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SubjectRe: [PATCH 08/13] PCI: cadence: Use local management register to configure Vendor ID
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+Tom

Hi,

On 17/12/19 6:12 pm, Andrew Murray wrote:
> On Mon, Dec 09, 2019 at 02:51:42PM +0530, Kishon Vijay Abraham I wrote:
>> PCI_VENDOR_ID in root port configuration space is read-only register
>> and writing to it will have no effect. Use local management register to
>> configure Vendor ID and Subsystem Vendor ID.
>
> Is this a bug fix? Can you add a Fixes tag and make that clearer?

I think this might have worked in Cadence platform? Tom?

Thanks
Kishon

>
> Thanks,
>
> Andrew Murray
>
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
>> ---
>> drivers/pci/controller/cadence/pcie-cadence-host.c | 9 +++++++--
>> 1 file changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
>> index cf817be237af..afb2c96a6538 100644
>> --- a/drivers/pci/controller/cadence/pcie-cadence-host.c
>> +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
>> @@ -71,6 +71,7 @@ static int cdns_pcie_host_init_root_port(struct cdns_pcie_rc *rc)
>> {
>> struct cdns_pcie *pcie = &rc->pcie;
>> u32 value, ctrl;
>> + u32 id;
>>
>> /*
>> * Set the root complex BAR configuration register:
>> @@ -90,8 +91,12 @@ static int cdns_pcie_host_init_root_port(struct cdns_pcie_rc *rc)
>> cdns_pcie_writel(pcie, CDNS_PCIE_LM_RC_BAR_CFG, value);
>>
>> /* Set root port configuration space */
>> - if (rc->vendor_id != 0xffff)
>> - cdns_pcie_rp_writew(pcie, PCI_VENDOR_ID, rc->vendor_id);
>> + if (rc->vendor_id != 0xffff) {
>> + id = CDNS_PCIE_LM_ID_VENDOR(rc->vendor_id) |
>> + CDNS_PCIE_LM_ID_SUBSYS(rc->vendor_id);
>> + cdns_pcie_writel(pcie, CDNS_PCIE_LM_ID, id);
>> + }
>> +
>> if (rc->device_id != 0xffff)
>> cdns_pcie_rp_writew(pcie, PCI_DEVICE_ID, rc->device_id);
>>
>> --
>> 2.17.1
>>

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