linux-kernel - Re: [PATCH v3 08/11] PCI: imx6: Simplify pcie_phy_poll

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Message-ID: <1555085573.11529.36.camel@pengutronix.de>
Date:   Fri, 12 Apr 2019 18:12:53 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        linux-pci@...r.kernel.org
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Fabio Estevam <fabio.estevam@....com>,
        Chris Healy <cphealy@...il.com>,
        Leonard Crestez <leonard.crestez@....com>,
        "A.s. Dong" <aisheng.dong@....com>,
        Richard Zhu <hongxing.zhu@....com>, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/11] PCI: imx6: Simplify pcie_phy_poll_ack()

Am Sonntag, den 31.03.2019, 21:25 -0700 schrieb Andrey Smirnov:
> Simplify pcie_phy_poll_ack() by incorporating shifting into constant
> definition and convert the code to use 'bool'. No functional change
> intended.
> 
> > Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > Cc: Fabio Estevam <fabio.estevam@....com>
> > Cc: Chris Healy <cphealy@...il.com>
> > Cc: Lucas Stach <l.stach@...gutronix.de>
> > Cc: Leonard Crestez <leonard.crestez@....com>
> > Cc: "A.s. Dong" <aisheng.dong@....com>
> > Cc: Richard Zhu <hongxing.zhu@....com>
> Cc: linux-imx@....com
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-pci@...r.kernel.org
> > Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index a49e5e491e12..7c3ffb751002 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -112,7 +112,7 @@ struct imx6_pcie {
> >  #define PCIE_PHY_CTRL_RD		BIT(19)
>  
>  #define PCIE_PHY_STAT (PL_OFFSET + 0x110)
> -#define PCIE_PHY_STAT_ACK_LOC 16
> > +#define PCIE_PHY_STAT_ACK		BIT(16)
>  
> >  #define PCIE_LINK_WIDTH_SPEED_CONTROL	0x80C
>  
> @@ -151,16 +151,16 @@ struct imx6_pcie {
> >  #define PHY_RX_OVRD_IN_LO_RX_DATA_EN		BIT(5)
> >  #define PHY_RX_OVRD_IN_LO_RX_PLL_EN		BIT(3)
>  
> -static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, int exp_val)
> +static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, bool exp_val)

This looks like only going half the way to me. The parameter type is
changed to bool, but the callers still use 0 and 1 directly. If we use
bool here the callers should be changed to true/false.

>  {
>  	struct dw_pcie *pci = imx6_pcie->pci;
> -	u32 val;
> +	bool val;
>  	u32 max_iterations = 10;
>  	u32 wait_counter = 0;
>  
>  	do {
> -		val = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT);
> -		val = (val >> PCIE_PHY_STAT_ACK_LOC) & 0x1;
> +		val = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT) &
> +			PCIE_PHY_STAT_ACK;

I think this needs to be
val = !!(dw_pcie_readl_dbi(pci, PCIE_PHY_STAT) & PCIE_PHY_STAT_ACK);
as the ACK bit isn't shifted down into bit position 0 anymore.

>  		wait_counter++;
>  
> >  		if (val == exp_val)