Dear Jingoo Han, > On Wednesday, November 27, 2013 5:37 PM, Pratyush Anand wrote: > > On Wed, Nov 27, 2013 at 04:24:47PM +0800, Marek Vasut wrote: > > > > On Wed, Nov 27, 2013 at 04:46:09AM +0800, Marek Vasut wrote: > > > > > Dear Pratyush Anand, > > > > > > > > > > > Hi, > > > > > > > > > > > > On Wed, Oct 23, 2013 at 12:55:43PM +0800, Tim Harvey wrote: > > > > > > > The IMX6 iATU is used for address translation between the AXI > > > > > > > bus address space and PCI address space. This is used for > > > > > > > type0 and type1 config cycles but is not necessary for > > > > > > > outbound io/mem regions. > > > > > > > > > > > > > > This patch removes the calls that inappropriately re-configures > > > > > > > the ATU viewport for outbound memory and IO after config > > > > > > > cycles and removes them altogether as they are not necessary. > > > > > > > > > > > > > > This resolves issues with PCI devices behind switches and has > > > > > > > been tested with a Gige device behind a PLX PEX860x switch. > > > > > > > More testing is needed for other configurations. > > > > > > > > > > > > It seems to me that in your controller you have only one view > > > > > > port. Also mem_base and mem_bus_addr is same. Thats why it works > > > > > > in your case. > > > > > > > > > > MX6 has 4 In/4 Out viewports AFAICT. > > > > > > > > Then if I do not miss anything, MX6 should work even without this > > > > patch. > > > > > > Yes, yet, it does not. On the other hand, this defect is only > > > problematic if you use the devices behind a switch. Do you use a PCIe > > > switch on your platform please? > > > > I had tested with device under bridge. > > Mohit is in process of validating SPEAr patches with latest kernel. > > Mohit, see if we can arrange a switch and test, once SPEAr platform is > > ready with latest kernel. > > I agree with Pratyush Anand's opinion. > One of our engineers had tested PCI cards under switch. > As far as I know, there was no issue about this. > However, currently, I don't have any switches. So, I > Cannot test this on Exynos platform. OK, I will wait for Richard to come up with confirmation if possible. Looks like he's out of the office, so it might take a bit. > Mohit, > If you test a switch on SPEAr platform, it will be > very helpful. Thank you. > > Best regards, > Jingoo Han Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
