Re: [PATCH v2 2/2] PCI: keystone: update to support multiple pci ports
From: Murali Karicheri
Date: Tue Sep 09 2014 - 17:49:39 EST
On 09/09/2014 05:09 PM, Arnd Bergmann wrote:
On Tuesday 09 September 2014 16:42:46 Murali Karicheri wrote:
/* update the Vendor ID */
- vendor_device_id = readl(ks_pcie->va_reg_pciid);
- writew((vendor_device_id>> 16), pp->dbi_base + PCI_DEVICE_ID);
+ writew(ks_pcie->device_id, pp->dbi_base + PCI_DEVICE_ID);
/* update the DEV_STAT_CTRL to publish right mrrs */
val = readl(pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);
This change must have slipped in accidentally, at least it's not
described in the changelog. Should this be another patch?
The change seems useful.
Are you referring to mrrs or update to device id? device id is in a SoC
register at index2 and is read and updated by the driver here. MRRS
update was originally in the code.
I meant the device id change. Maybe you accidentally did 'git commit
--amend' during a rebase and that replaced the real changelog with
the one of the patch in front of it and merged the two patches?
Actually this is an inteded. The vendor ID is in a register indicated by
reg offset and as per the device spec, it needs to be read and updated
by the software. Now since multiple instances of PCI device needs to be
read the same register, the reading happens in the probe() and same is
unmapped after that.
+ ks_pcie->device_id = readl(reg_p) >> 16;
+ devm_iounmap(dev, reg_p);
+ devm_release_mem_region(dev, res->start, resource_size(res));
Afetr that in ks_pcie_host_init(), it update the device_id in the RC's
config space.
Thanks
Murali
That happened to me a few times and would explain the strange mix
of two changes.
Arnd
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