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SubjectRe: dwc: tegra194: issue with card containing a bridge
On Tue, Dec 15, 2020 at 05:45:59PM +0530, Vidya Sagar wrote:
> Thanks Mian for bringing it to our notice.
> Have you tried removing the dw_pcie_setup_rc(pp); call from pcie-tegra194.c
> file on top of linux-next? and does that solve the issue?
>
> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c
> b/drivers/pci/controller/dwc/pcie-tegra194.c
> index 5597b2a49598..1c9e9c054592 100644
> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> @@ -907,7 +907,7 @@ static void tegra_pcie_prepare_host(struct pcie_port
> *pp)
> dw_pcie_writel_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF,
> val);
> }
>
> - dw_pcie_setup_rc(pp);
> + //dw_pcie_setup_rc(pp);
I still see the same issue with this change.
Reverting b9ac0f9dc8ea works though.
>
> clk_set_rate(pcie->core_clk, GEN4_CORE_CLK_FREQ);
>
> I took a quick look at the dw_pcie_setup_rc() implementation and I'm not
> sure why calling it second time should create any issue for the enumeration
> of devices behind a switch. Perhaps I need to spend more time to debug that
> part.
> In any case, since dw_pcie_setup_rc() is already part of
> dw_pcie_host_init(), I think it can be removed from
> tegra_pcie_prepare_host() implemention.
>
> Thanks,
> Vidya Sagar
>
BR,
Yousaf

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