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charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Manivannan On Thu, 13 Nov 2025 at 10:01, Manivannan Sadhasivam wrote= : > > On Mon, Nov 10, 2025 at 01:41:45PM +0100, Lukas Wunner wrote: > > On Mon, Nov 10, 2025 at 04:59:47PM +0530, Krishna Chaitanya Chundru wro= te: > > > From PCIe r6, sec 5.5.4 & Table 5-11 in sec 5.5.5 T_POWER_ON is the > > > > Please use the latest spec version as reference, i.e. PCIe r7.0. > > > > > minimum amount of time(in us) that each component must wait in L1.2.E= xit > > > after sampling CLKREQ# asserted before actively driving the interface= to > > > ensure no device is ever actively driving into an unpowered component= and > > > these values are based on the components and AC coupling capacitors u= sed > > > in the connection linking the two components. > > > > > > This property should be used to indicate the T_POWER_ON for each Root= Port. > > > > What's the difference between this property and the Port T_POWER_ON_Sca= le > > and T_POWER_ON_Value in the L1 PM Substates Capabilities Register? > > > > Why do you need this in the device tree even though it's available > > in the register? > > > > Someone needs to program these registers. In the x86 world, BIOS will do = it > happily, but in devicetree world, OS has to do it. And since this is a pl= atform > specific value, this is getting passed from devicetree. > According to the RK3588 TRM Part 2, the DSP_PCIE_L1SUB_CAPABILITY_REG (0x4) It is a commonly configurable parameter, It can be tuned on for the Rockchip platform. > - Mani > > -- > =E0=AE=AE=E0=AE=A3=E0=AE=BF=E0=AE=B5=E0=AE=A3=E0=AF=8D=E0=AE=A3=E0=AE=A9= =E0=AF=8D =E0=AE=9A=E0=AE=A4=E0=AE=BE=E0=AE=9A=E0=AE=BF=E0=AE=B5=E0=AE=AE= =E0=AF=8D > Thanks -Anand I could not apply this patch $ git am ./v2_20251110_krishna_chundru_schemas_pci_document_pcie_t_power_on= .mbx Applying: schemas: pci: Document PCIe T_POWER_ON error: dtschema/schemas/pci/pci-bus-common.yaml: does not exist in index Patch failed at 0001 schemas: pci: Document PCIe T_POWER_ON hint: Use 'git am --show-current-patch=3Ddiff' to see the failed patch hint: When you have resolved this problem, run "git am --continue". hint: If you prefer to skip this patch, run "git am --skip" instead. hint: To restore the original branch and stop patching, run "git am --abort= ". hint: Disable this message with "git config set advice.mergeConflict false"