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SubjectRe: [PATCH v5 08/12] PCI: endpoint: Handle 64-bit BARs properly
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On Wednesday 28 March 2018 05:20 PM, Niklas Cassel wrote:
> If a 64-bit BAR was set-up, we need to skip a BAR,
> since a 64-bit BAR consists of a BAR pair.
>
> We need to check what BAR width the epc->ops->set_bar() specific
> implementation actually did set-up, since some drivers, like the
> Cadence EP controller, sometimes sets up a 64-bit BAR, even though
> a 32-bit BAR was requested.
>
> Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>

Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
> drivers/pci/endpoint/functions/pci-epf-test.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 91274779e59f..d46e3ebabb8e 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -380,6 +380,13 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
> if (bar == test_reg_bar)
> return ret;
> }
> + /*
> + * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
> + * if the specific implementation required a 64-bit BAR,
> + * even if we only requested a 32-bit BAR.
> + */
> + if (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
> + bar++;
> }
>
> return 0;
>

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