linux-kernel - Re: [PATCH v4 08/11] PCI: layerscape: Modify the MSIX to the doorbell mode

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Date:   Fri, 28 Feb 2020 17:10:32 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Xiaowei Bao <xiaowei.bao@....com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <shawnguo@...nel.org>,
        <leoyang.li@....com>, <lorenzo.pieralisi@....com>,
        <minghuan.Lian@....com>, <mingkai.hu@....com>, <roy.zang@....com>,
        <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <andrew.murray@....com>, <linux-pci@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v4 08/11] PCI: layerscape: Modify the MSIX to the doorbell
 mode

Hi Xiaowei,

On 24/09/19 7:48 am, Xiaowei Bao wrote:
> dw_pcie_ep_raise_msix_irq was never called in the exisitng driver
> before, because the ls1046a platform don't support the MSIX feature
> and msix_capable was always set to false.
> Now that add the ls1088a platform with MSIX support, but the existing
> dw_pcie_ep_raise_msix_irq doesn't work, so use the doorbell method to
> support the MSIX feature.


It does work after [1]. So the commit message might not be exactly true.

[1] -> https://lore.kernel.org/r/20200225081703.8857-1-kishon@ti.com

Thanks
Kishon

> 
> Signed-off-by: Xiaowei Bao <xiaowei.bao@....com>
> Reviewed-by: Andrew Murray <andrew.murray@....com>
> ---
> v2: 
>  - No change
> v3:
>  - Modify the commit message make it clearly.
> v4: 
>  - No change
> 
>  drivers/pci/controller/dwc/pci-layerscape-ep.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> index 1e07287..5f0cb99 100644
> --- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> @@ -79,7 +79,8 @@ static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
>  	case PCI_EPC_IRQ_MSI:
>  		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
>  	case PCI_EPC_IRQ_MSIX:
> -		return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
> +		return dw_pcie_ep_raise_msix_irq_doorbell(ep, func_no,
> +							  interrupt_num);
>  	default:
>  		dev_err(pci->dev, "UNKNOWN IRQ type\n");
>  		return -EINVAL;
>