linux-kernel - Re: [PATCH] PCI: brcmstb: Assert fundamental reset on initialization

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Date:   Sat, 9 May 2020 18:13:33 -0400
From:   Jim Quinlan <james.quinlan@...adcom.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        s.nawrocki@...sung.com, tim.gover@...pberrypi.com,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" 
        <linux-pci@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: brcmstb: Assert fundamental reset on initialization

On Thu, May 7, 2020 at 1:20 PM Nicolas Saenz Julienne
<nsaenzjulienne@...e.de> wrote:
>
> While preparing the driver for upstream this detail was missed.
>
> If not asserted during the initialization process, devices connected on
> the bus will not be made aware of the internal reset happening. This,
> potentially resulting in unexpected behavior.
Hi Nicolas,
I believe that most chips by design have the PERST signal asserted by
default during start-up but this will certainly cover any that do not.
Looks good.
Regards,
Jim
>
> Fixes: c0452137034b ("PCI: brcmstb: Add Broadcom STB PCIe host controller driver")
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> ---
>  drivers/pci/controller/pcie-brcmstb.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index 0b97b94c4a9a..795a03be4150 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -699,6 +699,7 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
>
>         /* Reset the bridge */
>         brcm_pcie_bridge_sw_init_set(pcie, 1);
> +       brcm_pcie_perst_set(pcie, 1);
>
>         usleep_range(100, 200);
>
> --
> 2.26.2
>