linux-kernel - Re: [PATCH RESEND] PCI: dwc: Fix MSI not work after resume

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Date:   Thu, 18 Mar 2021 13:23:01 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] PCI: dwc: Fix MSI not work after resume

On Mon, Mar 01, 2021 at 11:10:31AM +0800, Jisheng Zhang wrote:
> After we move dw_pcie_msi_init() into core -- dw_pcie_host_init(), the
> MSI stops working after resume. Because dw_pcie_host_init() is only
> called once during probe. To fix this issue, we move dw_pcie_msi_init()
> to dw_pcie_setup_rc().
> 
> Fixes: 59fbab1ae40e ("PCI: dwc: Move dw_pcie_msi_init() into core")
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>

Oops, sorry, looks like this fell through the cracks.  Since
59fbab1ae40e appeared in v5.11, I think we should add:

  Cc: stable@...r.kernel.org	# v5.11+

I'm sure Lorenzo will add it when applying, so no need to repost just
for that.

> ---
> Since v1:
>  - collect Reviewed-by tag
> 
>  drivers/pci/controller/dwc/pcie-designware-host.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 7e55b2b66182..e6c274f4485c 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -400,7 +400,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  	}
>  
>  	dw_pcie_setup_rc(pp);
> -	dw_pcie_msi_init(pp);
>  
>  	if (!dw_pcie_link_up(pci) && pci->ops && pci->ops->start_link) {
>  		ret = pci->ops->start_link(pci);
> @@ -551,6 +550,8 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
>  		}
>  	}
>  
> +	dw_pcie_msi_init(pp);
> +
>  	/* Setup RC BARs */
>  	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
>  	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
> -- 
> 2.30.1
>