linux-kernel - Re: [PATCH] phy: core: Add consumer device link support

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Date:   Fri, 7 Feb 2020 10:46:47 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     youling257 <youling257@...il.com>, <alexandre.torgue@...com>
CC:     <yoshihiro.shimoda.uh@...esas.com>, <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] phy: core: Add consumer device link support

Hi,

On 06/02/20 7:09 PM, youling257 wrote:
> This patch cause "dwc3 dwc3.3.auto: failed to create device link to dwc3.3.auto.ulpi" problem.
> https://bugzilla.kernel.org/show_bug.cgi?id=206435

I'm suspecting there is some sort of reverse dependency with dwc3 ULPI.
Can you try the following diff?

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 2eb28cc2d2dc..397311dcb116 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -687,7 +687,7 @@ struct phy *phy_get(struct device *dev, const char
*string)

        get_device(&phy->dev);

-       link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
+       link = device_link_add(dev, &phy->dev, DL_FLAG_SYNC_STATE_ONLY);
        if (!link) {
                dev_err(dev, "failed to create device link to %s\n",
                        dev_name(phy->dev.parent));
@@ -802,7 +802,7 @@ struct phy *devm_of_phy_get(struct device *dev,
struct device_node *np,
                return phy;
        }

-       link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
+       link = device_link_add(dev, &phy->dev, DL_FLAG_SYNC_STATE_ONLY);
        if (!link) {
                dev_err(dev, "failed to create device link to %s\n",
                        dev_name(phy->dev.parent));
@@ -851,7 +851,7 @@ struct phy *devm_of_phy_get_by_index(struct device
*dev, struct device_node *np,
        *ptr = phy;
        devres_add(dev, ptr);

-       link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
+       link = device_link_add(dev, &phy->dev, DL_FLAG_SYNC_STATE_ONLY);
        if (!link) {
                dev_err(dev, "failed to create device link to %s\n",
                        dev_name(phy->dev.parent));

Thanks
Kishon