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Date: Mon, 4 Aug 2014 19:29:04 +0200
From: Arend van Spriel <arend@...adcom.com>
To: "Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
CC: <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>, <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 08/04/14 18:36, Fu, Zhonghui wrote:
>
> On 2014/7/24 23:22, Fu, Zhonghui wrote:
>> 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@...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
>
> Hi, Arend
>
> I investigated this issue, and its root cause is still that sdio controller can't receive interrupts from WiFi chip on sdio bus when sdio controller is in runtime suspend status. I am running 3.16-rc5 linux kernel on ASUS T100TA tablet, and using sdhci-acpi driver.
Thanks, Zhonghui
Given that the patches Russell made were covering sdhci (as far as I
recall) your issue may be specific to the sdhci-acpi driver. In
sdhci_acpi_probe() it is enabled by use_runtime_pm field in private data:
c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
Regards,
Arend
> Thanks,
> Zhonghui
>> 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@....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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