Hello,
> The commit message in commit fc9a77040b04 ("PCI: designware-ep: Configure
> Resizable BAR cap to advertise the smallest size") claims that it modifies
> the Resizable BAR capability to only advertise support for 1 MB size BARs.
>
> However, the commit writes all zeroes to PCI_REBAR_CAP (the register which
> contains the possible BAR sizes that a BAR be resized to).
>
> According to the spec, it is illegal to not have a bit set in
> PCI_REBAR_CAP, and 1 MB is the smallest size allowed.
>
> Set bit 4 in PCI_REBAR_CAP, so that we actually advertise support for a
> 1 MB BAR size.
>
> Before:
> Capabilities: [2e8 v1] Physical Resizable BAR
> BAR 0: current size: 1MB
> BAR 1: current size: 1MB
> BAR 2: current size: 1MB
> BAR 3: current size: 1MB
> BAR 4: current size: 1MB
> BAR 5: current size: 1MB
> After:
> Capabilities: [2e8 v1] Physical Resizable BAR
> BAR 0: current size: 1MB, supported: 1MB
> BAR 1: current size: 1MB, supported: 1MB
> BAR 2: current size: 1MB, supported: 1MB
> BAR 3: current size: 1MB, supported: 1MB
> BAR 4: current size: 1MB, supported: 1MB
> BAR 5: current size: 1MB, supported: 1MB
Applied to controller/dwc, thank you!
[1/1] PCI: dwc: endpoint: Fix advertised resizable BAR size
https://git.kernel.org/pci/pci/c/72e34b8593e0
Krzysztof
