linux-kernel - Re: [PATCH v2] stmmac: CSR clock configuration fix

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Message-ID: <15975894-6a5e-1706-ff9e-660c0bac3971@electromag.com.au>
Date:   Thu, 22 Dec 2016 23:42:01 +0800
From:   Phil Reid <preid@...ctromag.com.au>
To:     Joao Pinto <Joao.Pinto@...opsys.com>, peppe.cavallaro@...com,
        davem@...emloft.net, seraphin.bonnaffe@...com
Cc:     hock.leong.kweh@...el.com, niklas.cassel@...s.com, pavel@....cz,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] stmmac: CSR clock configuration fix

G'day Joao,

On 22/12/2016 20:38, Joao Pinto wrote:
> When testing stmmac with my QoS reference design I checked a problem in the
> CSR clock configuration that was impossibilitating the phy discovery, since
> every read operation returned 0x0000ffff. This patch fixes the issue.
>
> Signed-off-by: Joao Pinto <jpinto@...opsys.com>
> ---
> changes v1->v2 (David Miller)
> - DWMAC100 and DWMAC1000 csr clocks masks should also be fixed for the patch
> to make sense
>
>  drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c | 2 +-
>  drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c  | 2 +-
>  drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c    | 8 ++++----
>  3 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
> index b21d03f..94223c8 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
> @@ -539,7 +539,7 @@ struct mac_device_info *dwmac1000_setup(void __iomem *ioaddr, int mcbins,
>  	mac->mii.reg_shift = 6;
>  	mac->mii.reg_mask = 0x000007C0;
>  	mac->mii.clk_csr_shift = 2;
> -	mac->mii.clk_csr_mask = 0xF;
> +	mac->mii.clk_csr_mask = GENMASK(4, 2);

Should this not be GENMASK(5,2)

>
>  	/* Get and dump the chip ID */
>  	*synopsys_id = stmmac_get_synopsys_id(hwid);
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c
> index a1d582f..8a40e69 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c
> @@ -197,7 +197,7 @@ struct mac_device_info *dwmac100_setup(void __iomem *ioaddr, int *synopsys_id)
>  	mac->mii.reg_shift = 6;
>  	mac->mii.reg_mask = 0x000007C0;
>  	mac->mii.clk_csr_shift = 2;
> -	mac->mii.clk_csr_mask = 0xF;
> +	mac->mii.clk_csr_mask = GENMASK(4, 2);
same as above?

>
>  	/* Synopsys Id is not available on old chips */
>  	*synopsys_id = 0;
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> index 23322fd..fda01f7 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> @@ -81,8 +81,8 @@ static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
>  	value |= (phyaddr << priv->hw->mii.addr_shift)
>  		& priv->hw->mii.addr_mask;
>  	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
> -	value |= (priv->clk_csr & priv->hw->mii.clk_csr_mask)
> -		<< priv->hw->mii.clk_csr_shift;
> +	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
> +		& priv->hw->mii.clk_csr_mask;
>  	if (priv->plat->has_gmac4)
>  		value |= MII_GMAC4_READ;
>
> @@ -122,8 +122,8 @@ static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
>  		& priv->hw->mii.addr_mask;
>  	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
>
> -	value |= ((priv->clk_csr & priv->hw->mii.clk_csr_mask)
> -		<< priv->hw->mii.clk_csr_shift);
> +	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
> +		& priv->hw->mii.clk_csr_mask;
>  	if (priv->plat->has_gmac4)
>  		value |= MII_GMAC4_WRITE;
>
>


-- 
Regards
Phil Reid