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authorDavid S. Miller <davem@davemloft.net>2014-01-16 15:24:00 -0800
committerDavid S. Miller <davem@davemloft.net>2014-01-16 15:24:00 -0800
commit7967919db687f1a61e3d8fbf9f5582f01c8d2cf5 (patch)
tree88edac1c0cdb5c6203a0234c7a2c6d7d8209ab82 /net/ethernet
parent82a342d18a0653723156c98395bb75e9748e8968 (diff)
parent89f7f2cfdd7ade55d5230501c21271690790ceda (diff)
Merge branch 'stmmac_pm'
Srinivas Kandagatla says: ==================== net: stmmac PM related fixes. 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: any 1> Test PM suspend freeze 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. Changes since RFC: - Rebased to net-next on Dave's suggestion. All these patches are Acked by Peppe. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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