linux-kernel - Re: [PATCH v5 11/12] PCI: designware-ep: Make dw_pcie_ep_reset

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Message-ID: <db3f2460-706e-0d93-2038-5abeef23aa85@ti.com>
Date:   Thu, 29 Mar 2018 15:33:16 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Niklas Cassel <niklas.cassel@...s.com>,
        <cyrille.pitchen@...e-electrons.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     Niklas Cassel <niklass@...s.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 11/12] PCI: designware-ep: Make dw_pcie_ep_reset_bar()
 handle 64-bit BARs properly



On Wednesday 28 March 2018 05:20 PM, Niklas Cassel wrote:
> Since a 64-bit BAR consists of a BAR pair, we need to write to both
> BARs in the BAR pair to clear the BAR properly.
> 
> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>

Acked-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/pci/dwc/pcie-designware-ep.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
> index cc4d8381c1dc..4d304e3ccf24 100644
> --- a/drivers/pci/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/dwc/pcie-designware-ep.c
> @@ -28,6 +28,10 @@ static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar,
>  	dw_pcie_dbi_ro_wr_en(pci);
>  	dw_pcie_writel_dbi2(pci, reg, 0x0);
>  	dw_pcie_writel_dbi(pci, reg, 0x0);
> +	if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) {
> +		dw_pcie_writel_dbi2(pci, reg + 4, 0x0);
> +		dw_pcie_writel_dbi(pci, reg + 4, 0x0);
> +	}
>  	dw_pcie_dbi_ro_wr_dis(pci);
>  }
>  
>