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Date: Tue, 15 Dec 2020 21:50:35 +0100
From: Mian Yousaf Kaukab <ykaukab@...e.de>
To: Rob Herring <robh@...nel.org>
Cc: Vidya Sagar <vidyas@...dia.com>, lorenzo.pieralisi@....com,
bhelgaas@...gle.com, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: dwc: tegra194: issue with card containing a bridge
On Tue, Dec 15, 2020 at 01:44:21PM -0600, Rob Herring wrote:
> On Tue, Dec 15, 2020 at 09:41:47AM -0600, Rob Herring wrote:
> > On Tue, Dec 15, 2020 at 02:25:04PM +0100, Mian Yousaf Kaukab wrote:
> > > 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.
> >
> > I think the 2nd time is making the link go down is my guess. Tegra was
> > odd in that its start/stop link functions don't do link handling, so I
> > didn't implement those functions and left the link handling in the Tegra
> > driver.
> >
> > Can you try the below patch. It needs some more work as it breaks
> > endpoint mode.
>
> That one missed some re-init. Try this one instead
>
> 8<--------------------------------------------------------------------
>
> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
> index 5597b2a49598..d8fed3561e91 100644
> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> @@ -933,14 +933,24 @@ static void tegra_pcie_prepare_host(struct pcie_port *pp)
>
> static int tegra_pcie_dw_host_init(struct pcie_port *pp)
> {
> - struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> - struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
> - u32 val, tmp, offset, speed;
> -
> pp->bridge->ops = &tegra_pci_ops;
>
> tegra_pcie_prepare_host(pp);
>
> + return 0;
> +}
> +
> +static int tegra_pcie_dw_start_link(struct dw_pcie *pci)
> +{
> + u32 val, offset, speed, tmp;
> + struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
> + struct pcie_port *pp = &pci->pp;
> +
> + if (pcie->mode == DW_PCIE_EP_TYPE) {
> + enable_irq(pcie->pex_rst_irq);
> + return 0;
> + }
> +
> if (dw_pcie_wait_for_link(pci)) {
> /*
> * There are some endpoints which can't get the link up if
> @@ -998,15 +1008,6 @@ static int tegra_pcie_dw_link_up(struct dw_pcie *pci)
> return !!(val & PCI_EXP_LNKSTA_DLLLA);
> }
>
> -static int tegra_pcie_dw_start_link(struct dw_pcie *pci)
> -{
> - struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
> -
> - enable_irq(pcie->pex_rst_irq);
> -
> - return 0;
> -}
> -
> static void tegra_pcie_dw_stop_link(struct dw_pcie *pci)
> {
> struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
With USB3380 card PTM enabled... is the last message I see. It doesn't
boot further:
[ 9.124500] tegra194-pcie 141a0000.pcie: iATU unroll: enabled
[ 9.130310] tegra194-pcie 141a0000.pcie: Detected iATU regions: 8 outbound, 2 inbound
[ 9.138915] tegra194-pcie 141a0000.pcie: Link up
[ 9.144940] tegra194-pcie 141a0000.pcie: PCI host bridge to bus 0005:00
[ 9.151849] pci_bus 0005:00: root bus resource [bus 00-ff]
[ 9.157595] pci_bus 0005:00: root bus resource [mem 0x1c00000000-0x1f3fffffff pref]
[ 9.165509] pci_bus 0005:00: root bus resource [mem 0x1f40000000-0x1ffffeffff] (bus address [0x40000000-0xfffeffff])
[ 9.176444] pci_bus 0005:00: root bus resource [io 0x30000-0x3ffff] (bus address [0x0000-0xffff])
[ 9.186189] pci 0005:00:00.0: [10de:1ad0] type 01 class 0x060400
[ 9.193638] pci 0005:00:00.0: PME# supported from D0 D3hot D3cold
[ 9.200626] pci 0005:00:00.0: PTM enabled (root), 16ns granularity
With a Nvidia GT530 It boots to the prompt:
[ 9.133576] tegra194-pcie 141a0000.pcie: iATU unroll: enabled
[ 9.139371] tegra194-pcie 141a0000.pcie: Detected iATU regions: 8 outbound, 2 inbound
[ 10.152565] tegra194-pcie 141a0000.pcie: Phy link never came up
[ 11.164571] tegra194-pcie 141a0000.pcie: Phy link never came up
[ 11.172598] tegra194-pcie 141a0000.pcie: PCI host bridge to bus 0005:00
[ 11.179999] pci_bus 0005:00: root bus resource [bus 00-ff]
[ 11.185998] pci_bus 0005:00: root bus resource [mem 0x1c00000000-0x1f3fffffff pref]
[ 11.194120] pci_bus 0005:00: root bus resource [mem 0x1f40000000-0x1ffffeffff] (bus address [0x40000000-0xfffeffff])
[ 11.205339] pci_bus 0005:00: root bus resource [io 0x30000-0x3ffff] (bus address [0x0000-0xffff])
[ 11.215464] pci 0005:00:00.0: [10de:1ad0] type 01 class 0x060400
[ 11.224039] pci 0005:00:00.0: PME# supported from D0 D3hot D3cold
[ 11.231086] pci 0005:00:00.0: PTM enabled (root), 16ns granularity
[ 11.268132] pci 0005:00:00.0: PCI bridge to [bus 01-ff]
[ 11.275849] pcieport 0005:00:00.0: PME: Signaling with IRQ 54
[ 11.284553] pcieport 0005:00:00.0: AER: enabled with IRQ 54
[ 11.291322] pcieport 0005:00:00.0: bw_notification: enabled with IRQ 54
[ 11.299108] pci_bus 0005:01: busn_res: [bus 01-ff] is released
[ 11.305119] pci_bus 0005:00: busn_res: [bus 00-ff] is released
...
However, lspci doesn't list GT530. Before the patch GT530 was working
properly.
BR,
Yousaf
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