[PATCH 1/2] PCI: imx6: Make reset-gpio optional

[Jingoo Han]

On Monday, October 14, 2013 10:18 AM, Marek Vasut wrote:
> > > On Saturday, October 12, 2013 6:29 PM, Marek Vasut wrote:
> > > > > On Fri, Oct 11, 2013 at 04:12:31AM +0200, Marek Vasut wrote:

[.....]

> > > +cc Kishon Vijay Abraham I, Pratyush Anand, Mohit KUMAR
> > >
> > > Yes, right.
> > > "reset-gpio" property can be moved to an optional property.
> > > Also, the patch to fix 'Designware' part such as 'designware-pcie.txt'
> > > can be shared with other related people as below.
> > >
> > >   - Samsung Exynos PCIe: Jingoo Han
> > >   - ST Spear PCIe: Pratyush Anand, Mohit KUMAR
> > >   - TI OMAP PCIe: Kishon Vijay Abraham I
> >
> > I'm in the process of rebasing the patches on top of next 2013-10-10. Right
> > now I'm getting a crash in __write_msi_msg() when my Intel "igb" reports
> > "enabling bus mastering" . Any quick idea? Seems like this MSI support is
> > new in the pcie- designware.c .
> >
> > I'll just start plumbing to see what it is.
> 
> Looks like irq_alloc_descs() return -EEXIST for me in assign_irq() . Noone
> checks the return value of it , so it can fail later on ;-) Now, why does it
> return -EEXIST in the first place? I'm sure someone more experienced with PCI
> would know right away .

Hi Marek,

How about applying the following patch, which was made by Pratyush Anand? :-)
I am not sure; however, the patch resolved some problems that were found on
OMAP PCIe and Exynos PCIe, when MSI is enabled.

"PCI: designware: Add irq_create_mapping()"

http://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/commit/?h=pci/host-exynos&id=904d0e7889933fb48d921c998fd1cabb3a9d6635

Best regards,
Jingoo Han