Re: [PATCH V4 3/3] powerpc/fsl-pci: Unify pci/pcie initialization code

On 08/07/2012 10:57 PM, Jia Hongtao-B38951 wrote:

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-----Original Message-----
From: Wood Scott-B07421
Sent: Tuesday, August 07, 2012 11:20 PM
To: Jia Hongtao-B38951
Cc: Wood Scott-B07421; Kumar Gala; linuxppc-dev@lists.ozlabs.org; Li
Yang-R58472
Subject: Re: [PATCH V4 3/3] powerpc/fsl-pci: Unify pci/pcie
initialization code

On 08/07/2012 01:23 AM, Jia Hongtao-B38951 wrote:

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-----Original Message-----
From: Wood Scott-B07421
Sent: Monday, August 06, 2012 11:16 PM
To: Jia Hongtao-B38951
Cc: Wood Scott-B07421; Kumar Gala; linuxppc-dev@lists.ozlabs.org; Li
Yang-R58472
Subject: Re: [PATCH V4 3/3] powerpc/fsl-pci: Unify pci/pcie
initialization code

On 08/05/2012 09:39 PM, Jia Hongtao-B38951 wrote:

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-----Original Message-----
From: Wood Scott-B07421
Sent: Saturday, August 04, 2012 12:04 AM
To: Jia Hongtao-B38951
Cc: Kumar Gala; linuxppc-dev@lists.ozlabs.org; Wood Scott-B07421; Li
Yang-R58472
Subject: Re: [PATCH V4 3/3] powerpc/fsl-pci: Unify pci/pcie
initialization code

On 08/02/2012 10:39 PM, Jia Hongtao-B38951 wrote:

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-----Original Message-----
From: Kumar Gala [mailto:galak@kernel.crashing.org]
Sent: Thursday, August 02, 2012 8:24 PM
To: Jia Hongtao-B38951
Cc: linuxppc-dev@lists.ozlabs.org; Wood Scott-B07421; Li
Yang-R58472
Subject: Re: [PATCH V4 3/3] powerpc/fsl-pci: Unify pci/pcie
initialization code

You need to convert all boards to use fsl_pci_init before this

patch.

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Otherwise we'll end up with PCI getting initialized twice on

boards.

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- k

If we covert all boards with platform driver in this patch PCI will
be initialized only once without converting all boards to use
fsl_pci_init first.

Then we'd have to pick apart core changes from board changes when
reviewing.

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If we convert all boards to use fsl_pci_init before this patch and
convert them to use platform driver again after this patch. Then
between this patch and next pci will be initialized twice too.

Why?  That one patch should both create the platform driver and
remove the init from fsl_pci_init() -- except things like primary

bus

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detection which has to happen globally.

-Scott

"One patch both create the platform driver and remove the init from
fsl_pci_init()" means we should create platform driver and applied to
all boards. If so why not just directly convert all boards using
platform driver?

Because it's harder to review when you have a bunch of board code in

the

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patch in addition to core changes.

Because you might want people to actually test on the boards in

question

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when converting, especially given the change in how primary buses are
determined, and that some boards may need to provide their own
alternative.

-Scott

But if we separate the core changes and the boards update, between this

two

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patches PCI will be initialized twice.

As I said earlier, you can remove the initcall and require boards to
manually call fsl_pci_init() until all boards are converted.

-Scott

As I said earlier, I can do this but it does not solve the twice-init problem.

I must have missed it.  Why does it not solve the problem?  If a board
doesn't call fsl_pci_init(), the platform driver doesn't get registered.

If I do this first and then add platform driver we also have to convert all
boards using platform driver in the same patch.

We finally using the platform driver so Why do you keep insisting on converting
all boards using fsl_pci_init() first even it does no improvement.

What we're asking for is bisectability (don't have any intermediate
stages where PCI gets initialized twice), and the ability to have a
smooth transition where boards can be converted as people are able to
test them and look into their individual needs regarding primary bus.

-Scott