[PATCH 1/8] usb: dwc3: fix PHY disable sequence

From: Johan Hovold <johan+linaro@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Felipe Balbi <balbi@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
	Konrad Dybcio <konrad.dybcio@somainline.org>,
	Krishna Kurapati <quic_kriskura@quicinc.com>,
	Stephen Boyd <swboyd@chromium.org>,
	Doug Anderson <dianders@chromium.org>,
	"Matthias Kaehlcke" <mka@chromium.org>,
	Pavankumar Kondeti <quic_pkondeti@quicinc.com>,
	quic_ppratap@quicinc.com, quic_vpulyala@quicinc.com,
	linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Johan Hovold <johan+linaro@kernel.org>,
	stable@vger.kernel.org
Subject: [PATCH 1/8] usb: dwc3: fix PHY disable sequence
Date: Tue,  2 Aug 2022 17:13:57 +0200	[thread overview]
Message-ID: <20220802151404.1797-2-johan+linaro@kernel.org> (raw)
In-Reply-To: <20220802151404.1797-1-johan+linaro@kernel.org>

Generic PHYs must be powered-off before they can be tore down.

Similarly, suspending legacy PHYs after having powered them off makes no
sense.

Fix the dwc3_core_exit() (e.g. called during suspend) and open-coded
dwc3_probe() error-path sequences that got this wrong.

Note that this makes dwc3_core_exit() match the dwc3_core_init() error
path with respect to powering off the PHYs.

Fixes: 03c1fd622f72 ("usb: dwc3: core: add phy cleanup for probe error handling")
Fixes: c499ff71ff2a ("usb: dwc3: core: re-factor init and exit paths")
Cc: stable@vger.kernel.org      # 4.8
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 drivers/usb/dwc3/core.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c5c238ab3083..16d1f328775f 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -833,15 +833,16 @@ static void dwc3_core_exit(struct dwc3 *dwc)
 {
 	dwc3_event_buffers_cleanup(dwc);
 
+	usb_phy_set_suspend(dwc->usb2_phy, 1);
+	usb_phy_set_suspend(dwc->usb3_phy, 1);
+	phy_power_off(dwc->usb2_generic_phy);
+	phy_power_off(dwc->usb3_generic_phy);
+
 	usb_phy_shutdown(dwc->usb2_phy);
 	usb_phy_shutdown(dwc->usb3_phy);
 	phy_exit(dwc->usb2_generic_phy);
 	phy_exit(dwc->usb3_generic_phy);
 
-	usb_phy_set_suspend(dwc->usb2_phy, 1);
-	usb_phy_set_suspend(dwc->usb3_phy, 1);
-	phy_power_off(dwc->usb2_generic_phy);
-	phy_power_off(dwc->usb3_generic_phy);
 	dwc3_clk_disable(dwc);
 	reset_control_assert(dwc->reset);
 }
@@ -1879,16 +1880,16 @@ static int dwc3_probe(struct platform_device *pdev)
 	dwc3_debugfs_exit(dwc);
 	dwc3_event_buffers_cleanup(dwc);
 
-	usb_phy_shutdown(dwc->usb2_phy);
-	usb_phy_shutdown(dwc->usb3_phy);
-	phy_exit(dwc->usb2_generic_phy);
-	phy_exit(dwc->usb3_generic_phy);
-
 	usb_phy_set_suspend(dwc->usb2_phy, 1);
 	usb_phy_set_suspend(dwc->usb3_phy, 1);
 	phy_power_off(dwc->usb2_generic_phy);
 	phy_power_off(dwc->usb3_generic_phy);
 
+	usb_phy_shutdown(dwc->usb2_phy);
+	usb_phy_shutdown(dwc->usb3_phy);
+	phy_exit(dwc->usb2_generic_phy);
+	phy_exit(dwc->usb3_generic_phy);
+
 	dwc3_ulpi_exit(dwc);
 
 err4:
-- 
2.35.1

