linux-kernel - RE: [PATCH 3/4] phy: cadence-torrent: Do not configure SERDES if it's already configured

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Date:   Thu, 18 Mar 2021 09:55:47 +0000
From:   Swapnil Kashinath Jakhade <sjakhade@...ence.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Lokesh Vutla <lokeshvutla@...com>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>
Subject: RE: [PATCH 3/4] phy: cadence-torrent: Do not configure SERDES if it's
 already configured



> -----Original Message-----
> From: Kishon Vijay Abraham I <kishon@...com>
> Sent: Wednesday, March 10, 2021 9:25 PM
> To: Kishon Vijay Abraham I <kishon@...com>; Vinod Koul
> <vkoul@...nel.org>; Rob Herring <robh+dt@...nel.org>; Philipp Zabel
> <p.zabel@...gutronix.de>; Swapnil Kashinath Jakhade
> <sjakhade@...ence.com>
> Cc: linux-kernel@...r.kernel.org; devicetree@...r.kernel.org; Lokesh Vutla
> <lokeshvutla@...com>; linux-phy@...ts.infradead.org
> Subject: [PATCH 3/4] phy: cadence-torrent: Do not configure SERDES if it's
> already configured
> 
> EXTERNAL MAIL
> 
> 
> Do not configure torrent SERDES if it's already configured.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/phy/cadence/phy-cadence-torrent.c | 32 ++++++++++++++++-------
>  1 file changed, 22 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/phy/cadence/phy-cadence-torrent.c
> b/drivers/phy/cadence/phy-cadence-torrent.c
> index ab51c4bf7b30..5ee1657f5a1c 100644
> --- a/drivers/phy/cadence/phy-cadence-torrent.c
> +++ b/drivers/phy/cadence/phy-cadence-torrent.c
> @@ -371,6 +371,10 @@ static const struct phy_ops cdns_torrent_phy_ops =
> {
>  	.owner		= THIS_MODULE,
>  };
> 
> +static const struct phy_ops noop_ops = {
> +	.owner		= THIS_MODULE,
> +};
> +
>  struct cdns_reg_pairs {
>  	u32 val;
>  	u32 off;
> @@ -2306,6 +2310,7 @@ 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;
> 
> @@ -2344,16 +2349,20 @@ static int cdns_torrent_phy_probe(struct
> platform_device *pdev)
>  	if (ret)
>  		return ret;
> 
> -	ret = cdns_torrent_reset(cdns_phy);
> -	if (ret)
> -		goto clk_cleanup;
> +	regmap_field_read(cdns_phy->phy_pma_cmn_ctrl_1,
> &already_configured);
> 
> -	ret = cdns_torrent_clk(cdns_phy);
> -	if (ret)
> -		goto clk_cleanup;
> +	if (!already_configured) {
> +		ret = cdns_torrent_reset(cdns_phy);
> +		if (ret)
> +			goto clk_cleanup;
> +
> +		ret = cdns_torrent_clk(cdns_phy);
> +		if (ret)
> +			goto clk_cleanup;
> 
Should if (!already_configured) be checked while calling clk_disable_unprepare()?
Otherwise,
Reviewed-by: Swapnil Jakhade <sjakhade@...ence.com>

Thanks & regards,
Swapnil

> -	/* Enable APB */
> -	reset_control_deassert(cdns_phy->apb_rst);
> +		/* Enable APB */
> +		reset_control_deassert(cdns_phy->apb_rst);
> +	}
> 
>  	for_each_available_child_of_node(dev->of_node, child) {
>  		struct phy *gphy;
> @@ -2423,7 +2432,10 @@ static int cdns_torrent_phy_probe(struct
> platform_device *pdev)
>  		of_property_read_u32(child, "cdns,ssc-mode",
>  				     &cdns_phy->phys[node].ssc_mode);
> 
> -		gphy = devm_phy_create(dev, child,
> &cdns_torrent_phy_ops);
> +		if (!already_configured)
> +			gphy = devm_phy_create(dev, child,
> &cdns_torrent_phy_ops);
> +		else
> +			gphy = devm_phy_create(dev, child, &noop_ops);
>  		if (IS_ERR(gphy)) {
>  			ret = PTR_ERR(gphy);
>  			goto put_child;
> @@ -2507,7 +2519,7 @@ static int cdns_torrent_phy_probe(struct
> platform_device *pdev)
>  		goto put_lnk_rst;
>  	}
> 
> -	if (cdns_phy->nsubnodes > 1) {
> +	if (cdns_phy->nsubnodes > 1 && !already_configured) {
>  		ret = cdns_torrent_phy_configure_multilink(cdns_phy);
>  		if (ret)
>  			goto put_lnk_rst;
> --
> 2.17.1