAQ at  http://www.tux.org/lkml/
>> -- 
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at  http://www.tux.org/lkml/