Re: [PATCH V2 RESEND] PCI/TPH: Skip Root Port completer check for RC_END devices

[Leon Romanovsky <leon@kernel.org>]

On Wed, Feb 18, 2026 at 10:24:28AM +0530, George Abraham P wrote:
> [+cc TPH authors that were missed in the previous mail]
> 
> On 09-Jan-26 10:59 AM, George Abraham P wrote:
> > Root Complex Integrated Endpoint devices (PCI_EXP_TYPE_RC_END) are
> > directly integrated into the root complex and do not have an
> > associated Root Port in the traditional PCIe hierarchy. 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 <george.abraham.p@intel.com>
> > ---
> > v1->v2:
> >   - Added "Fixes:" tag to link the commit hash that introduced the code

I do not have a strong preference; I am fine with adding a Fixes tag or
leaving it out. Up to commit 2961f841b025, pcie_enable_tph() is called
in two drivers: bnxt and mlx5. Which of these devices is the RC_END
device?

Thanks