linux-kernel - Re: [PATCH] PCI: dwc: Fix integrated MSI Receiver mask reg setting during resume

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Date:   Sun, 23 Jan 2022 20:02:42 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: dwc: Fix integrated MSI Receiver mask reg setting
 during resume

On Sun, Dec 26, 2021 at 03:40:19PM +0800, Jisheng Zhang wrote:
> If the host which makes use of the IP's integrated MSI Receiver losts
> power during suspend, we call dw_pcie_setup_rc() to reinit the RC. But
> dw_pcie_setup_rc() always set the pp->irq_mask[ctrl] as ~0, so the mask
> register is always set as 0xffffffff incorrectly, thus the MSI can't
> work after resume.
> 
> Fix this issue by moving pp->irq_mask[ctrl] initialization to
> dw_pcie_host_init(), so we can correctly set the mask reg during both
> boot and resume.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>

Hi all,

This patch can still be applied to the latest linus tree. Do you want
me to rebase and send out a new version?

Without this patch, dwc host MSI interrupt(if use the IP's integrated
MSI receiver) can't work after resume. Could it be picked up as a fix
for v5.17?

Thanks

> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index f4755f3a03be..2fa86f32d964 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -362,6 +362,12 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  			if (ret < 0)
>  				return ret;
>  		} else if (pp->has_msi_ctrl) {
> +			u32 ctrl, num_ctrls;
> +
> +			num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
> +			for (ctrl = 0; ctrl < num_ctrls; ctrl++)
> +				pp->irq_mask[ctrl] = ~0;
> +
>  			if (!pp->msi_irq) {
>  				pp->msi_irq = platform_get_irq_byname_optional(pdev, "msi");
>  				if (pp->msi_irq < 0) {
> @@ -541,7 +547,6 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
>  
>  		/* Initialize IRQ Status array */
>  		for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
> -			pp->irq_mask[ctrl] = ~0;
>  			dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
>  					    (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
>  					    pp->irq_mask[ctrl]);
> -- 
> 2.34.1
>