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crypto: ccp/tsm - Enable the root port after the endpoint

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The PCIe r7.0, chapter "6.33.8 Other IDE Rules" mandates if selective IDE
is enabled for config requersts, a stream must be enabled on the endpoint
before enabling it on the rootport:

===
For Selective IDE, the Stream must not be used until it has been enabled in
both Partner Ports. For cases where one of the Partner Ports is a Root Port
and Selective IDE for Configuration Requests is enabled, the other
Partner Port must be enabled prior to the Root Port. For other scenarios,
the mechanisms to satisfy this requirement are implementation-specific.
===

Do what the spec says.

Fixes: 4be423572d ("crypto/ccp: Implement SEV-TIO PCIe IDE (phase1)")
Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Alexey Kardashevskiy 2026-05-21 17:43:01 +10:00 committed by Herbert Xu
parent 90fe909ed6
commit 50e506201b
1 changed files with 5 additions and 5 deletions
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10
drivers/crypto/ccp/sev-dev-tsm.c
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@ -58,13 +58,13 @@ static int stream_enable(struct pci_ide *ide)
struct pci_dev *rp = pcie_find_root_port(ide->pdev);
int ret;
ret = pci_ide_stream_enable(rp, ide);
if (ret)
ret = pci_ide_stream_enable(ide->pdev, ide);
if (ret && ret != -ENXIO)
return ret;
ret = pci_ide_stream_enable(ide->pdev, ide);
if (ret)
pci_ide_stream_disable(rp, ide);
ret = pci_ide_stream_enable(rp, ide);
if (ret && ret != -ENXIO)
pci_ide_stream_disable(ide->pdev, ide);
return ret;
}