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. Mohit, If you test a switch on SPEAr platform, it will be very helpful. Thank you. Best regards, Jingoo Han -- 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
