linux-kernel - [PATCH AUTOSEL 6.14 451/642] phy: core: don't require set_mode() callback for phy_get

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Message-Id: <20250505221419.2672473-451-sashal@kernel.org>
Date: Mon,  5 May 2025 18:11:07 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Damon Ding <damon.ding@...k-chips.com>,
	Vinod Koul <vkoul@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	kishon@...nel.org,
	linux-phy@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.14 451/642] phy: core: don't require set_mode() callback for phy_get_mode() to work

From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

[ Upstream commit d58c04e305afbaa9dda7969151f06c4efe2c98b0 ]

As reported by Damon Ding, the phy_get_mode() call doesn't work as
expected unless the PHY driver has a .set_mode() call. This prompts PHY
drivers to have empty stubs for .set_mode() for the sake of being able
to get the mode.

Make .set_mode() callback truly optional and update PHY's mode even if
it there is none.

Cc: Damon Ding <damon.ding@...k-chips.com>
Link: https://lore.kernel.org/r/96f8310f-93f1-4bcb-8637-137e1159ff83@rock-chips.com
Tested-by: Damon Ding <damon.ding@...k-chips.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Link: https://lore.kernel.org/r/20250209-phy-fix-set-moe-v2-1-76e248503856@linaro.org
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/phy/phy-core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 8dfdce605a905..067316dfcd83a 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -405,13 +405,14 @@ EXPORT_SYMBOL_GPL(phy_power_off);
 
 int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode)
 {
-	int ret;
+	int ret = 0;
 
-	if (!phy || !phy->ops->set_mode)
+	if (!phy)
 		return 0;
 
 	mutex_lock(&phy->mutex);
-	ret = phy->ops->set_mode(phy, mode, submode);
+	if (phy->ops->set_mode)
+		ret = phy->ops->set_mode(phy, mode, submode);
 	if (!ret)
 		phy->attrs.mode = mode;
 	mutex_unlock(&phy->mutex);
-- 
2.39.5