[PATCH stable-5.15 0/3] usb: dwc3: 5.15 backports

[PATCH stable-5.15 0/3] usb: dwc3: 5.15 backports

[Johan Hovold]

Here are backports of the three patches that failed to apply to 5.15 due
to trivial context conflicts.

Hopefully they apply to the older stable trees as well as-is.

Note that the last patch depends on features that were not added until
5.9 as mentioned in the commit message. Note that the author of that
patch did not add a stable tag for this one, but backporting shouldn't
hurt.

Johan


Johan Hovold (3):
  usb: dwc3: fix PHY disable sequence
  usb: dwc3: qcom: fix use-after-free on runtime-PM wakeup
  usb: dwc3: disable USB core PHY management

 drivers/usb/dwc3/core.c      | 19 ++++++++++---------
 drivers/usb/dwc3/dwc3-qcom.c | 14 +++++++++++++-
 drivers/usb/dwc3/host.c      | 11 +++++++++++
 3 files changed, 34 insertions(+), 10 deletions(-)

-- 
2.35.1

[PATCH stable-5.15 1/3] usb: dwc3: fix PHY disable sequence

[Johan Hovold]

From: Johan Hovold <johan+linaro@kernel.org>

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@vger.kernel.org      # 4.8
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220804151001.23612-2-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ johan: adjust context to 5.15 ]
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 cfac5503aa66..9c24cf46b9a0 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -731,15 +731,16 @@ 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);
 	clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
 	reset_control_assert(dwc->reset);
 }
@@ -1662,16 +1663,16 @@ 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

[PATCH stable-5.15 2/3] usb: dwc3: qcom: fix use-after-free on runtime-PM wakeup

[Johan Hovold]

From: Johan Hovold <johan+linaro@kernel.org>

commit  a872ab303d5ddd4c965f9cd868677781a33ce35a upstream.

The Qualcomm dwc3 runtime-PM implementation checks the xhci
platform-device pointer in the wakeup-interrupt handler to determine
whether the controller is in host mode and if so triggers a resume.

After a role switch in OTG mode the xhci platform-device would have been
freed and the next wakeup from runtime suspend would access the freed
memory.

Note that role switching is executed from a freezable workqueue, which
guarantees that the pointer is stable during suspend.

Also note that runtime PM has been broken since commit 2664deb09306
("usb: dwc3: qcom: Honor wakeup enabled/disabled state"), which
incidentally also prevents this issue from being triggered.

Fixes: a4333c3a6ba9 ("usb: dwc3: Add Qualcomm DWC3 glue driver")
Cc: stable@vger.kernel.org      # 4.18
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220804151001.23612-5-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ johan: adjust context for 5.15 ]
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 drivers/usb/dwc3/dwc3-qcom.c | 14 +++++++++++++-
 drivers/usb/dwc3/host.c      |  1 +
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 873bf5041117..d0352daab012 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -296,6 +296,14 @@ static void dwc3_qcom_interconnect_exit(struct dwc3_qcom *qcom)
 	icc_put(qcom->icc_path_apps);
 }
 
+/* Only usable in contexts where the role can not change. */
+static bool dwc3_qcom_is_host(struct dwc3_qcom *qcom)
+{
+	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
+
+	return dwc->xhci;
+}
+
 static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
 {
 	if (qcom->hs_phy_irq) {
@@ -411,7 +419,11 @@ static irqreturn_t qcom_dwc3_resume_irq(int irq, void *data)
 	if (qcom->pm_suspended)
 		return IRQ_HANDLED;
 
-	if (dwc->xhci)
+	/*
+	 * This is safe as role switching is done from a freezable workqueue
+	 * and the wakeup interrupts are disabled as part of resume.
+	 */
+	if (dwc3_qcom_is_host(qcom))
 		pm_runtime_resume(&dwc->xhci->dev);
 
 	return IRQ_HANDLED;
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index f29a264635aa..2078e9d70292 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -130,4 +130,5 @@ int dwc3_host_init(struct dwc3 *dwc)
 void dwc3_host_exit(struct dwc3 *dwc)
 {
 	platform_device_unregister(dwc->xhci);
+	dwc->xhci = NULL;
 }
-- 
2.35.1

[PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Johan Hovold]

From: Johan Hovold <johan+linaro@kernel.org>

commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.

The dwc3 driver manages its PHYs itself so the USB core PHY management
needs to be disabled.

Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
host: xhci-plat: add platform data support") and f768e718911e ("usb:
host: xhci-plat: add priv quirk for skip PHY initialization") to
propagate the setting for now.

Fixes: 4e88d4c08301 ("usb: add a flag to skip PHY initialization to struct usb_hcd")
Fixes: 178a0bce05cb ("usb: core: hcd: integrate the PHY wrapper into the HCD core")
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Cc: stable <stable@kernel.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220825131836.19769-1-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ johan: adjust context to 5.15 ]
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 drivers/usb/dwc3/host.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index 2078e9d70292..85165a972076 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -10,8 +10,13 @@
 #include <linux/acpi.h>
 #include <linux/platform_device.h>
 
+#include "../host/xhci-plat.h"
 #include "core.h"
 
+static const struct xhci_plat_priv dwc3_xhci_plat_priv = {
+	.quirks = XHCI_SKIP_PHY_INIT,
+};
+
 static int dwc3_host_get_irq(struct dwc3 *dwc)
 {
 	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
@@ -87,6 +92,11 @@ int dwc3_host_init(struct dwc3 *dwc)
 		goto err;
 	}
 
+	ret = platform_device_add_data(xhci, &dwc3_xhci_plat_priv,
+					sizeof(dwc3_xhci_plat_priv));
+	if (ret)
+		goto err;
+
 	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
 
 	if (dwc->usb3_lpm_capable)
-- 
2.35.1

Re: [PATCH stable-5.15 2/3] usb: dwc3: qcom: fix use-after-free on runtime-PM wakeup

[Greg Kroah-Hartman]

On Tue, Sep 06, 2022 at 02:07:01PM +0200, Johan Hovold wrote:
> From: Johan Hovold <johan+linaro@kernel.org>
> 
> commit  a872ab303d5ddd4c965f9cd868677781a33ce35a upstream.
> 
> The Qualcomm dwc3 runtime-PM implementation checks the xhci
> platform-device pointer in the wakeup-interrupt handler to determine
> whether the controller is in host mode and if so triggers a resume.
> 
> After a role switch in OTG mode the xhci platform-device would have been
> freed and the next wakeup from runtime suspend would access the freed
> memory.
> 
> Note that role switching is executed from a freezable workqueue, which
> guarantees that the pointer is stable during suspend.
> 
> Also note that runtime PM has been broken since commit 2664deb09306
> ("usb: dwc3: qcom: Honor wakeup enabled/disabled state"), which
> incidentally also prevents this issue from being triggered.
> 
> Fixes: a4333c3a6ba9 ("usb: dwc3: Add Qualcomm DWC3 glue driver")
> Cc: stable@vger.kernel.org      # 4.18
> Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> Link: https://lore.kernel.org/r/20220804151001.23612-5-johan+linaro@kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> [ johan: adjust context for 5.15 ]
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 14 +++++++++++++-
>  drivers/usb/dwc3/host.c      |  1 +
>  2 files changed, 14 insertions(+), 1 deletion(-)

This one did not apply to 5.4.y or 4.19.y :(

Re: [PATCH stable-5.15 1/3] usb: dwc3: fix PHY disable sequence

[Greg Kroah-Hartman]

On Tue, Sep 06, 2022 at 02:07:00PM +0200, Johan Hovold wrote:
> From: Johan Hovold <johan+linaro@kernel.org>
> 
> 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@vger.kernel.org      # 4.8
> Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
> Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> Link: https://lore.kernel.org/r/20220804151001.23612-2-johan+linaro@kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> [ johan: adjust context to 5.15 ]
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
>  drivers/usb/dwc3/core.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)

This one did not apply to 4.9.y, 4.14.y, or 4.19.y :(

Re: usb: dwc3: disable USB core PHY management

[Greg Kroah-Hartman]

On Tue, Sep 06, 2022 at 02:07:02PM +0200, Johan Hovold wrote:
> From: Johan Hovold <johan+linaro@kernel.org>
> 
> commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.
> 
> The dwc3 driver manages its PHYs itself so the USB core PHY management
> needs to be disabled.
> 
> Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
> host: xhci-plat: add platform data support") and f768e718911e ("usb:
> host: xhci-plat: add priv quirk for skip PHY initialization") to
> propagate the setting for now.
> 
> Fixes: 4e88d4c08301 ("usb: add a flag to skip PHY initialization to struct usb_hcd")
> Fixes: 178a0bce05cb ("usb: core: hcd: integrate the PHY wrapper into the HCD core")
> Tested-by: Matthias Kaehlcke <mka@chromium.org>
> Cc: stable <stable@kernel.org>
> Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> Link: https://lore.kernel.org/r/20220825131836.19769-1-johan+linaro@kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> [ johan: adjust context to 5.15 ]
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/usb/dwc3/host.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)

Breaks the build on 4.19.y :(

Re: [PATCH stable-5.15 1/3] usb: dwc3: fix PHY disable sequence

[Johan Hovold]

On Tue, Sep 06, 2022 at 02:16:24PM +0200, Greg Kroah-Hartman wrote:
> On Tue, Sep 06, 2022 at 02:07:00PM +0200, Johan Hovold wrote:
> > From: Johan Hovold <johan+linaro@kernel.org>
> > 
> > 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@vger.kernel.org      # 4.8
> > Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
> > Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> > Link: https://lore.kernel.org/r/20220804151001.23612-2-johan+linaro@kernel.org
> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > [ johan: adjust context to 5.15 ]
> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> > ---
> >  drivers/usb/dwc3/core.c | 19 ++++++++++---------
> >  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> This one did not apply to 4.9.y, 4.14.y, or 4.19.y :(

Perhaps someone who cares about these old trees can do the backports.
Should be as trivial. Can't be the patch submitters responsibility to
maintain 8 stable trees.

Johan

Re: usb: dwc3: disable USB core PHY management

[Johan Hovold]

On Tue, Sep 06, 2022 at 02:18:08PM +0200, Greg Kroah-Hartman wrote:
> On Tue, Sep 06, 2022 at 02:07:02PM +0200, Johan Hovold wrote:
> > From: Johan Hovold <johan+linaro@kernel.org>
> > 
> > commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.
> > 
> > The dwc3 driver manages its PHYs itself so the USB core PHY management
> > needs to be disabled.
> > 
> > Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
> > host: xhci-plat: add platform data support") and f768e718911e ("usb:
> > host: xhci-plat: add priv quirk for skip PHY initialization") to
> > propagate the setting for now.
> > 
> > Fixes: 4e88d4c08301 ("usb: add a flag to skip PHY initialization to struct usb_hcd")
> > Fixes: 178a0bce05cb ("usb: core: hcd: integrate the PHY wrapper into the HCD core")
> > Tested-by: Matthias Kaehlcke <mka@chromium.org>
> > Cc: stable <stable@kernel.org>
> > Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> > Link: https://lore.kernel.org/r/20220825131836.19769-1-johan+linaro@kernel.org
> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > [ johan: adjust context to 5.15 ]
> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > ---
> >  drivers/usb/dwc3/host.c |   10 ++++++++++
> >  1 file changed, 10 insertions(+)
> 
> Breaks the build on 4.19.y :(

It's OK to not to backport this one.

Johan

Re: [PATCH stable-5.15 1/3] usb: dwc3: fix PHY disable sequence

[Greg Kroah-Hartman]

On Tue, Sep 06, 2022 at 02:25:25PM +0200, Johan Hovold wrote:
> On Tue, Sep 06, 2022 at 02:16:24PM +0200, Greg Kroah-Hartman wrote:
> > On Tue, Sep 06, 2022 at 02:07:00PM +0200, Johan Hovold wrote:
> > > From: Johan Hovold <johan+linaro@kernel.org>
> > > 
> > > 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@vger.kernel.org      # 4.8
> > > Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
> > > Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
> > > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> > > Link: https://lore.kernel.org/r/20220804151001.23612-2-johan+linaro@kernel.org
> > > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > > [ johan: adjust context to 5.15 ]
> > > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> > > ---
> > >  drivers/usb/dwc3/core.c | 19 ++++++++++---------
> > >  1 file changed, 10 insertions(+), 9 deletions(-)
> > 
> > This one did not apply to 4.9.y, 4.14.y, or 4.19.y :(
> 
> Perhaps someone who cares about these old trees can do the backports.
> Should be as trivial. Can't be the patch submitters responsibility to
> maintain 8 stable trees.

I agree!  :)

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Stefan Agner]

Hi Johan,

On 2022-09-06 14:07, Johan Hovold wrote:
> From: Johan Hovold <johan+linaro@kernel.org>
> 
> commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.
> 
> The dwc3 driver manages its PHYs itself so the USB core PHY management
> needs to be disabled.
> 
> Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
> host: xhci-plat: add platform data support") and f768e718911e ("usb:
> host: xhci-plat: add priv quirk for skip PHY initialization") to
> propagate the setting for now.

[adding also Samsung/ODROID device tree authors Krzysztof and Marek]

For some reason, this commit seems to break detection of the USB to
S-ATA controller on ODROID-HC1 devices (Exynos 5422).

We have a known to work OS release of v5.15.60, and known to not be
working of v5.15.67. By reverting suspicious commits, I was able to
pinpoint the problem to this particular commit.

From what I understand, on that particular hardware the S-ATA controller
power is controlled via the V-BUS signal VBUSCTRL_U2 (Schematic [1]).
Presumably this signal is no longer controlled with this change.

This came up in our HAOS issue #2153 [2].

--
Stefan

[1]
https://dn.odroid.com/5422/ODROID-HC1_MC1/Schematics/HC1_MAIN_REV0.1_20170630.pdf
[2] https://github.com/home-assistant/operating-system/issues/2153

> 
> Fixes: 4e88d4c08301 ("usb: add a flag to skip PHY initialization to
> struct usb_hcd")
> Fixes: 178a0bce05cb ("usb: core: hcd: integrate the PHY wrapper into
> the HCD core")
> Tested-by: Matthias Kaehlcke <mka@chromium.org>
> Cc: stable <stable@kernel.org>
> Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> Link: https://lore.kernel.org/r/20220825131836.19769-1-johan+linaro@kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> [ johan: adjust context to 5.15 ]
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
>  drivers/usb/dwc3/host.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index 2078e9d70292..85165a972076 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -10,8 +10,13 @@
>  #include <linux/acpi.h>
>  #include <linux/platform_device.h>
>  
> +#include "../host/xhci-plat.h"
>  #include "core.h"
>  
> +static const struct xhci_plat_priv dwc3_xhci_plat_priv = {
> +	.quirks = XHCI_SKIP_PHY_INIT,
> +};
> +
>  static int dwc3_host_get_irq(struct dwc3 *dwc)
>  {
>  	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
> @@ -87,6 +92,11 @@ int dwc3_host_init(struct dwc3 *dwc)
>  		goto err;
>  	}
>  
> +	ret = platform_device_add_data(xhci, &dwc3_xhci_plat_priv,
> +					sizeof(dwc3_xhci_plat_priv));
> +	if (ret)
> +		goto err;
> +
>  	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
>  
>  	if (dwc->usb3_lpm_capable)

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Johan Hovold]

On Tue, Oct 18, 2022 at 05:27:24PM +0200, Stefan Agner wrote:
> Hi Johan,
> 
> On 2022-09-06 14:07, Johan Hovold wrote:
> > From: Johan Hovold <johan+linaro@kernel.org>
> > 
> > commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.
> > 
> > The dwc3 driver manages its PHYs itself so the USB core PHY management
> > needs to be disabled.
> > 
> > Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
> > host: xhci-plat: add platform data support") and f768e718911e ("usb:
> > host: xhci-plat: add priv quirk for skip PHY initialization") to
> > propagate the setting for now.
> 
> [adding also Samsung/ODROID device tree authors Krzysztof and Marek]
> 
> For some reason, this commit seems to break detection of the USB to
> S-ATA controller on ODROID-HC1 devices (Exynos 5422).
> 
> We have a known to work OS release of v5.15.60, and known to not be
> working of v5.15.67. By reverting suspicious commits, I was able to
> pinpoint the problem to this particular commit.
> 
> From what I understand, on that particular hardware the S-ATA controller
> power is controlled via the V-BUS signal VBUSCTRL_U2 (Schematic [1]).
> Presumably this signal is no longer controlled with this change.
> 
> This came up in our HAOS issue #2153 [2].

Thanks for the report and sorry about the breakage. This wasn't supposed
to go to stable but Greg thought otherwise (and I helped with the
backporting to prevent autosel from pulling in even more changes).

But at least this way we found out sooner that this platform depends on
having both USB core and dwc3 managing the same PHY.

I think this may be related to the calibration calls added to dwc3 and
later removed again by commits:

	d8c80bb3b55b ("phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800")
	a0a465569b45 ("usb: dwc3: remove generic PHY calibrate() calls")

The removal explicitly mentions that the expectation is that USB core
will do the PHY calibration.

There could be other changes in the sequencing of events that this
platform has been implicitly relying on, but as a start, could try
adding the missing calibration calls (patch below) and see if that makes a
difference?

Johan


diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 46cf8edf7f93..f8a0e340eb63 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -198,6 +198,8 @@ static void __dwc3_set_mode(struct work_struct *work)
                                otg_set_vbus(dwc->usb2_phy->otg, true);
                        phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
                        phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
+                       phy_calibrate(dwc->usb2_generic_phy);
+                       phy_calibrate(dwc->usb3_generic_phy);
                        if (dwc->dis_split_quirk) {
                                reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
                                reg |= DWC3_GUCTL3_SPLITDISABLE;
@@ -1369,6 +1371,8 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
                        otg_set_vbus(dwc->usb2_phy->otg, true);
                phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
                phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
+               phy_calibrate(dwc->usb2_generic_phy);
+               phy_calibrate(dwc->usb3_generic_phy);
 
                ret = dwc3_host_init(dwc);
                if (ret)

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Stefan Agner]

Hi Johan,

On 2022-10-19 10:59, Johan Hovold wrote:
> On Tue, Oct 18, 2022 at 05:27:24PM +0200, Stefan Agner wrote:
>> Hi Johan,
>>
>> On 2022-09-06 14:07, Johan Hovold wrote:
>> > From: Johan Hovold <johan+linaro@kernel.org>
>> >
>> > commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.
>> >
>> > The dwc3 driver manages its PHYs itself so the USB core PHY management
>> > needs to be disabled.
>> >
>> > Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
>> > host: xhci-plat: add platform data support") and f768e718911e ("usb:
>> > host: xhci-plat: add priv quirk for skip PHY initialization") to
>> > propagate the setting for now.
>>
>> [adding also Samsung/ODROID device tree authors Krzysztof and Marek]
>>
>> For some reason, this commit seems to break detection of the USB to
>> S-ATA controller on ODROID-HC1 devices (Exynos 5422).
>>
>> We have a known to work OS release of v5.15.60, and known to not be
>> working of v5.15.67. By reverting suspicious commits, I was able to
>> pinpoint the problem to this particular commit.
>>
>> From what I understand, on that particular hardware the S-ATA controller
>> power is controlled via the V-BUS signal VBUSCTRL_U2 (Schematic [1]).
>> Presumably this signal is no longer controlled with this change.
>>
>> This came up in our HAOS issue #2153 [2].
> 
> Thanks for the report and sorry about the breakage. This wasn't supposed
> to go to stable but Greg thought otherwise (and I helped with the
> backporting to prevent autosel from pulling in even more changes).
> 
> But at least this way we found out sooner that this platform depends on
> having both USB core and dwc3 managing the same PHY.
> 
> I think this may be related to the calibration calls added to dwc3 and
> later removed again by commits:
> 
> 	d8c80bb3b55b ("phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800")
> 	a0a465569b45 ("usb: dwc3: remove generic PHY calibrate() calls")
> 
> The removal explicitly mentions that the expectation is that USB core
> will do the PHY calibration.
> 
> There could be other changes in the sequencing of events that this
> platform has been implicitly relying on, but as a start, could try
> adding the missing calibration calls (patch below) and see if that makes a
> difference?

The patch below did not apply to 5.15.74 directly, but I think I was
able to get the corrected patch applied (see below)

That said, I do not have direct access to that hardware, but I created a
build and asked the user test it.

Best regards,
Stefan

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c32ca691bcc7..964f512603ec 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -196,6 +196,8 @@ static void __dwc3_set_mode(struct work_struct
*work)
                                otg_set_vbus(dwc->usb2_phy->otg, true);
                        phy_set_mode(dwc->usb2_generic_phy,
PHY_MODE_USB_HOST);
                        phy_set_mode(dwc->usb3_generic_phy,
PHY_MODE_USB_HOST);
+                       phy_calibrate(dwc->usb2_generic_phy);
+                       phy_calibrate(dwc->usb3_generic_phy);
                        if (dwc->dis_split_quirk) {
                                reg = dwc3_readl(dwc->regs,
DWC3_GUCTL3);
                                reg |= DWC3_GUCTL3_SPLITDISABLE;
@@ -1227,6 +1229,8 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
                        otg_set_vbus(dwc->usb2_phy->otg, true);
                phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
                phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
+               phy_calibrate(dwc->usb2_generic_phy);
+               phy_calibrate(dwc->usb3_generic_phy);
 
                ret = dwc3_host_init(dwc);
                if (ret)



--
Stefan

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Johan Hovold]

On Fri, Oct 21, 2022 at 12:06:12AM +0200, Stefan Agner wrote:
> On 2022-10-19 10:59, Johan Hovold wrote:
> > On Tue, Oct 18, 2022 at 05:27:24PM +0200, Stefan Agner wrote:
> >> On 2022-09-06 14:07, Johan Hovold wrote:
> >> > From: Johan Hovold <johan+linaro@kernel.org>
> >> >
> >> > commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.
> >> >
> >> > The dwc3 driver manages its PHYs itself so the USB core PHY management
> >> > needs to be disabled.
> >> >
> >> > Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
> >> > host: xhci-plat: add platform data support") and f768e718911e ("usb:
> >> > host: xhci-plat: add priv quirk for skip PHY initialization") to
> >> > propagate the setting for now.

> >> For some reason, this commit seems to break detection of the USB to
> >> S-ATA controller on ODROID-HC1 devices (Exynos 5422).

> > I think this may be related to the calibration calls added to dwc3 and
> > later removed again by commits:
> > 
> > 	d8c80bb3b55b ("phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800")
> > 	a0a465569b45 ("usb: dwc3: remove generic PHY calibrate() calls")
> > 
> > The removal explicitly mentions that the expectation is that USB core
> > will do the PHY calibration.
> > 
> > There could be other changes in the sequencing of events that this
> > platform has been implicitly relying on, but as a start, could try
> > adding the missing calibration calls (patch below) and see if that makes a
> > difference?
> 
> The patch below did not apply to 5.15.74 directly, but I think I was
> able to get the corrected patch applied (see below)

Looks good to me.

> That said, I do not have direct access to that hardware, but I created a
> build and asked the user test it.

Thanks, let me know how it goes.

Johan

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Stefan Agner]

On 2022-10-21 08:54, Johan Hovold wrote:
> On Fri, Oct 21, 2022 at 12:06:12AM +0200, Stefan Agner wrote:
>> On 2022-10-19 10:59, Johan Hovold wrote:
>> > On Tue, Oct 18, 2022 at 05:27:24PM +0200, Stefan Agner wrote:
>> >> On 2022-09-06 14:07, Johan Hovold wrote:
>> >> > From: Johan Hovold <johan+linaro@kernel.org>
>> >> >
>> >> > commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.
>> >> >
>> >> > The dwc3 driver manages its PHYs itself so the USB core PHY management
>> >> > needs to be disabled.
>> >> >
>> >> > Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
>> >> > host: xhci-plat: add platform data support") and f768e718911e ("usb:
>> >> > host: xhci-plat: add priv quirk for skip PHY initialization") to
>> >> > propagate the setting for now.
> 
>> >> For some reason, this commit seems to break detection of the USB to
>> >> S-ATA controller on ODROID-HC1 devices (Exynos 5422).
> 
>> > I think this may be related to the calibration calls added to dwc3 and
>> > later removed again by commits:
>> >
>> > 	d8c80bb3b55b ("phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800")
>> > 	a0a465569b45 ("usb: dwc3: remove generic PHY calibrate() calls")
>> >
>> > The removal explicitly mentions that the expectation is that USB core
>> > will do the PHY calibration.
>> >
>> > There could be other changes in the sequencing of events that this
>> > platform has been implicitly relying on, but as a start, could try
>> > adding the missing calibration calls (patch below) and see if that makes a
>> > difference?
>> 
>> The patch below did not apply to 5.15.74 directly, but I think I was
>> able to get the corrected patch applied (see below)
> 
> Looks good to me.
> 
>> That said, I do not have direct access to that hardware, but I created a
>> build and asked the user test it.
> 
> Thanks, let me know how it goes.

The user reports the S-ATA disk is *not* recognized with that patch
applied.

--
Stefan

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Johan Hovold]

On Wed, Oct 26, 2022 at 03:11:00PM +0200, Stefan Agner wrote:
> On 2022-10-21 08:54, Johan Hovold wrote:
> > On Fri, Oct 21, 2022 at 12:06:12AM +0200, Stefan Agner wrote:
> >> On 2022-10-19 10:59, Johan Hovold wrote:
> >> > On Tue, Oct 18, 2022 at 05:27:24PM +0200, Stefan Agner wrote:
> >> >> On 2022-09-06 14:07, Johan Hovold wrote:
> >> >> > From: Johan Hovold <johan+linaro@kernel.org>
> >> >> >
> >> >> > commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.
> >> >> >
> >> >> > The dwc3 driver manages its PHYs itself so the USB core PHY management
> >> >> > needs to be disabled.
> >> >> >
> >> >> > Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
> >> >> > host: xhci-plat: add platform data support") and f768e718911e ("usb:
> >> >> > host: xhci-plat: add priv quirk for skip PHY initialization") to
> >> >> > propagate the setting for now.
> > 
> >> >> For some reason, this commit seems to break detection of the USB to
> >> >> S-ATA controller on ODROID-HC1 devices (Exynos 5422).
> > 
> >> > I think this may be related to the calibration calls added to dwc3 and
> >> > later removed again by commits:
> >> >
> >> > 	d8c80bb3b55b ("phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800")
> >> > 	a0a465569b45 ("usb: dwc3: remove generic PHY calibrate() calls")
> >> >
> >> > The removal explicitly mentions that the expectation is that USB core
> >> > will do the PHY calibration.
> >> >
> >> > There could be other changes in the sequencing of events that this
> >> > platform has been implicitly relying on, but as a start, could try
> >> > adding the missing calibration calls (patch below) and see if that makes a
> >> > difference?
> >> 
> >> The patch below did not apply to 5.15.74 directly, but I think I was
> >> able to get the corrected patch applied (see below)

> The user reports the S-ATA disk is *not* recognized with that patch
> applied.

I just noticed a mistake in the instrumentation patch I sent you. Could
you try moving the calibrations calls after dwc3_host_init() (e.g. as in
the second chunk in the diff below)?

As mentioned in the commit message for a0a465569b45 ("usb: dwc3: remove
generic PHY calibrate() calls"), this may not work if the xhci-plat
driver is built as a module and there are some corner cases that it does
not cover.

It seems we should revert the offending commit and then try to find some
time to untangle this mess, but please check if the below addresses the
issue first so we know what the problem is.

I'll prepare a revert in the meantime.

Johan


diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 31156d4dec9f..37d49a394912 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -197,6 +197,8 @@ static void __dwc3_set_mode(struct work_struct *work)
                                otg_set_vbus(dwc->usb2_phy->otg, true);
                        phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
                        phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
+                       phy_calibrate(dwc->usb2_generic_phy);
+                       phy_calibrate(dwc->usb3_generic_phy);
                        if (dwc->dis_split_quirk) {
                                reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
                                reg |= DWC3_GUCTL3_SPLITDISABLE;
@@ -1391,6 +1393,9 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
                ret = dwc3_host_init(dwc);
                if (ret)
                        return dev_err_probe(dev, ret, "failed to initialize host\n");
+
+               phy_calibrate(dwc->usb2_generic_phy);
+               phy_calibrate(dwc->usb3_generic_phy);
                break;
        case USB_DR_MODE_OTG:
                INIT_WORK(&dwc->drd_work, __dwc3_set_mode);

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Marek Szyprowski]

Dear All,

On 18.10.2022 17:27, Stefan Agner wrote:
> Hi Johan,
>
> On 2022-09-06 14:07, Johan Hovold wrote:
>> From: Johan Hovold <johan+linaro@kernel.org>
>>
>> commit 6000b8d900cd5f52fbcd0776d0cc396e88c8c2ea upstream.
>>
>> The dwc3 driver manages its PHYs itself so the USB core PHY management
>> needs to be disabled.
>>
>> Use the struct xhci_plat_priv hack added by commits 46034a999c07 ("usb:
>> host: xhci-plat: add platform data support") and f768e718911e ("usb:
>> host: xhci-plat: add priv quirk for skip PHY initialization") to
>> propagate the setting for now.
> [adding also Samsung/ODROID device tree authors Krzysztof and Marek]
>
> For some reason, this commit seems to break detection of the USB to
> S-ATA controller on ODROID-HC1 devices (Exynos 5422).
>
> We have a known to work OS release of v5.15.60, and known to not be
> working of v5.15.67. By reverting suspicious commits, I was able to
> pinpoint the problem to this particular commit.
>
> >From what I understand, on that particular hardware the S-ATA controller
> power is controlled via the V-BUS signal VBUSCTRL_U2 (Schematic [1]).
> Presumably this signal is no longer controlled with this change.
>
> This came up in our HAOS issue #2153 [2].

I confirm this issue and I've managed to reproduce it locally. The 
mainline is also affected. I will try to prepare a proper patch soon.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Johan Hovold]

On Thu, Oct 27, 2022 at 02:45:15PM +0200, Johan Hovold wrote:
> On Wed, Oct 26, 2022 at 03:11:00PM +0200, Stefan Agner wrote:

> > The user reports the S-ATA disk is *not* recognized with that patch
> > applied.
> 
> I just noticed a mistake in the instrumentation patch I sent you. Could
> you try moving the calibrations calls after dwc3_host_init() (e.g. as in
> the second chunk in the diff below)?
> 
> As mentioned in the commit message for a0a465569b45 ("usb: dwc3: remove
> generic PHY calibrate() calls"), this may not work if the xhci-plat
> driver is built as a module and there are some corner cases that it does
> not cover.
> 
> It seems we should revert the offending commit and then try to find some
> time to untangle this mess, but please check if the below addresses the
> issue first so we know what the problem is.
> 
> I'll prepare a revert in the meantime.

I've now posted the revert, but please do check if the below patch was
enough to resolve the immediate issue.

Johan

> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 31156d4dec9f..37d49a394912 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -197,6 +197,8 @@ static void __dwc3_set_mode(struct work_struct *work)
>                                 otg_set_vbus(dwc->usb2_phy->otg, true);
>                         phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
>                         phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
> +                       phy_calibrate(dwc->usb2_generic_phy);
> +                       phy_calibrate(dwc->usb3_generic_phy);
>                         if (dwc->dis_split_quirk) {
>                                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
>                                 reg |= DWC3_GUCTL3_SPLITDISABLE;
> @@ -1391,6 +1393,9 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
>                 ret = dwc3_host_init(dwc);
>                 if (ret)
>                         return dev_err_probe(dev, ret, "failed to initialize host\n");
> +
> +               phy_calibrate(dwc->usb2_generic_phy);
> +               phy_calibrate(dwc->usb3_generic_phy);
>                 break;
>         case USB_DR_MODE_OTG:
>                 INIT_WORK(&dwc->drd_work, __dwc3_set_mode);

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Marek Szyprowski]

Hi Johan,

On 03.11.2022 15:49, Johan Hovold wrote:
> On Thu, Oct 27, 2022 at 02:45:15PM +0200, Johan Hovold wrote:
>> On Wed, Oct 26, 2022 at 03:11:00PM +0200, Stefan Agner wrote:
>>> The user reports the S-ATA disk is *not* recognized with that patch
>>> applied.
>> I just noticed a mistake in the instrumentation patch I sent you. Could
>> you try moving the calibrations calls after dwc3_host_init() (e.g. as in
>> the second chunk in the diff below)?
>>
>> As mentioned in the commit message for a0a465569b45 ("usb: dwc3: remove
>> generic PHY calibrate() calls"), this may not work if the xhci-plat
>> driver is built as a module and there are some corner cases that it does
>> not cover.
>>
>> It seems we should revert the offending commit and then try to find some
>> time to untangle this mess, but please check if the below addresses the
>> issue first so we know what the problem is.
>>
>> I'll prepare a revert in the meantime.
> I've now posted the revert, but please do check if the below patch was
> enough to resolve the immediate issue.

The below patch was a half-fix. It worked only if both dwc3 and 
xhci_plat_hcd were compiled into the kernel. Afair Debian-based distros 
used xhci compiled as a module, so this didn't work for that case due to 
timing issues.


>
> Johan
>
>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> index 31156d4dec9f..37d49a394912 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -197,6 +197,8 @@ static void __dwc3_set_mode(struct work_struct *work)
>>                                  otg_set_vbus(dwc->usb2_phy->otg, true);
>>                          phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
>>                          phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
>> +                       phy_calibrate(dwc->usb2_generic_phy);
>> +                       phy_calibrate(dwc->usb3_generic_phy);
>>                          if (dwc->dis_split_quirk) {
>>                                  reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
>>                                  reg |= DWC3_GUCTL3_SPLITDISABLE;
>> @@ -1391,6 +1393,9 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
>>                  ret = dwc3_host_init(dwc);
>>                  if (ret)
>>                          return dev_err_probe(dev, ret, "failed to initialize host\n");
>> +
>> +               phy_calibrate(dwc->usb2_generic_phy);
>> +               phy_calibrate(dwc->usb3_generic_phy);
>>                  break;
>>          case USB_DR_MODE_OTG:
>>                  INIT_WORK(&dwc->drd_work, __dwc3_set_mode);

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH stable-5.15 3/3] usb: dwc3: disable USB core PHY management

[Johan Hovold]

On Thu, Nov 03, 2022 at 04:18:12PM +0100, Marek Szyprowski wrote:
> Hi Johan,
> 
> On 03.11.2022 15:49, Johan Hovold wrote:
> > On Thu, Oct 27, 2022 at 02:45:15PM +0200, Johan Hovold wrote:
> >> On Wed, Oct 26, 2022 at 03:11:00PM +0200, Stefan Agner wrote:
> >>> The user reports the S-ATA disk is *not* recognized with that patch
> >>> applied.
> >> I just noticed a mistake in the instrumentation patch I sent you. Could
> >> you try moving the calibrations calls after dwc3_host_init() (e.g. as in
> >> the second chunk in the diff below)?
> >>
> >> As mentioned in the commit message for a0a465569b45 ("usb: dwc3: remove
> >> generic PHY calibrate() calls"), this may not work if the xhci-plat
> >> driver is built as a module and there are some corner cases that it does
> >> not cover.
> >>
> >> It seems we should revert the offending commit and then try to find some
> >> time to untangle this mess, but please check if the below addresses the
> >> issue first so we know what the problem is.
> >>
> >> I'll prepare a revert in the meantime.
> > I've now posted the revert, but please do check if the below patch was
> > enough to resolve the immediate issue.
> 
> The below patch was a half-fix. It worked only if both dwc3 and 
> xhci_plat_hcd were compiled into the kernel. Afair Debian-based distros 
> used xhci compiled as a module, so this didn't work for that case due to 
> timing issues.

Yeah, I mentioned that above too. The intention here was just to confirm
the hypothesis that the regression was due to the missing calibration
calls.

Johan