linux-kernel - RE: [PATCH 10/23] PCI: mobiveil: fix the INTx process error

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Message-ID: <AM6PR04MB5781A186E0F6D9C0E7BABAF384DC0@AM6PR04MB5781.eurprd04.prod.outlook.com>
Date:   Thu, 15 Nov 2018 02:59:48 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "l.subrahmanya@...iveil.co.in" <l.subrahmanya@...iveil.co.in>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>
CC:     Mingkai Hu <mingkai.hu@....com>,
        "M.h. Lian" <minghuan.lian@....com>,
        Xiaowei Bao <xiaowei.bao@....com>
Subject: RE: [PATCH 10/23] PCI: mobiveil: fix the INTx process error

Hi Subrahmanya,

As NXP does not integrate Mobiveil's INTx and MSI interrupt controller, I am unable to test this fix.
Can you help to test this fix?

Thanks,
Zhiqiang
> -----Original Message-----
> From: Z.q. Hou
> Sent: 2018年11月6日 21:20
> To: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> bhelgaas@...gle.com; robh+dt@...nel.org; mark.rutland@....com;
> l.subrahmanya@...iveil.co.in; shawnguo@...nel.org; Leo Li
> <leoyang.li@....com>; lorenzo.pieralisi@....com
> Cc: Mingkai Hu <mingkai.hu@....com>; M.h. Lian
> <minghuan.lian@....com>; Xiaowei Bao <xiaowei.bao@....com>; Z.q. Hou
> <zhiqiang.hou@....com>
> Subject: [PATCH 10/23] PCI: mobiveil: fix the INTx process error
> 
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> In the loop block, there is not code change the loop key, this patch updated
> the loop key by re-read the INTx status register.
> 
> This patch also change to clear the handled INTx status.
> 
> Note: Need MV to test this change.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> ---
>  drivers/pci/controller/pcie-mobiveil.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mobiveil.c
> b/drivers/pci/controller/pcie-mobiveil.c
> index d03392940944..884c9f95374d 100644
> --- a/drivers/pci/controller/pcie-mobiveil.c
> +++ b/drivers/pci/controller/pcie-mobiveil.c
> @@ -361,6 +361,7 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
>  	/* Handle INTx */
>  	if (intr_status & PAB_INTP_INTX_MASK) {
>  		shifted_status = csr_readl(pcie, PAB_INTP_AMBA_MISC_STAT);
> +		shifted_status &= PAB_INTP_INTX_MASK;
>  		shifted_status >>= PAB_INTX_START;
>  		do {
>  			for_each_set_bit(bit, &shifted_status, PCI_NUM_INTX) { @@
> -372,12 +373,16 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
>  					dev_err_ratelimited(dev, "unexpected IRQ,
> INT%d\n",
>  							    bit);
> 
> -				/* clear interrupt */
> -				csr_writel(pcie,
> -					   shifted_status << PAB_INTX_START,
> +				/* clear interrupt handled */
> +				csr_writel(pcie, 1 << (PAB_INTX_START + bit),
>  					   PAB_INTP_AMBA_MISC_STAT);
>  			}
> -		} while ((shifted_status >> PAB_INTX_START) != 0);
> +
> +			shifted_status = csr_readl(pcie,
> +						   PAB_INTP_AMBA_MISC_STAT);
> +			shifted_status &= PAB_INTP_INTX_MASK;
> +			shifted_status >>= PAB_INTX_START;
> +		} while (shifted_status != 0);
>  	}
> 
>  	/* read extra MSI status register */
> --
> 2.17.1