linux-kernel - Re: [PATCH 06/12] net: stmmac: sun8i: force select external PHY when no internal one

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Date:   Sat, 6 Apr 2019 13:24:26 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     megous@...ous.com, linux-sunxi@...glegroups.com,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Icenowy Zheng <icenowy@...c.io>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Naveen Gupta <naveen.gupta@...ress.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 06/12] net: stmmac: sun8i: force select external PHY when
 no internal one

Hello!

On 06.04.2019 2:45, megous@...ous.com wrote:

> From: Icenowy Zheng <icenowy@...c.io>
> 
> The PHY selection bit also exists on SoCs without an internal PHY; if
> it's set to 1 (internal PHY) then the MAC will not make use of any PHY.
> 
> This problem appears when adapting for H6, which has no real internal
> PHY (the "internal PHY" on H6 is not on-die, but on a co-packaged AC200
> chip, via RMII interface at GPIO bank A), but the PHY selection bit is
> set.
> 
> Force the PHY selection bit to 0 when no external PHY to select this
> problem.

    "Select this problem" sound weird...

> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
>   drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> index e3e3dc44b33b..bd340e77b2ea 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> @@ -908,6 +908,11 @@ static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv)
>   		 * address. No need to mask it again.
>   		 */
>   		reg |= 1 << H3_EPHY_ADDR_SHIFT;
> +	} else {
> +		/* For SoCs without internal PHY the PHY selection bit should be
> +		 * set to 0 (external PHY).
> +		 */
> +		reg &= ~(H3_EPHY_SELECT);
    No () should be needed here, add () around the macro body if still needed.

[...]

MBR, Sergei