linux-kernel - RE: [EXT] Re: [PATCH] Revert "phy: cadence-torrent: Do not configure SERDES if it's already configured"

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Date:   Thu, 23 Dec 2021 06:27:40 +0000
From:   Li Chen <lchen@...arella.com>
To:     Vinod Koul <vkoul@...nel.org>
CC:     Kishon Vijay Abraham I <kishon@...com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Swapnil Jakhade <sjakhade@...ence.com>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: RE: [EXT] Re: [PATCH] Revert "phy: cadence-torrent: Do not configure
 SERDES if it's already configured"

Hi, Vinod

> -----Original Message-----
> From: Vinod Koul [mailto:vkoul@...nel.org]
> Sent: Thursday, December 23, 2021 1:27 PM
> To: Li Chen
> Cc: Kishon Vijay Abraham I; Philipp Zabel; Swapnil Jakhade; linux-
> phy@...ts.infradead.org; linux-kernel@...r.kernel.org; Dan Carpenter
> Subject: [EXT] Re: [PATCH] Revert "phy: cadence-torrent: Do not configure
> SERDES if it's already configured"
> 
> On 26-11-21, 05:06, Li Chen wrote:
> > This reverts commit
> > b69d39f68419("phy: cadence-torrent: Do not configure SERDES if it's already
> configured")
> 
> space between commit id and open brace...
> 
> >
> > our soc will hang on any regmap field read before reset.
> 
> okay, in this case the right fix would be to keep track of reset in SW
> and still skip reset if it is already configured?
> 

I should be grateful if you would give me more details of reset in SW.

> >
> > Signed-off-by: Li Chen <lchen@...arella.com>
> > ---
> >  drivers/phy/cadence/phy-cadence-torrent.c | 31 +++++++----------------
> >  1 file changed, 9 insertions(+), 22 deletions(-)
> >
> > diff --git a/drivers/phy/cadence/phy-cadence-torrent.c
> b/drivers/phy/cadence/phy-cadence-torrent.c
> > index 415ace64adc5c..e57e0b1523aff 100644
> > --- a/drivers/phy/cadence/phy-cadence-torrent.c
> > +++ b/drivers/phy/cadence/phy-cadence-torrent.c
> > @@ -2031,11 +2031,6 @@ static int cdns_torrent_noop_phy_on(struct phy
> *phy)
> >  	return 0;
> >  }
> >
> > -static const struct phy_ops noop_ops = {
> > -	.power_on	= cdns_torrent_noop_phy_on,
> > -	.owner		= THIS_MODULE,
> > -};
> > -
> >  static
> >  int cdns_torrent_phy_configure_multilink(struct cdns_torrent_phy *cdns_phy)
> >  {
> > @@ -2282,7 +2277,6 @@ static int cdns_torrent_phy_probe(struct
> platform_device *pdev)
> >  	struct device_node *child;
> >  	int ret, subnodes, node = 0, i;
> >  	u32 total_num_lanes = 0;
> > -	int already_configured;
> >  	u8 init_dp_regmap = 0;
> >  	u32 phy_type;
> >
> > @@ -2321,20 +2315,16 @@ static int cdns_torrent_phy_probe(struct
> platform_device *pdev)
> >  	if (ret)
> >  		return ret;
> >
> > -	regmap_field_read(cdns_phy->phy_pma_cmn_ctrl_1,
> &already_configured);
> > -
> > -	if (!already_configured) {
> > -		ret = cdns_torrent_reset(cdns_phy);
> > -		if (ret)
> > -			goto clk_cleanup;
> > +	ret = cdns_torrent_reset(cdns_phy);
> > +	if (ret)
> > +		goto clk_cleanup;
> >
> > -		ret = cdns_torrent_clk(cdns_phy);
> > -		if (ret)
> > -			goto clk_cleanup;
> > +	ret = cdns_torrent_clk(cdns_phy);
> > +	if (ret)
> > +		goto clk_cleanup;
> >
> >  		/* Enable APB */
> > -		reset_control_deassert(cdns_phy->apb_rst);
> > -	}
> > +	reset_control_deassert(cdns_phy->apb_rst);
> >
> >  	for_each_available_child_of_node(dev->of_node, child) {
> >  		struct phy *gphy;
> > @@ -2404,10 +2394,7 @@ static int cdns_torrent_phy_probe(struct
> platform_device *pdev)
> >  		of_property_read_u32(child, "cdns,ssc-mode",
> >  				     &cdns_phy->phys[node].ssc_mode);
> >
> > -		if (!already_configured)
> > -			gphy = devm_phy_create(dev, child,
> &cdns_torrent_phy_ops);
> > -		else
> > -			gphy = devm_phy_create(dev, child, &noop_ops);
> > +		gphy = devm_phy_create(dev, child, &cdns_torrent_phy_ops);
> >  		if (IS_ERR(gphy)) {
> >  			ret = PTR_ERR(gphy);
> >  			goto put_child;
> > @@ -2490,7 +2477,7 @@ static int cdns_torrent_phy_probe(struct
> platform_device *pdev)
> >  		goto put_lnk_rst;
> >  	}
> >
> > -	if (cdns_phy->nsubnodes > 1 && !already_configured) {
> > +	if (cdns_phy->nsubnodes > 1) {
> >  		ret = cdns_torrent_phy_configure_multilink(cdns_phy);
> >  		if (ret)
> >  			goto put_lnk_rst;
> > --
> > 2.33.1
> >
> >
> >
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> 
> Aha!!!
> 
> Okay destroyed this now!
> 
> --
> ~Vinod
> 
> ##############################################################
> ########
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Regards,
Li