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The current > TPH implementation incorrectly attempts to find and check a Root Port's > TPH completer capability for these devices. > > Add a check to skip Root Port completer type verification for RC_END > devices, allowing them to use their full TPH requester capability > without being limited by a non-existent Root Port's completer support. > > For RC_END devices, the root complex itself acts as the TPH completer, > and this relationship is handled differently than the standard > endpoint-to-Root-Port model. > > Fixes: f69767a1ada3 ("PCI: Add TLP Processing Hints (TPH) support") > Signed-off-by: George Abraham P > --- > v1->v2: > - Added "Fixes:" tag to link the commit hash that introduced the code > > drivers/pci/tph.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/pci/tph.c b/drivers/pci/tph.c > index cc64f93709a4..c61456d24f61 100644 > --- a/drivers/pci/tph.c > +++ b/drivers/pci/tph.c > @@ -397,10 +397,13 @@ int pcie_enable_tph(struct pci_dev *pdev, int mode) > else > pdev->tph_req_type = PCI_TPH_REQ_TPH_ONLY; > > - rp_req_type = get_rp_completer_type(pdev); > + /* Check if the device is behind a Root Port */ > + if (pci_pcie_type(pdev) != PCI_EXP_TYPE_RC_END) { > + rp_req_type = get_rp_completer_type(pdev); > > - /* Final req_type is the smallest value of two */ > - pdev->tph_req_type = min(pdev->tph_req_type, rp_req_type); > + /* Final req_type is the smallest value of two */ > + pdev->tph_req_type = min(pdev->tph_req_type, rp_req_type); > + } > > if (pdev->tph_req_type == PCI_TPH_REQ_DISABLE) > return -EINVAL; > > base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787 Kindly let me know if there is anything i can do to take this patch forward. Thanks, George