linux-kernel - Re: [PATCH 09/12] PCI: dwc: Convert Link-up status method to using dw_pcie_readl

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Message-ID: <20220324122034.GI2854@thinkpad>
Date:   Thu, 24 Mar 2022 17:50:34 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Frank Li <Frank.Li@....com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/12] PCI: dwc: Convert Link-up status method to using
 dw_pcie_readl_dbi()

On Thu, Mar 24, 2022 at 04:25:20AM +0300, Serge Semin wrote:
> While the rest of the generic DWC PCIe code is using the dedicated IO-mem
> accessors, the dw_pcie_link_up() method for some unobvious reason directly
> calls readl() to get PortLogic.DEBUG1 register content. Since the way the
> dbi-bus is accessed can be platform-specific let's replace the direct dbi
> memory space read procedure with the readl-wrapper invocation. Thus we'll
> have a slightly more generic dw_pcie_link_up() method.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> ---
>  drivers/pci/controller/dwc/pcie-designware.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index e3d2c11e6998..6e81264fdfb4 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -548,7 +548,7 @@ int dw_pcie_link_up(struct dw_pcie *pci)
>  	if (pci->ops && pci->ops->link_up)
>  		return pci->ops->link_up(pci);
>  
> -	val = readl(pci->dbi_base + PCIE_PORT_DEBUG1);
> +	val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1);
>  	return ((val & PCIE_PORT_DEBUG1_LINK_UP) &&
>  		(!(val & PCIE_PORT_DEBUG1_LINK_IN_TRAINING)));
>  }
> -- 
> 2.35.1
>