linux-kernel - Re: [PATCH 5.15.y 4/4] phy: qcom-qmp-combo: fix runtime suspend

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Date:   Fri, 13 Jan 2023 09:09:35 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     stable@...r.kernel.org, Johan Hovold <johan+linaro@...nel.org>,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH 5.15.y 4/4] phy: qcom-qmp-combo: fix runtime suspend

On Thu, Jan 12, 2023 at 04:54:05PM -0800, Stephen Boyd wrote:
> From: Johan Hovold <johan+linaro@...nel.org>
> 
> commit c7b98de745cffdceefc077ad5cf9cda032ef8959 upstream.
> 
> Drop the confused runtime-suspend type check which effectively broke
> runtime PM if the DP child node happens to be parsed before the USB
> child node during probe (e.g. due to order of child nodes in the
> devicetree).
> 
> Instead use the new driver data USB PHY pointer to access the USB
> configuration and resources.
> 
> Fixes: 52e013d0bffa ("phy: qcom-qmp: Add support for DP in USB3+DP combo phy")
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> Link: https://lore.kernel.org/r/20221114081346.5116-6-johan+linaro@kernel.org
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> [swboyd@...omium.org: Backport to pre-split driver]
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index 9fda6d283f20..d928afe2ebba 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -4985,15 +4985,11 @@ static void qcom_qmp_phy_disable_autonomous_mode(struct qmp_phy *qphy)
>  static int __maybe_unused qcom_qmp_phy_runtime_suspend(struct device *dev)
>  {
>  	struct qcom_qmp *qmp = dev_get_drvdata(dev);
> -	struct qmp_phy *qphy = qmp->phys[0];
> +	struct qmp_phy *qphy = qmp->usb_phy;
>  	const struct qmp_phy_cfg *cfg = qphy->cfg;
>  
>  	dev_vdbg(dev, "Suspending QMP phy, mode:%d\n", qphy->mode);

So this doesn't work currently either as the usb_phy pointer is not set
for PCIe and UFS PHYs.

>  
> -	/* Supported only for USB3 PHY and luckily USB3 is the first phy */
> -	if (cfg->type != PHY_TYPE_USB3)
> -		return 0;
> -
>  	if (!qmp->init_count) {
>  		dev_vdbg(dev, "PHY not initialized, bailing out\n");
>  		return 0;

Johan