[PATCH v2 1/3] phy: Fix generic_setup_phy() return value on power on failure

[Jonas Karlman]

generic_phy_exit() typically return 0 for a struct phy that has been
initialized with a generic_phy_init() call.

generic_setup_phy() returns the value from a generic_phy_exit() call
when generic_phy_power_on() fails. This hides the failed state of the
power_on ops from the caller of generic_setup_phy().

Fix this by ignoring the return value of the generic_phy_exit() call and
return the value from the generic_phy_power_on() call.

Fixes: 84e561407a5f ("phy: Add generic_{setup,shutdown}_phy() helpers")
Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
v2:
- Move refactor to own patch
- Add unit test

 drivers/phy/phy-uclass.c |  2 +-
 test/dm/phy.c            | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/phy-uclass.c b/drivers/phy/phy-uclass.c
index 7d707c022934..d745e7babc12 100644
--- a/drivers/phy/phy-uclass.c
+++ b/drivers/phy/phy-uclass.c
@@ -526,7 +526,7 @@ int generic_setup_phy(struct udevice *dev, struct phy *phy, int index)
 
 		ret = generic_phy_power_on(phy);
 		if (ret)
-			ret = generic_phy_exit(phy);
+			generic_phy_exit(phy);
 	}
 
 	return ret;
diff --git a/test/dm/phy.c b/test/dm/phy.c
index 2abd27b22d6d..4da4841f40f7 100644
--- a/test/dm/phy.c
+++ b/test/dm/phy.c
@@ -234,3 +234,27 @@ static int dm_test_phy_multi_exit(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_phy_multi_exit, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+
+static int dm_test_phy_setup(struct unit_test_state *uts)
+{
+	struct phy phy;
+	struct udevice *parent;
+
+	ut_assertok(uclass_get_device_by_name(UCLASS_SIMPLE_BUS,
+					      "gen_phy_user", &parent));
+
+	/* normal */
+	ut_assertok(generic_setup_phy(parent, &phy, 0));
+	ut_assertok(generic_shutdown_phy(&phy));
+
+	/* power_off fail with -EIO */
+	ut_assertok(generic_setup_phy(parent, &phy, 1));
+	ut_asserteq(-EIO, generic_shutdown_phy(&phy));
+
+	/* power_on fail with -EIO */
+	ut_asserteq(-EIO, generic_setup_phy(parent, &phy, 2));
+	ut_assertok(generic_shutdown_phy(&phy));
+
+	return 0;
+}
+DM_TEST(dm_test_phy_setup, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
-- 
2.42.0