[PATCH v3 14/18] phy: cadence-torrent: add suspend and resume support

[Philipp Zabel]

On Do, 2024-02-15 at 16:17 +0100, Thomas Richard wrote:
> Add suspend and resume support.
> 
> The already_configured flag is cleared during the suspend stage to force
> the PHY initialization during the resume stage.
> 
> Based on the work of Théo Lebrun <theo.lebrun at bootlin.com>
> 
> Signed-off-by: Thomas Richard <thomas.richard at bootlin.com>
> ---
>  drivers/phy/cadence/phy-cadence-torrent.c | 54 +++++++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 
> diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
> index 52cadca4c07b..f8945a11e7ca 100644
> --- a/drivers/phy/cadence/phy-cadence-torrent.c
> +++ b/drivers/phy/cadence/phy-cadence-torrent.c
> @@ -3005,6 +3005,59 @@ static void cdns_torrent_phy_remove(struct platform_device *pdev)
>  	cdns_torrent_clk_cleanup(cdns_phy);
>  }
>  
> +static int cdns_torrent_phy_suspend_noirq(struct device *dev)
> +{
> +	struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(dev);
> +	int i;
> +
> +	reset_control_assert(cdns_phy->phy_rst);
> +	reset_control_assert(cdns_phy->apb_rst);
> +	for (i = 0; i < cdns_phy->nsubnodes; i++)
> +		reset_control_assert(cdns_phy->phys[i].lnk_rst);
> +
> +	if (cdns_phy->already_configured)
> +		cdns_phy->already_configured = 0;
> +	else
> +		clk_disable_unprepare(cdns_phy->clk);
> +
> +	return 0;
> +}
> +
> +static int cdns_torrent_phy_resume_noirq(struct device *dev)
> +{
> +	struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(dev);
> +	int node = cdns_phy->nsubnodes;
> +	int ret, i;
> +
> +	ret = cdns_torrent_clk(cdns_phy);
> +	if (ret)
> +		goto clk_cleanup;
> +
> +	/* Enable APB */
> +	reset_control_deassert(cdns_phy->apb_rst);
> +
> +	if (cdns_phy->nsubnodes > 1) {
> +		ret = cdns_torrent_phy_configure_multilink(cdns_phy);
> +		if (ret)
> +			goto put_lnk_rst;
> +	}
> +
> +	return 0;
> +
> +put_lnk_rst:
> +	for (i = 0; i < node; i++)
> +		reset_control_assert(cdns_phy->phys[i].lnk_rst);

The same cleanup is found in probe. Would it be cleaner to move this
into cdns_torrent_phy_configure_multilink() instead of duplicating it
here?

> +	reset_control_assert(cdns_phy->apb_rst);
> +	clk_disable_unprepare(cdns_phy->clk);
> +clk_cleanup:
> +	cdns_torrent_clk_cleanup(cdns_phy);

This calls of_clk_del_provider(), seems misplaced here.

regards
Philipp