Processor Expert SoftwareのトピックRe: [T2080RDB] How to configure Common clock for PCIe endpoint

[T2080RDB] How to configure Common clock for PCIe endpoint

Venkat_Vellanki — Sat, 03 Aug 2024 16:33:39 GMT

Hi,

We are working on T2080 PCIe . According to QorIQ_T2080_Reference_Manual(PgNo : 1545) we want to change the Common clock configuration(CCC) bit value in Link Control Register.

Can I get more information on how to configure it in U-boot level?

Thanks and Regards,

Venkat Vellanki.

Re: [T2080RDB] How to configure Common clock for PCIe endpoint

yipingwang — Mon, 12 Aug 2024 07:30:42 GMT

Discussing with the AE team.

Re: [T2080RDB] How to configure Common clock for PCIe endpoint

yipingwang — Tue, 13 Aug 2024 07:20:15 GMT

You can change the link control register in drivers/pci/fsl_pci_init.c

for ex as below to change cc to 1:

pci_lcr = pcie_cap_pos + 0x10;
temp32 |= 0x40;
pci_hose_write_config_dword(hose, dev, pci_lcr, temp32);

Re: [T2080RDB] How to configure Common clock for PCIe endpoint

Venkat_Vellanki — Tue, 13 Aug 2024 09:46:09 GMT

Hi yipingwang ,

Thanks for the response

We have already changed as mentioned above but still couldn't configure to common clock.

We configured in the following path /drivers/pci/fsl_pci_init.c

void fsl_pci_init(struct pci_controller *hose, struct fsl_pci_info *pci_info)
{
#code
if (retrain_link_g)
{
pci_lcr = pcie_cap_pos + 0x10;
temp32 = 0;
pci_hose_read_config_dword(hose, dev, pci_lcr, &temp32);
printf("pci_lcr: 0x%x\n", temp32);
temp32 |= 0x40;
printf("pci_lcr mk: 0x%x\n", temp32);
pci_hose_write_config_dword(hose, dev, pci_lcr, temp32);
udelay(100000);
}
}

Are there any other modifications that are required.?

Re: [T2080RDB] How to configure Common clock for PCIe endpoint

Venkat_Vellanki — Mon, 14 Oct 2024 09:16:02 GMT

Hi @yipingwang

Please let us know any update on this as soon as possible .

Thanks,

Venkat Velanki.

Re: [T2080RDB] How to configure Common clock for PCIe endpoint

yipingwang — Mon, 14 Oct 2024 09:33:53 GMT

Please refer to the following update from the AE team.

No further information from software team since it is an old part with old SDK.
customer may search the source code and find a better way on their own.