linux-kernel - Re: [PATCH RFC 0/9]net: stmmac PM related fixes.

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Message-ID: <529C6580.1020304@st.com>
Date:	Mon, 2 Dec 2013 10:48:32 +0000
From:	srinivas kandagatla <srinivas.kandagatla@...com>
To:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
Cc:	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH RFC 0/9]net: stmmac PM related fixes.

Hi Dave,
Do you have any plans to take this series?

Peppe already Acked these series

Please let me know if you want me to rebase these patches on any
particular branch.

Thanks,
srini

On 19/11/13 05:24, Giuseppe CAVALLARO wrote:
> On 11/18/2013 12:30 PM, srinivas.kandagatla@...com wrote:
>> From: Srinivas Kandagatla <srinivas.kandagatla@...com>
>>
>> Hi Peppe,
>>
>> During PM_SUSPEND_FREEZE testing, I have noticed that PM support in
>> STMMAC is
>> partly broken. I had to re-arrange the code to do PM correctly. There
>> were lot
>> of things I did not like personally and some bits did not work in the
>> first
>> place. I thought this is the nice opportunity to clean the mess up.
>>
>> Here is what I did:
>>
>> 1> Test PM suspend freeeze via pm_test
>> It did not work for following reasons.
>>   - If the power to gmac is removed when it enters in low power state.
>> stmmac_resume could not cope up with such behaviour, it was expecting
>> the ip
>> register contents to be still same as before entering low power, This
>> assumption is wrong. So I started to add some code to do Hardware
>> initialization, thats when I started to re-arrange the code. stmmac_open
>> contains both resource and memory allocations and hardware
>> initialization. I
>> had to separate these two things in two different functions.
>>
>> These two patches do that
>>    net: stmmac: move dma allocation to new function
>>    net: stmmac: move hardware setup for stmmac_open to new function
>>
>> And rest of the other patches are fixing the loose ends, things like mdio
>> reset, which might be necessary in cases likes hibernation(I did not
>> test).
>>
>> In hibernation cases the driver was just unregistering with subsystems
>> and
>> releasing resources which I did not like and its not necessary to do
>> this as
>> part of PM. So using the same stmmac_suspend/resume made more sense for
>> hibernation cases than using stmmac_open/release.
>> Also fixed a NULL pointer dereference bug too.
>>
>> 2> Test WOL via PM_SUSPEND_FREEZE
>> Did get an wakeup interrupt, but could not wakeup a freeze system.
>> So I had to add pm_wakeup_event to the driver.
>> net: stmmac: notify the PM core of a wakeup event. patch.
>>
>> Also few patches like
>>    net: stmmac: make stmmac_mdio_reset non-static
>>    net: stmmac: restore pinstate in pm resume.
>> helps the resume function to reset the phy and put back the pins in
>> default
>> state.
>>
>> Comments?
> 
> Srini, as we had internally discussed before sending the patches to the
> net ML, I agreed with your work. Some parts of the PM stuff was fully
> tested on our product kernels (where the PM was a bit different
> especially on HoM) and nobody raised issues to me for this code.
> Also some rework you did, for example to move the dma allocation in
> a new function is fine for me.
> 
> So you continue to have my Acked-by for all.
> 
> peppe
> 
>>
>> Thanks,
>> srini
>>
>> Srinivas Kandagatla (9):
>>    net: stmmac: support max-speed device tree property
>>    net: stmmac: mdio: remove reset gpio free
>>    net: stmmac: move dma allocation to new function
>>    net: stmmac: move hardware setup for stmmac_open to new function
>>    net: stmmac: make stmmac_mdio_reset non-static
>>    net: stmmac: fix power mangement suspend-resume case
>>    net: stmmac: use suspend functions for hibernation
>>    net: stmmac: restore pinstate in pm resume.
>>    net: stmmac: notify the PM core of a wakeup event.
>>
>>   drivers/net/ethernet/stmicro/stmmac/stmmac.h       |    4 +-
>>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |  360
>> ++++++++++----------
>>   drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  |    3 +-
>>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |   51 +--
>>   include/linux/stmmac.h                             |    1 +
>>   5 files changed, 209 insertions(+), 210 deletions(-)
>>
> 
> 
> 

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