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Date: Thu, 19 Jun 2014 18:37:56 +0200
From: Arend van Spriel <arend@...adcom.com>
To: "Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>,
<brudley@...adcom.com>, Franky Lin <frankyl@...adcom.com>,
<meuleman@...adcom.com>, <linville@...driver.com>,
<pieterpg@...adcom.com>, <dekim@...adcom.com>,
<mcgrof@...not-panic.com>, <antonio@...n-mesh.com>,
<johannes.berg@...el.com>
CC: <linux-wireless@...r.kernel.org>,
<brcm80211-dev-list@...adcom.com>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH] brcmfmac: prevent watchdog from interfering with scanning
and connecting
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@...ux.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
commit be138554a7923658ded799b0e8794d9c1d08a6e5
Author: Russell King <rmk+kernel@....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@...ux.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
>>>
>>
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