linux-kernel - RE: [PATCH v2] PCI: designware: move remaining rc setup code to dw_pcie_setup

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Date:	Thu, 14 Apr 2016 13:13:08 +0000
From:	Gabriele Paoloni <gabriele.paoloni@...wei.com>
To:	Pratyush Anand <pratyush.anand@...il.com>,
	Jingoo Han <jingoohan1@...il.com>
CC:	Bjorn Helgaas <helgaas@...nel.org>,
	Jisheng Zhang <jszhang@...vell.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v2] PCI: designware: move remaining rc setup code to
 dw_pcie_setup_rc()

Hi Pratyush 

thanks for you reply 

> -----Original Message-----
> From: Pratyush Anand [mailto:pratyush.anand@...il.com]
> Sent: 14 April 2016 14:08
> To: Jingoo Han; Gabriele Paoloni
> Cc: Bjorn Helgaas; Jisheng Zhang; Bjorn Helgaas; linux-
> pci@...r.kernel.org; linux-kernel@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org
> Subject: Re: [PATCH v2] PCI: designware: move remaining rc setup code
> to dw_pcie_setup_rc()
> 
> Hi Gabriele,
> 
> On Thu, Apr 14, 2016 at 5:22 PM, Jingoo Han <jingoohan1@...il.com>
> wrote:
> > On Wednesday, April 13, 2016 4:58 PM, Gabriele Paoloni wrote:
> >>
> >> Hi Jingoo
> >>
> >> On 13 April 2016 06:52, Jingoo Han wrote:
> >> > On Tuesday, April 12, 2016 6:44 PM, Gabriele Paoloni wrote:
> 
> [...]
> 
> >> > > So I will update the driver to call dw_pcie_setup_rc() from
> >> > > .host_init and ask the BIOS team to update the firmware for next
> >> > > releases (the driver will be backward compatible anyway).
> >> > >
> >> > > Also during my investigation I have noticed that in
> >> > dw_pcie_setup_rc()
> >> > > http://lxr.free-electrons.com/source/drivers/pci/host/pcie-
> >> > designware.c#L762
> >> > >
> >> > > we use pp->mem_base rather than pp->mem_bus_addr to setup
> >> > > memory base and memory limit in the Type1 header...I think this
> >> > > is wrong right?
> 
> Yes. RC's "memory base" and "memory limit" should be governed by PCI
> addresses and not CPU addresses. So, it should use pp->mem_bus_addr.
> 
> >> > > Also I do not see why this code is needed at all since we
> overwrite
> >> > > this register when we call pci_bus_assign_resources(bus) that
> >> > > will end up in calling pci_setup_bridge() and then
> >> > > pci_setup_bridge_mmio()...?
> >>
> >> Do you have any comment on this issue above?
> 
> Probably thats why things are working.
> Thanks for finding it. I think, /* setup memory base, memory limit */
> hunk can be removed from dw_pcie_setup_rc.

Great, I'll send out a patch to remove this

Thanks

Gab

> 
> ~Pratyush