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Message-ID: <a5f3e0f9-6574-1e41-fd4d-7faa3a3fbd3d@intel.com>
Date: Tue, 11 Apr 2023 08:44:37 -0700
From: Jesse Brandeburg <jesse.brandeburg@...el.com>
To: Daniel Golle <daniel@...rotopia.org>, <netdev@...r.kernel.org>,
<linux-mediatek@...ts.infradead.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, Sean Wang <sean.wang@...iatek.com>,
"Landen Chao" <Landen.Chao@...iatek.com>,
DENG Qingfang <dqfext@...il.com>,
Arınç ÜNAL <arinc.unal@...nc9.com>,
Russell King <linux@...linux.org.uk>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Paolo Abeni <pabeni@...hat.com>,
Jakub Kicinski <kuba@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
Vladimir Oltean <olteanv@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next] net: dsa: mt7530: fix support for MT7531BE
On 4/10/2023 5:11 PM, Daniel Golle wrote:
> There are two variants of the MT7531 switch IC which got different
> features (and pins) regarding port 5:
> * MT7531AE: SGMII/1000Base-X/2500Base-X SerDes
> * MT7531BE: RGMII
>
> Moving the creation of the SerDes PCS from mt753x_setup to mt7530_probe
> with commit 6de285229773 ("net: dsa: mt7530: move SGMII PCS creation to
> mt7530_probe function") works fine for MT7531AE which got two instances
> of mtk-pcs-lynxi, however, MT7531BE requires mt7531_pll_setup to setup
> clocks before the single PCS on port 6 (usually used as CPU port)
> starts to work and hence the PCS creation failed on MT7531BE.
>
> Fix this by introducing a pointer to mt7531_create_sgmii function in
> struct mt7530_priv and call it again at the end of mt753x_setup like it
> was before commit 6de285229773 ("net: dsa: mt7530: move SGMII PCS
> creation to mt7530_probe function").
>
> Fixes: 6de285229773 ("net: dsa: mt7530: move SGMII PCS creation to mt7530_probe function")
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
> drivers/net/dsa/mt7530-mdio.c | 14 +++++++-------
> drivers/net/dsa/mt7530.c | 6 ++++++
> drivers/net/dsa/mt7530.h | 4 ++++
> 3 files changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/dsa/mt7530-mdio.c b/drivers/net/dsa/mt7530-mdio.c
> index 34a547b88e497..f17eab67d15fa 100644
> --- a/drivers/net/dsa/mt7530-mdio.c
> +++ b/drivers/net/dsa/mt7530-mdio.c
> @@ -81,14 +81,17 @@ static const struct regmap_bus mt7530_regmap_bus = {
> };
>
> static int
> -mt7531_create_sgmii(struct mt7530_priv *priv)
> +mt7531_create_sgmii(struct mt7530_priv *priv, bool dual_sgmii)
> {
> struct regmap_config *mt7531_pcs_config[2];
[1] use = {};
> struct phylink_pcs *pcs;
> struct regmap *regmap;
> int i, ret = 0;
>
> - for (i = 0; i < 2; i++) {
> + /* MT7531AE has two SGMII units for port 5 and port 6
> + * MT7531BE has only one SGMII unit for port 6
> + */
> + for (i = dual_sgmii ? 0 : 1; i < 2; i++) {
> mt7531_pcs_config[i] = devm_kzalloc(priv->dev,
hm, I don't like this, you're no longer initializing array[0] if
dual_sgmii is set. This seems like a recipe for disaster.
you could initialize the array to NULL above when allocating this on the
stack? [1]
> sizeof(struct regmap_config),
> GFP_KERNEL);
> @@ -208,11 +211,8 @@ mt7530_probe(struct mdio_device *mdiodev)
> if (IS_ERR(priv->regmap))
> return PTR_ERR(priv->regmap);
>
> - if (priv->id == ID_MT7531) {
> - ret = mt7531_create_sgmii(priv);
> - if (ret)
> - return ret;
> - }
> + if (priv->id == ID_MT7531)
> + priv->create_sgmii = mt7531_create_sgmii;
>
> return dsa_register_switch(priv->ds);
> }
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index e4bb5037d3525..c680873819b01 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -3018,6 +3018,12 @@ mt753x_setup(struct dsa_switch *ds)
> if (ret && priv->irq)
> mt7530_free_irq_common(priv);
>
> + if (priv->create_sgmii) {
> + ret = priv->create_sgmii(priv, mt7531_dual_sgmii_supported(priv));
> + if (ret && priv->irq)
> + mt7530_free_irq(priv);
> + }
> +
> return ret;
> }
>
> diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
> index 01db5c9724fa8..6e89578b4de02 100644
> --- a/drivers/net/dsa/mt7530.h
> +++ b/drivers/net/dsa/mt7530.h
> @@ -752,6 +752,8 @@ struct mt753x_info {
> * @irq: IRQ number of the switch
> * @irq_domain: IRQ domain of the switch irq_chip
> * @irq_enable: IRQ enable bits, synced to SYS_INT_EN
> + *
no extra blank line needed here.
> + * @create_sgmii: Pointer to function creating SGMII PCS instance(s)
> */
> struct mt7530_priv {
> struct device *dev;
> @@ -778,6 +780,8 @@ struct mt7530_priv {
> int irq;
> struct irq_domain *irq_domain;
> u32 irq_enable;
> +
> + int (*create_sgmii)(struct mt7530_priv *priv, bool dual_sgmii);
> };
>
> struct mt7530_hw_vlan_entry {
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