[PATCH 4.19 73/79] usb: dwc3: fix PHY disable sequence

From: Greg Kroah-Hartman
Date: Tue Sep 13 2022 - 11:16:16 EST


From: Johan Hovold <johan@xxxxxxxxxx>

From: Johan Hovold <johan+linaro@xxxxxxxxxx>

commit d2ac7bef95c9ead307801ccb6cb6dfbeb14247bf upstream.

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@xxxxxxxxxxxxxxx # 4.8
Reviewed-by: Andrew Halaney <ahalaney@xxxxxxxxxx>
Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220804151001.23612-2-johan+linaro@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[ johan: adjust context to 4.19 ]
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)

--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -673,15 +673,16 @@ static void dwc3_core_exit(struct dwc3 *
{
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);
clk_bulk_disable(dwc->num_clks, dwc->clks);
clk_bulk_unprepare(dwc->num_clks, dwc->clks);
reset_control_assert(dwc->reset);
@@ -1509,16 +1510,16 @@ err5:
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: