linux-kernel - [PATCH v2] phy: exynos5-usbdrd: Fix broken USB on Exynos5422 (TYPEC dependency)

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Message-ID: <20250216114136.245814-1-krzysztof.kozlowski@linaro.org>
Date: Sun, 16 Feb 2025 12:41:36 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	André Draszik <andre.draszik@...aro.org>,
	Peter Griffin <peter.griffin@...aro.org>,
	linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: [PATCH v2] phy: exynos5-usbdrd: Fix broken USB on Exynos5422 (TYPEC dependency)

Older Exynos designs, like Exynos5422, do not have USB Type-C and the
USB DRD PHY does not really depend on Type-C for these devices at all.
Incorrectly added optional dependency on CONFIG_TYPEC caused this driver
to be missing for exynos_defconfig and as result Exynos5422-based boards
like Hardkernel Odroid HC1 failed to probe USB.

However ARM64 boards should have CONFIG_TYPEC enabled and in proper
state (e.g. =y when PHY_EXYNOS5_USBDRD is =y) for proper USB support on
Google GS101 boards.

Add itermediate CONFIG_PHY_EXYNOS5_USBDRD_TYPEC symbol to skip TYPEC on
older boards, while still expressing optional dependency.

Reported-by: Krzysztof Kozlowski <krzk@...nel.org>
Closes: https://krzk.eu/#/builders/21/builds/6139
Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
Closes: https://lore.kernel.org/all/3c0b77e6-357d-453e-8b63-4757c3231bde@samsung.com/
Fixes: 09dc674295a3 ("phy: exynos5-usbdrd: subscribe to orientation notifier if required")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

---

Patch for issue in linux-next

Changes in v2:
1. Add PHY_EXYNOS5_USBDRD_TYPEC, so arm64 defconfig will have both
   symbols in-sync
---
 drivers/phy/samsung/Kconfig              | 12 +++++++++++-
 drivers/phy/samsung/phy-exynos5-usbdrd.c |  1 +
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/samsung/Kconfig b/drivers/phy/samsung/Kconfig
index 7fba571c0e2b..b20ac6b75993 100644
--- a/drivers/phy/samsung/Kconfig
+++ b/drivers/phy/samsung/Kconfig
@@ -77,12 +77,22 @@ config PHY_S5PV210_USB2
 	  particular SoC is compiled in the driver. In case of S5PV210 two phys
 	  are available - device and host.
 
+# None of ARM32 Samsung boards use Type-C, however newer ARM64 do and
+# PHY_EXYNOS5_USBDRD driver needs TYPEC to be in a matching state to avoid link
+# failures (see optional dependencies in kconfig-language.rst).  Intermediate
+# PHY_EXYNOS5_USBDRD_TYPEC symbol allows to skip TYPEC on ARM32 boards.
+config PHY_EXYNOS5_USBDRD_TYPEC
+	tristate
+	depends on ARCH_EXYNOS
+	depends on ARM || TYPEC || !TYPEC
+	default y
+
 config PHY_EXYNOS5_USBDRD
 	tristate "Exynos5 SoC series USB DRD PHY driver"
 	depends on (ARCH_EXYNOS && OF) || COMPILE_TEST
 	depends on HAS_IOMEM
-	depends on TYPEC || (TYPEC=n && COMPILE_TEST)
 	depends on USB_DWC3_EXYNOS
+	depends on PHY_EXYNOS5_USBDRD_TYPEC
 	select GENERIC_PHY
 	select MFD_SYSCON
 	default y
diff --git a/drivers/phy/samsung/phy-exynos5-usbdrd.c b/drivers/phy/samsung/phy-exynos5-usbdrd.c
index ff2436f11d68..6d571dff2898 100644
--- a/drivers/phy/samsung/phy-exynos5-usbdrd.c
+++ b/drivers/phy/samsung/phy-exynos5-usbdrd.c
@@ -1456,6 +1456,7 @@ static int exynos5_usbdrd_setup_notifiers(struct exynos5_usbdrd_phy *phy_drd)
 {
 	int ret;
 
+	/* See CONFIG_PHY_EXYNOS5_USBDRD_TYPEC */
 	if (!IS_ENABLED(CONFIG_TYPEC))
 		return 0;
 
-- 
2.43.0