linux-kernel - Re: [PATCH v3 3/5] phy: ocelot-serdes: convert to use eth phy mode and submode

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Date:   Tue, 20 Nov 2018 10:18:22 +0100
From:   Quentin Schulz <quentin.schulz@...tlin.com>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        netdev@...r.kernel.org, Sekhar Nori <nsekhar@...com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Tony Lindgren <tony@...mide.com>,
        linux-amlogic@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Carlo Caione <carlo@...one.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Manu Gautam <mgautam@...eaurora.org>
Subject: Re: [PATCH v3 3/5] phy: ocelot-serdes: convert to use eth phy mode
 and submode

Hi Grygorii,

Thanks for the patch!

On Mon, Nov 19, 2018 at 07:24:22PM -0600, Grygorii Strashko wrote:
> Convert ocelot-serdes PHY driver to use recently introduced
> PHY_MODE_ETHERNET and phy_set_mode_ext().
> 
> Cc: Quentin Schulz <quentin.schulz@...tlin.com>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Reviewed-by: Quentin Schulz <quentin.schulz@...tlin.com>
Tested-by: Quentin Schulz <quentin.schulz@...tlin.com>

Tested on top of latest master branch of net-next
(e432abfb99e5642a7e7fcaa1c8cb0e80c8fcf58e) on a PCB120 with VSC8584 PHYs
(for reference if we ever find out there is a problem with this patch).

> diff --git a/drivers/phy/mscc/phy-ocelot-serdes.c b/drivers/phy/mscc/phy-ocelot-serdes.c
> index c61a9890..77c46f6 100644
> --- a/drivers/phy/mscc/phy-ocelot-serdes.c
> +++ b/drivers/phy/mscc/phy-ocelot-serdes.c
> @@ -11,6 +11,7 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_platform.h>
> +#include <linux/phy.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
> @@ -104,20 +105,24 @@ struct serdes_mux {
>  	u8			idx;
>  	u8			port;
>  	enum phy_mode		mode;
> +	int			submode;
>  	u32			mask;
>  	u32			mux;
>  };
>  
> -#define SERDES_MUX(_idx, _port, _mode, _mask, _mux) {		\
> +#define SERDES_MUX(_idx, _port, _mode, _submode, _mask, _mux) {		\
>  	.idx = _idx,						\
>  	.port = _port,						\
>  	.mode = _mode,						\
> +	.submode = _submode,					\
>  	.mask = _mask,						\
>  	.mux = _mux,						\
>  }
>  
> -#define SERDES_MUX_SGMII(i, p, m, c) SERDES_MUX(i, p, PHY_MODE_SGMII, m, c)
> -#define SERDES_MUX_QSGMII(i, p, m, c) SERDES_MUX(i, p, PHY_MODE_QSGMII, m, c)
> +#define SERDES_MUX_SGMII(i, p, m, c) \
> +	SERDES_MUX(i, p, PHY_MODE_ETHERNET, PHY_INTERFACE_MODE_SGMII, m, c)
> +#define SERDES_MUX_QSGMII(i, p, m, c) \
> +	SERDES_MUX(i, p, PHY_MODE_ETHERNET, PHY_INTERFACE_MODE_QSGMII, m, c)
>  
>  static const struct serdes_mux ocelot_serdes_muxes[] = {
>  	SERDES_MUX_SGMII(SERDES1G(0), 0, 0, 0),
> @@ -154,7 +159,7 @@ static const struct serdes_mux ocelot_serdes_muxes[] = {
>  	SERDES_MUX_SGMII(SERDES6G(1), 8, 0, 0),
>  	SERDES_MUX_SGMII(SERDES6G(2), 10, HSIO_HW_CFG_PCIE_ENA |
>  			 HSIO_HW_CFG_DEV2G5_10_MODE, 0),
> -	SERDES_MUX(SERDES6G(2), 10, PHY_MODE_PCIE, HSIO_HW_CFG_PCIE_ENA,
> +	SERDES_MUX(SERDES6G(2), 10, PHY_MODE_PCIE, 0, HSIO_HW_CFG_PCIE_ENA,
>  		   HSIO_HW_CFG_PCIE_ENA),
>  };
>  
> @@ -164,12 +169,17 @@ static int serdes_set_mode(struct phy *phy, enum phy_mode mode, int submode)
>  	unsigned int i;
>  	int ret;
>  
> +	/* As of now only PHY_MODE_ETHERNET is supported */
> +	if (mode != PHY_MODE_ETHERNET)
> +		return -EOPNOTSUPP;
> +
>  	for (i = 0; i < ARRAY_SIZE(ocelot_serdes_muxes); i++) {
>  		if (macro->idx != ocelot_serdes_muxes[i].idx ||
> -		    mode != ocelot_serdes_muxes[i].mode)
> +		    mode != ocelot_serdes_muxes[i].mode ||
> +		    submode != ocelot_serdes_muxes[i].submode)
>  			continue;

We will most likely need to rework this to ignore the submode of the
PCIe muxing if the mode is PCIe but let´s figure this out when we add
support for PCIe muxing.

Thanks,
Quentin

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