Re: [PATCH 2/5] PCI: dwc: Add support for retaining link during host init

[Konrad Dybcio]

On 1/9/26 4:53 PM, Bjorn Helgaas wrote:
> On Fri, Jan 09, 2026 at 12:51:07PM +0530, Krishna Chaitanya Chundru wrote:
>> Some platforms keep the PCIe link up across bootloader and kernel
>> handoff. In such cases, reinitializing the root complex is unnecessary
>> if the DWC glue drivers wants to retain the PCIe link.
>>
>> Introduce a link_retain flag in struct dw_pcie_rp to indicate that
>> the link should be preserved. When this flag is set by DWC glue drivers,
>> skip dw_pcie_setup_rc() and only initialize MSI, avoiding redundant
>> configuration steps.
> 
> It sounds like this adds an assumption that the bootloader
> initialization is the same as what dw_pcie_setup_rc() would do.  This
> assumption also applies to future changes in dw_pcie_setup_rc().
> 
> It looks like you mention an issue like this in [PATCH 4/5]; DBI & ATU
> base being different than "HLOS" (whatever that is).  This sounds like

FYI, "HLOS" is a Qualcomm term for "High-Level OS".. which is a very
pedantic way to say "OS"

Konrad