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Message-ID: <ZJIDt9jDaZY4cw1A@corigine.com>
Date: Tue, 20 Jun 2023 21:53:27 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org, netdev@...r.kernel.org,
Johan Hovold <johan@...nel.org>,
Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: Re: [PATCH net-next] net: phy: at803x: Use
devm_regulator_get_enable_optional()
+ Johan and Wolfram
On Tue, Jun 20, 2023 at 07:45:24PM +0200, Christophe JAILLET wrote:
> Le 17/06/2023 à 16:24, Christophe JAILLET a écrit :
> > Use devm_regulator_get_enable_optional() instead of hand writing it. It
> > saves some line of code.
> >
> > Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> > ---
> > Compile tested-only.
> >
> > If my reading is correct, regulator_disable() is still called in the same
> > order, should an error occur or the driver be removed.
> > ---
> > drivers/net/phy/at803x.c | 44 +++++++---------------------------------
> > 1 file changed, 7 insertions(+), 37 deletions(-)
> >
> > diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> > index 656136628ffd..c1f307d90518 100644
> > --- a/drivers/net/phy/at803x.c
> > +++ b/drivers/net/phy/at803x.c
> > @@ -304,7 +304,6 @@ struct at803x_priv {
> > bool is_1000basex;
> > struct regulator_dev *vddio_rdev;
> > struct regulator_dev *vddh_rdev;
> > - struct regulator *vddio;
> > u64 stats[ARRAY_SIZE(at803x_hw_stats)];
> > };
> > @@ -824,11 +823,11 @@ static int at803x_parse_dt(struct phy_device *phydev)
> > if (ret < 0)
> > return ret;
> > - priv->vddio = devm_regulator_get_optional(&phydev->mdio.dev,
> > - "vddio");
> > - if (IS_ERR(priv->vddio)) {
>
> Hi,
>
> my patch is not broken by itself, but the existing code looks spurious.
>
> If the optional regulator is not found, then -ENODEV is returned,
> at803x_parse_dt() will return this error and the probe will fail.
>
> It looks that the test should be more subtle.
>
> I can send a follow up patch, unless there is a better way to fix the
> pre-existing issue.
>
> See [1] for a more detailed explanation.
>
> CJ
>
> [1]: https://lore.kernel.org/all/ZJFqCQ8bbBoX3l1g@hovoldconsulting.com/
My understanding is that this patch cleans things up (good)
and retains some dubious behaviour (not making it worse or better).
Meanwhile, a solution to the dubious behaviour was discussed in
the context of [1] and moreover a patch linked from there and associated
solution from Wolfram.
If so. I guess we can either:
1) Move forwards with this patch and
then follow-up with the preferred solution for the dubious behaviour,
once that solution is decided upon and available.
2) Skip this patch and follow-up later.
FWIIW, either seems fine to me.
> > + ret = devm_regulator_get_enable_optional(&phydev->mdio.dev,
> > + "vddio");
> > + if (ret) {
> > phydev_err(phydev, "failed to get VDDIO regulator\n");
> > - return PTR_ERR(priv->vddio);
> > + return ret;
> > }
> > /* Only AR8031/8033 support 1000Base-X for SFP modules */
> > @@ -856,12 +855,6 @@ static int at803x_probe(struct phy_device *phydev)
> > if (ret)
> > return ret;
> > - if (priv->vddio) {
> > - ret = regulator_enable(priv->vddio);
> > - if (ret < 0)
> > - return ret;
> > - }
> > -
> > if (phydev->drv->phy_id == ATH8031_PHY_ID) {
> > int ccr = phy_read(phydev, AT803X_REG_CHIP_CONFIG);
> > int mode_cfg;
> > @@ -869,10 +862,8 @@ static int at803x_probe(struct phy_device *phydev)
> > .wolopts = 0,
> > };
> > - if (ccr < 0) {
> > - ret = ccr;
> > - goto err;
> > - }
> > + if (ccr < 0)
> > + return ccr;
> > mode_cfg = ccr & AT803X_MODE_CFG_MASK;
> > switch (mode_cfg) {
> > @@ -890,25 +881,11 @@ static int at803x_probe(struct phy_device *phydev)
> > ret = at803x_set_wol(phydev, &wol);
> > if (ret < 0) {
> > phydev_err(phydev, "failed to disable WOL on probe: %d\n", ret);
> > - goto err;
> > + return ret;
> > }
> > }
> > return 0;
> > -
> > -err:
> > - if (priv->vddio)
> > - regulator_disable(priv->vddio);
> > -
> > - return ret;
> > -}
> > -
> > -static void at803x_remove(struct phy_device *phydev)
> > -{
> > - struct at803x_priv *priv = phydev->priv;
> > -
> > - if (priv->vddio)
> > - regulator_disable(priv->vddio);
> > }
> > static int at803x_get_features(struct phy_device *phydev)
> > @@ -2021,7 +1998,6 @@ static struct phy_driver at803x_driver[] = {
> > .name = "Qualcomm Atheros AR8035",
> > .flags = PHY_POLL_CABLE_TEST,
> > .probe = at803x_probe,
> > - .remove = at803x_remove,
> > .config_aneg = at803x_config_aneg,
> > .config_init = at803x_config_init,
> > .soft_reset = genphy_soft_reset,
> > @@ -2043,7 +2019,6 @@ static struct phy_driver at803x_driver[] = {
> > .name = "Qualcomm Atheros AR8030",
> > .phy_id_mask = AT8030_PHY_ID_MASK,
> > .probe = at803x_probe,
> > - .remove = at803x_remove,
> > .config_init = at803x_config_init,
> > .link_change_notify = at803x_link_change_notify,
> > .set_wol = at803x_set_wol,
> > @@ -2059,7 +2034,6 @@ static struct phy_driver at803x_driver[] = {
> > .name = "Qualcomm Atheros AR8031/AR8033",
> > .flags = PHY_POLL_CABLE_TEST,
> > .probe = at803x_probe,
> > - .remove = at803x_remove,
> > .config_init = at803x_config_init,
> > .config_aneg = at803x_config_aneg,
> > .soft_reset = genphy_soft_reset,
> > @@ -2082,7 +2056,6 @@ static struct phy_driver at803x_driver[] = {
> > PHY_ID_MATCH_EXACT(ATH8032_PHY_ID),
> > .name = "Qualcomm Atheros AR8032",
> > .probe = at803x_probe,
> > - .remove = at803x_remove,
> > .flags = PHY_POLL_CABLE_TEST,
> > .config_init = at803x_config_init,
> > .link_change_notify = at803x_link_change_notify,
> > @@ -2100,7 +2073,6 @@ static struct phy_driver at803x_driver[] = {
> > PHY_ID_MATCH_EXACT(ATH9331_PHY_ID),
> > .name = "Qualcomm Atheros AR9331 built-in PHY",
> > .probe = at803x_probe,
> > - .remove = at803x_remove,
> > .suspend = at803x_suspend,
> > .resume = at803x_resume,
> > .flags = PHY_POLL_CABLE_TEST,
> > @@ -2117,7 +2089,6 @@ static struct phy_driver at803x_driver[] = {
> > PHY_ID_MATCH_EXACT(QCA9561_PHY_ID),
> > .name = "Qualcomm Atheros QCA9561 built-in PHY",
> > .probe = at803x_probe,
> > - .remove = at803x_remove,
> > .suspend = at803x_suspend,
> > .resume = at803x_resume,
> > .flags = PHY_POLL_CABLE_TEST,
> > @@ -2183,7 +2154,6 @@ static struct phy_driver at803x_driver[] = {
> > .name = "Qualcomm QCA8081",
> > .flags = PHY_POLL_CABLE_TEST,
> > .probe = at803x_probe,
> > - .remove = at803x_remove,
> > .config_intr = at803x_config_intr,
> > .handle_interrupt = at803x_handle_interrupt,
> > .get_tunable = at803x_get_tunable,
>
>
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