[PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Fu, Zhonghui]

>From a05d35ab334c20970c236fb971dae88810078c88 Mon Sep 17 00:00:00 2001
From: Fu Zhonghui <zhonghui.fu@linux.intel.com>
Date: Thu, 12 Feb 2015 10:49:35 +0800
Subject: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

WiFi chip has 2 SDIO functions, and PM core will trigger
twice suspend/resume operations for one WiFi chip to do
the same things. This patch avoid this case.

Acked-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Fu Zhonghui <zhonghui.fu@linux.intel.com>
---
Changes in v3:
- Rebase to wireless-drivers-next/master branch

 drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
index 7944224..b8832a7 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
@@ -1117,9 +1117,13 @@ static int brcmf_ops_sdio_suspend(struct device *dev)
 	struct brcmf_bus *bus_if;
 	struct brcmf_sdio_dev *sdiodev;
 	mmc_pm_flag_t sdio_flags;
+	struct sdio_func *func = dev_to_sdio_func(dev);
 
 	brcmf_dbg(SDIO, "Enter\n");
 
+	if (func->num == 2)
+		return 0;
+
 	bus_if = dev_get_drvdata(dev);
 	sdiodev = bus_if->bus_priv.sdio;
 
@@ -1148,9 +1152,16 @@ static int brcmf_ops_sdio_suspend(struct device *dev)
 static int brcmf_ops_sdio_resume(struct device *dev)
 {
 	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
-	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
+	struct brcmf_sdio_dev *sdiodev;
+	struct sdio_func *func = dev_to_sdio_func(dev);
 
 	brcmf_dbg(SDIO, "Enter\n");
+
+	if (func->num == 2)
+		return 0;
+
+	sdiodev = bus_if->bus_priv.sdio;
+
 	if (sdiodev->pdata && sdiodev->pdata->oob_irq_supported)
 		disable_irq_wake(sdiodev->pdata->oob_irq_nr);
 	brcmf_sdio_wd_timer(sdiodev->bus, BRCMF_WD_POLL_MS);
-- 1.9.1

Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Fu, Zhonghui]

Any comments to this patch? Can it be accepted?

Thanks,
Zhonghui

On 2015/2/12 11:26, Fu, Zhonghui wrote:
> From a05d35ab334c20970c236fb971dae88810078c88 Mon Sep 17 00:00:00 2001
> From: Fu Zhonghui <zhonghui.fu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> Date: Thu, 12 Feb 2015 10:49:35 +0800
> Subject: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation
>
> WiFi chip has 2 SDIO functions, and PM core will trigger
> twice suspend/resume operations for one WiFi chip to do
> the same things. This patch avoid this case.
>
> Acked-by: Arend van Spriel <arend-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Signed-off-by: Fu Zhonghui <zhonghui.fu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> ---
> Changes in v3:
> - Rebase to wireless-drivers-next/master branch
>
>  drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
> index 7944224..b8832a7 100644
> --- a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
> +++ b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
> @@ -1117,9 +1117,13 @@ static int brcmf_ops_sdio_suspend(struct device *dev)
>  	struct brcmf_bus *bus_if;
>  	struct brcmf_sdio_dev *sdiodev;
>  	mmc_pm_flag_t sdio_flags;
> +	struct sdio_func *func = dev_to_sdio_func(dev);
>  
>  	brcmf_dbg(SDIO, "Enter\n");
>  
> +	if (func->num == 2)
> +		return 0;
> +
>  	bus_if = dev_get_drvdata(dev);
>  	sdiodev = bus_if->bus_priv.sdio;
>  
> @@ -1148,9 +1152,16 @@ static int brcmf_ops_sdio_suspend(struct device *dev)
>  static int brcmf_ops_sdio_resume(struct device *dev)
>  {
>  	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
> -	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
> +	struct brcmf_sdio_dev *sdiodev;
> +	struct sdio_func *func = dev_to_sdio_func(dev);
>  
>  	brcmf_dbg(SDIO, "Enter\n");
> +
> +	if (func->num == 2)
> +		return 0;
> +
> +	sdiodev = bus_if->bus_priv.sdio;
> +
>  	if (sdiodev->pdata && sdiodev->pdata->oob_irq_supported)
>  		disable_irq_wake(sdiodev->pdata->oob_irq_nr);
>  	brcmf_sdio_wd_timer(sdiodev->bus, BRCMF_WD_POLL_MS);
> -- 1.9.1
>

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Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Pat Erley]

On 02/14/2015 08:40 PM, Fu, Zhonghui wrote:
>
> Any comments to this patch? Can it be accepted?
>
> Thanks,
> Zhonghui
>
> On 2015/2/12 11:26, Fu, Zhonghui wrote:
>>  From a05d35ab334c20970c236fb971dae88810078c88 Mon Sep 17 00:00:00 2001
>> From: Fu Zhonghui <zhonghui.fu@linux.intel.com>
>> Date: Thu, 12 Feb 2015 10:49:35 +0800
>> Subject: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation
>>
>> WiFi chip has 2 SDIO functions, and PM core will trigger
>> twice suspend/resume operations for one WiFi chip to do
>> the same things. This patch avoid this case.
>>
>> Acked-by: Arend van Spriel <arend@broadcom.com>
>> Signed-off-by: Fu Zhonghui <zhonghui.fu@linux.intel.com>
>> ---
>> Changes in v3:
>> - Rebase to wireless-drivers-next/master branch
>>
>>   drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c | 13 ++++++++++++-
>>   1 file changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
>> index 7944224..b8832a7 100644
>> --- a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
>> +++ b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
>> @@ -1117,9 +1117,13 @@ static int brcmf_ops_sdio_suspend(struct device *dev)
>>   	struct brcmf_bus *bus_if;
>>   	struct brcmf_sdio_dev *sdiodev;
>>   	mmc_pm_flag_t sdio_flags;
>> +	struct sdio_func *func = dev_to_sdio_func(dev);
>>
>>   	brcmf_dbg(SDIO, "Enter\n");
>>
>> +	if (func->num == 2)
>> +		return 0;
>> +

Should it be >= 2 instead of == 2 so that if, in the future, a 3+
SDIO function chip comes out, it's already handled?  Not that that
should hold up the patch or anything, just a curiosity.

>>   	bus_if = dev_get_drvdata(dev);
>>   	sdiodev = bus_if->bus_priv.sdio;
>>
>> @@ -1148,9 +1152,16 @@ static int brcmf_ops_sdio_suspend(struct device *dev)
>>   static int brcmf_ops_sdio_resume(struct device *dev)
>>   {
>>   	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
>> -	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
>> +	struct brcmf_sdio_dev *sdiodev;
>> +	struct sdio_func *func = dev_to_sdio_func(dev);
>>
>>   	brcmf_dbg(SDIO, "Enter\n");
>> +
>> +	if (func->num == 2)
>> +		return 0;
>> +
>> +	sdiodev = bus_if->bus_priv.sdio;
>> +
>>   	if (sdiodev->pdata && sdiodev->pdata->oob_irq_supported)
>>   		disable_irq_wake(sdiodev->pdata->oob_irq_nr);
>>   	brcmf_sdio_wd_timer(sdiodev->bus, BRCMF_WD_POLL_MS);
>> -- 1.9.1
>>
>
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Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Arend van Spriel]

On 02/15/15 04:27, Pat Erley wrote:
> On 02/14/2015 08:40 PM, Fu, Zhonghui wrote:
>>
>> Any comments to this patch? Can it be accepted?

I assume that patches are queued up until after the merge window that we 
are currently in.

>> Thanks,
>> Zhonghui
>>
>> On 2015/2/12 11:26, Fu, Zhonghui wrote:
>>> From a05d35ab334c20970c236fb971dae88810078c88 Mon Sep 17 00:00:00 2001
>>> From: Fu Zhonghui <zhonghui.fu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
>>> Date: Thu, 12 Feb 2015 10:49:35 +0800
>>> Subject: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation
>>>
>>> WiFi chip has 2 SDIO functions, and PM core will trigger
>>> twice suspend/resume operations for one WiFi chip to do
>>> the same things. This patch avoid this case.
>>>
>>> Acked-by: Arend van Spriel <arend-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>> Signed-off-by: Fu Zhonghui <zhonghui.fu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
>>> ---
>>> Changes in v3:
>>> - Rebase to wireless-drivers-next/master branch
>>>
>>> drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c | 13 ++++++++++++-
>>> 1 file changed, 12 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
>>> b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
>>> index 7944224..b8832a7 100644
>>> --- a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
>>> +++ b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
>>> @@ -1117,9 +1117,13 @@ static int brcmf_ops_sdio_suspend(struct
>>> device *dev)
>>> struct brcmf_bus *bus_if;
>>> struct brcmf_sdio_dev *sdiodev;
>>> mmc_pm_flag_t sdio_flags;
>>> + struct sdio_func *func = dev_to_sdio_func(dev);
>>>
>>> brcmf_dbg(SDIO, "Enter\n");
>>>
>>> + if (func->num == 2)
>>> + return 0;
>>> +
>
> Should it be >= 2 instead of == 2 so that if, in the future, a 3+
> SDIO function chip comes out, it's already handled? Not that that
> should hold up the patch or anything, just a curiosity.

The driver only claims functions 1 and 2 during the probe so that assure 
it works for SDIO devices that have more than two functions.

Regards,
Arend

>>> bus_if = dev_get_drvdata(dev);
>>> sdiodev = bus_if->bus_priv.sdio;
>>>
>>> @@ -1148,9 +1152,16 @@ static int brcmf_ops_sdio_suspend(struct
>>> device *dev)
>>> static int brcmf_ops_sdio_resume(struct device *dev)
>>> {
>>> struct brcmf_bus *bus_if = dev_get_drvdata(dev);
>>> - struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
>>> + struct brcmf_sdio_dev *sdiodev;
>>> + struct sdio_func *func = dev_to_sdio_func(dev);
>>>
>>> brcmf_dbg(SDIO, "Enter\n");
>>> +
>>> + if (func->num == 2)
>>> + return 0;
>>> +
>>> + sdiodev = bus_if->bus_priv.sdio;
>>> +
>>> if (sdiodev->pdata && sdiodev->pdata->oob_irq_supported)
>>> disable_irq_wake(sdiodev->pdata->oob_irq_nr);
>>> brcmf_sdio_wd_timer(sdiodev->bus, BRCMF_WD_POLL_MS);
>>> -- 1.9.1
>>>
>>
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>

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Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Kalle Valo]

Arend van Spriel <arend@broadcom.com> writes:

> On 02/15/15 04:27, Pat Erley wrote:
>> On 02/14/2015 08:40 PM, Fu, Zhonghui wrote:
>>>
>>> Any comments to this patch? Can it be accepted?
>
> I assume that patches are queued up until after the merge window that
> we are currently in.

That's right. In the future I will most likely apply patches also during
the merge window, but as I'm still a greenhorn I'll be on the safe and
wait for the merge window to end.

-- 
Kalle Valo

Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Fu, Zhonghui]

On 2015/2/15 22:54, Kalle Valo wrote:
> Arend van Spriel <arend-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> writes:
>
>> On 02/15/15 04:27, Pat Erley wrote:
>>> On 02/14/2015 08:40 PM, Fu, Zhonghui wrote:
>>>> Any comments to this patch? Can it be accepted?
>> I assume that patches are queued up until after the merge window that
>> we are currently in.
> That's right. In the future I will most likely apply patches also during
> the merge window, but as I'm still a greenhorn I'll be on the safe and
> wait for the merge window to end.
I am very glad to see this.
Could you please tell which release candidate this patch will be likely merged into now?


Thanks,
Zhonghui

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Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Arend van Spriel]

On 02/16/15 08:34, Fu, Zhonghui wrote:
>
> On 2015/2/15 22:54, Kalle Valo wrote:
>> Arend van Spriel<arend@broadcom.com>  writes:
>>
>>> On 02/15/15 04:27, Pat Erley wrote:
>>>> On 02/14/2015 08:40 PM, Fu, Zhonghui wrote:
>>>>> Any comments to this patch? Can it be accepted?
>>> I assume that patches are queued up until after the merge window that
>>> we are currently in.
>> That's right. In the future I will most likely apply patches also during
>> the merge window, but as I'm still a greenhorn I'll be on the safe and
>> wait for the merge window to end.
> I am very glad to see this.
> Could you please tell which release candidate this patch will be likely merged into now?

For which tree are you asking this? When the merge window ends and 
linus' tree has moved to 3.20-rc1, the wireless-drivers-next will move 
to that -rc1 as well and pending/accepted patches will be applied for 
the next kernel release. If you are asking when they will be in linus' 
tree than the answer is 3.21-rc1. Now if you say this patch solves a 
real problem for you (providing usual proof like log with stack trace) 
you can request it to go on the wireless-drivers tree to be fixed for 3.20.

Regards,
Arend

Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Fu, Zhonghui]

On 2015/2/16 17:35, Arend van Spriel wrote:
> On 02/16/15 08:34, Fu, Zhonghui wrote:
>>
>> On 2015/2/15 22:54, Kalle Valo wrote:
>>> Arend van Spriel<arend@broadcom.com>  writes:
>>>
>>>> On 02/15/15 04:27, Pat Erley wrote:
>>>>> On 02/14/2015 08:40 PM, Fu, Zhonghui wrote:
>>>>>> Any comments to this patch? Can it be accepted?
>>>> I assume that patches are queued up until after the merge window that
>>>> we are currently in.
>>> That's right. In the future I will most likely apply patches also during
>>> the merge window, but as I'm still a greenhorn I'll be on the safe and
>>> wait for the merge window to end.
>> I am very glad to see this.
>> Could you please tell which release candidate this patch will be likely merged into now?
>
> For which tree are you asking this? When the merge window ends and linus' tree has moved to 3.20-rc1, the wireless-drivers-next will move to that -rc1 as well and pending/accepted patches will be applied for the next kernel release. If you are asking when they will be in linus' tree than the answer is 3.21-rc1. Now if you say this patch solves a real problem for you (providing usual proof like log with stack trace) you can request it to go on the wireless-drivers tree to be fixed for 3.20.

I was in Chinese new-year vacation these few days. So sorry for late response.

Many thanks for your explanation first. 

Now that there is not 3.20 version. My understanding is that this patch will be in linus' tree 4.1-rc1, right?


Thanks,
Zhonghui

>
> Regards,
> Arend
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Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Arend van Spriel]

On 02/27/15 08:53, Fu, Zhonghui wrote:
>
> On 2015/2/16 17:35, Arend van Spriel wrote:
>> On 02/16/15 08:34, Fu, Zhonghui wrote:
>>>
>>> On 2015/2/15 22:54, Kalle Valo wrote:
>>>> Arend van Spriel<arend@broadcom.com>   writes:
>>>>
>>>>> On 02/15/15 04:27, Pat Erley wrote:
>>>>>> On 02/14/2015 08:40 PM, Fu, Zhonghui wrote:
>>>>>>> Any comments to this patch? Can it be accepted?
>>>>> I assume that patches are queued up until after the merge window that
>>>>> we are currently in.
>>>> That's right. In the future I will most likely apply patches also during
>>>> the merge window, but as I'm still a greenhorn I'll be on the safe and
>>>> wait for the merge window to end.
>>> I am very glad to see this.
>>> Could you please tell which release candidate this patch will be likely merged into now?
>>
>> For which tree are you asking this? When the merge window ends and linus' tree has moved to 3.20-rc1, the wireless-drivers-next will move to that -rc1 as well and pending/accepted patches will be applied for the next kernel release. If you are asking when they will be in linus' tree than the answer is 3.21-rc1. Now if you say this patch solves a real problem for you (providing usual proof like log with stack trace) you can request it to go on the wireless-drivers tree to be fixed for 3.20.
>
> I was in Chinese new-year vacation these few days. So sorry for late response.
>
> Many thanks for your explanation first.
>
> Now that there is not 3.20 version. My understanding is that this patch will be in linus' tree 4.1-rc1, right?

Yes. It will go into linux-next first, which you can consider to be an 
incubator where all stuff for the next release is integrated. Stuff will 
be added there until 4.0 is released. At that moment the merge window 
starts which moves all the stuff from linux-next into the mainline linux 
repo to prepare 4.1-rc1.

Now regarding your patch I have to give a heads up. Our pending patches 
have been applied by Kalle and includes similar fix.

Regards,
Arend

>
> Thanks,
> Zhonghui
>
>>
>> Regards,
>> Arend
>> --
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>
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Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Kalle Valo]

Arend van Spriel <arend@broadcom.com> writes:

>> Now that there is not 3.20 version. My understanding is that this
>> patch will be in linus' tree 4.1-rc1, right?
>
> Yes. It will go into linux-next first, which you can consider to be an
> incubator where all stuff for the next release is integrated. Stuff
> will be added there until 4.0 is released. At that moment the merge
> window starts which moves all the stuff from linux-next into the
> mainline linux repo to prepare 4.1-rc1.
>
> Now regarding your patch I have to give a heads up. Our pending
> patches have been applied by Kalle and includes similar fix.

Yeah, Zhonghui's patch doesn't apply anymore. There is similar code in
wireless-drivers-next but still a bit different. So what should we do?
Is the driver ok now?

-- 
Kalle Valo

Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Arend van Spriel]

On 03/02/15 16:08, Kalle Valo wrote:
> Arend van Spriel<arend@broadcom.com>  writes:
>
>>> Now that there is not 3.20 version. My understanding is that this
>>> patch will be in linus' tree 4.1-rc1, right?
>>
>> Yes. It will go into linux-next first, which you can consider to be an
>> incubator where all stuff for the next release is integrated. Stuff
>> will be added there until 4.0 is released. At that moment the merge
>> window starts which moves all the stuff from linux-next into the
>> mainline linux repo to prepare 4.1-rc1.
>>
>> Now regarding your patch I have to give a heads up. Our pending
>> patches have been applied by Kalle and includes similar fix.
>
> Yeah, Zhonghui's patch doesn't apply anymore. There is similar code in
> wireless-drivers-next but still a bit different. So what should we do?
> Is the driver ok now?

The idea of Zhonghui's patch was to avoid entering suspend and resume 
callbacks twice. The current behavior is same as his patch intended so 
yes the driver is ok (pending undiscovered bugs :-p ).

Regards,
Arend

RE: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[David Laight]

> > WiFi chip has 2 SDIO functions, and PM core will trigger
> > twice suspend/resume operations for one WiFi chip to do
> > the same things. This patch avoid this case.

Do you want to suspend on the first or last request?

In general it might be that one function is in use and
something wants to suspend the other (as inactive).

If they suspend together you might need to pretend the
first function is suspended but only do the real power-saving
device suspend when all the functions have been suspended.

	David

Re: [PATCH v3] brcmfmac: avoid duplicated suspend/resume operation

[Fu, Zhonghui]

On 2015/2/16 17:50, David Laight wrote:
>>> WiFi chip has 2 SDIO functions, and PM core will trigger
>>> twice suspend/resume operations for one WiFi chip to do
>>> the same things. This patch avoid this case.
> Do you want to suspend on the first or last request?
>
> In general it might be that one function is in use and
> something wants to suspend the other (as inactive).
>
> If they suspend together you might need to pretend the
> first function is suspended but only do the real power-saving
> device suspend when all the functions have been suspended.
I was in Chinese new-year vacation these few days. So sorry for late response.

Suspend/Resume entry functions of brcmfmac driver does not differentiate between two functions, performs the same operations instead.


Thanks,
Zhonghui
>
> 	David
>
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