Currently for dwc3_usb31 controller, if maximum_speed is limited to
super-speed in DT, then device mode is limited to SS, but host mode
still works in SSP.
The documentation for max-speed property is as follows:
"Tells USB controllers we want to work up to a certain speed.
Incase this isn't passed via DT, USB controllers should default to
their maximum HW capability."
It doesn't specify that the property is only for device mode.
There are cases where we need to limit the host's maximum speed to
SuperSpeed only. Use this property for host mode to contrain host's
speed to SuperSpeed.
Signed-off-by: Krishna Kurapati <[email protected]>
---
Link to v1: https://lore.kernel.org/all/[email protected]/
Discussion regarding the same at:
https://lore.kernel.org/all/[email protected]/
drivers/usb/dwc3/core.c | 8 ++++++++
drivers/usb/dwc3/core.h | 5 +++++
2 files changed, 13 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 278cd1c33841..33bc72595e74 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1262,6 +1262,14 @@ static int dwc3_core_init(struct dwc3 *dwc)
}
}
+ if ((hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) &&
+ (DWC3_IP_IS(DWC31)) &&
+ (dwc->maximum_speed == USB_SPEED_SUPER)) {
+ reg = dwc3_readl(dwc->regs, DWC3_LLUCTL);
+ reg |= DWC3_LLUCTL_FORCE_GEN1;
+ dwc3_writel(dwc->regs, DWC3_LLUCTL, reg);
+ }
+
return 0;
err_power_off_phy:
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 1968638f29ed..5a251da309d4 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -172,6 +172,8 @@
#define DWC3_OEVTEN 0xcc0C
#define DWC3_OSTS 0xcc10
+#define DWC3_LLUCTL 0xd024
+
/* Bit fields */
/* Global SoC Bus Configuration INCRx Register 0 */
@@ -655,6 +657,9 @@
#define DWC3_OSTS_VBUSVLD BIT(1)
#define DWC3_OSTS_CONIDSTS BIT(0)
+/* Force Gen1 speed on Gen2 link */
+#define DWC3_LLUCTL_FORCE_GEN1 BIT(10)
+
/* Structures */
struct dwc3_trb;
--
2.40.0
On Sun, May 14, 2023, Krishna Kurapati wrote:
> Currently for dwc3_usb31 controller, if maximum_speed is limited to
> super-speed in DT, then device mode is limited to SS, but host mode
> still works in SSP.
>
> The documentation for max-speed property is as follows:
>
> "Tells USB controllers we want to work up to a certain speed.
> Incase this isn't passed via DT, USB controllers should default to
> their maximum HW capability."
>
> It doesn't specify that the property is only for device mode.
> There are cases where we need to limit the host's maximum speed to
> SuperSpeed only. Use this property for host mode to contrain host's
> speed to SuperSpeed.
>
> Signed-off-by: Krishna Kurapati <[email protected]>
> ---
> Link to v1: https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCAhqfAZ0Q$
>
> Discussion regarding the same at:
> https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCDRLUrJWg$
>
> drivers/usb/dwc3/core.c | 8 ++++++++
> drivers/usb/dwc3/core.h | 5 +++++
> 2 files changed, 13 insertions(+)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 278cd1c33841..33bc72595e74 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1262,6 +1262,14 @@ static int dwc3_core_init(struct dwc3 *dwc)
> }
> }
>
> + if ((hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) &&
> + (DWC3_IP_IS(DWC31)) &&
> + (dwc->maximum_speed == USB_SPEED_SUPER)) {
> + reg = dwc3_readl(dwc->regs, DWC3_LLUCTL);
> + reg |= DWC3_LLUCTL_FORCE_GEN1;
> + dwc3_writel(dwc->regs, DWC3_LLUCTL, reg);
> + }
> +
Perhaps this should be done for every usb3 port rather than just the
port_0. This patch can go after your multi-port series is added to
Greg's branch where you can check for number of usb3 ports.
Thanks,
Thinh
> return 0;
>
> err_power_off_phy:
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 1968638f29ed..5a251da309d4 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -172,6 +172,8 @@
> #define DWC3_OEVTEN 0xcc0C
> #define DWC3_OSTS 0xcc10
>
> +#define DWC3_LLUCTL 0xd024
> +
> /* Bit fields */
>
> /* Global SoC Bus Configuration INCRx Register 0 */
> @@ -655,6 +657,9 @@
> #define DWC3_OSTS_VBUSVLD BIT(1)
> #define DWC3_OSTS_CONIDSTS BIT(0)
>
> +/* Force Gen1 speed on Gen2 link */
> +#define DWC3_LLUCTL_FORCE_GEN1 BIT(10)
> +
> /* Structures */
>
> struct dwc3_trb;
> --
> 2.40.0
>
On Wed, May 17, 2023, Thinh Nguyen wrote:
> On Sun, May 14, 2023, Krishna Kurapati wrote:
> > Currently for dwc3_usb31 controller, if maximum_speed is limited to
> > super-speed in DT, then device mode is limited to SS, but host mode
> > still works in SSP.
> >
> > The documentation for max-speed property is as follows:
> >
> > "Tells USB controllers we want to work up to a certain speed.
> > Incase this isn't passed via DT, USB controllers should default to
> > their maximum HW capability."
> >
> > It doesn't specify that the property is only for device mode.
> > There are cases where we need to limit the host's maximum speed to
> > SuperSpeed only. Use this property for host mode to contrain host's
> > speed to SuperSpeed.
> >
> > Signed-off-by: Krishna Kurapati <[email protected]>
> > ---
> > Link to v1: https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCAhqfAZ0Q$
> >
> > Discussion regarding the same at:
> > https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCDRLUrJWg$
> >
> > drivers/usb/dwc3/core.c | 8 ++++++++
> > drivers/usb/dwc3/core.h | 5 +++++
> > 2 files changed, 13 insertions(+)
> >
> > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > index 278cd1c33841..33bc72595e74 100644
> > --- a/drivers/usb/dwc3/core.c
> > +++ b/drivers/usb/dwc3/core.c
> > @@ -1262,6 +1262,14 @@ static int dwc3_core_init(struct dwc3 *dwc)
> > }
> > }
> >
> > + if ((hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) &&
> > + (DWC3_IP_IS(DWC31)) &&
> > + (dwc->maximum_speed == USB_SPEED_SUPER)) {
> > + reg = dwc3_readl(dwc->regs, DWC3_LLUCTL);
> > + reg |= DWC3_LLUCTL_FORCE_GEN1;
> > + dwc3_writel(dwc->regs, DWC3_LLUCTL, reg);
> > + }
> > +
>
> Perhaps this should be done for every usb3 port rather than just the
> port_0. This patch can go after your multi-port series is added to
> Greg's branch where you can check for number of usb3 ports.
>
Can you also add dwc_usb32 settings? It should look something like this:
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 0beaab932e7d..4bd2564aa163 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1262,6 +1262,40 @@ static int dwc3_core_init(struct dwc3 *dwc)
}
}
+ if (hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) {
+ int i;
+
+ if (DWC3_IP_IS(DWC31) &&
+ dwc->maximum_speed == USB_SPEED_SUPER) {
+ for (i = 0; i < dwc->num_usb3_ports; i++) {
+ reg = dwc3_readl(dwc->regs, DWC3_LLUCTL(i));
+ reg |= DWC3_LLUCTL_FORCE_GEN1;
+ dwc3_writel(dwc->regs, DWC3_LLUCTL(i), reg);
+ }
+ }
+
+ if (DWC3_IP_IS(DWC32) &&
+ dwc->max_ssp_rate != USB_SSP_GEN_2x2) {
+ int lsr_speed = -EINVAL;
+
+ if (dwc->maximum_speed == USB_SPEED_SUPER)
+ lsr_speed = DWC3_LCSR_GEN_1x1;
+ else if (dwc->max_ssp_rate == USB_SSP_GEN_2x1)
+ lsr_speed = DWC3_LCSR_GEN_2x1;
+ else if (dwc->max_ssp_rate == USB_SSP_GEN_1x2)
+ lsr_speed = DWC3_LCSR_GEN_1x2;
+
+ if (lsr_speed != -EINVAL) {
+ for (i = 0; i < dwc->num_usb3_ports; i++) {
+ reg = dwc3_readl(dwc->regs, DWC3_LCSR_USB32CTL(i));
+ reg &= ~DWC3_LCSR_USB32CTL_SPEED_MASK;
+ reg |= lsr_speed;
+ dwc3_writel(dwc->regs, DWC3_LCSR_USB32CTL(i), reg);
+ }
+ }
+ }
+ }
+
return 0;
err_power_off_phy:
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index d56457c02996..415e0215fe00 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -170,6 +170,9 @@
#define DWC3_OEVTEN 0xcc0C
#define DWC3_OSTS 0xcc10
+#define DWC3_LLUCTL(n) (0xd024 + ((n) * 0x80))
+#define DWC3_LCSR_USB32CTL(n) (0xd07c + ((n) * 0x80))
+
/* Bit fields */
/* Global SoC Bus Configuration INCRx Register 0 */
@@ -653,6 +656,16 @@
#define DWC3_OSTS_VBUSVLD BIT(1)
#define DWC3_OSTS_CONIDSTS BIT(0)
+/* LLUCTL Register */
+#define DWC3_LLUCTL_FORCE_GEN1 BIT(10)
+
+/* LCSR_USB32CTL Register */
+#define DWC3_LCSR_USB32CTL_SPEED_MASK 0x3
+#define DWC3_LCSR_GEN_1x1 0
+#define DWC3_LCSR_GEN_1x2 1
+#define DWC3_LCSR_GEN_2x1 2
+#define DWC3_LCSR_GEN_2x2 3
+
/* Structures */
struct dwc3_trb;
--
Thanks,
Thinh
On 5/17/2023 6:00 AM, Thinh Nguyen wrote:
> On Wed, May 17, 2023, Thinh Nguyen wrote:
>> On Sun, May 14, 2023, Krishna Kurapati wrote:
>>> Currently for dwc3_usb31 controller, if maximum_speed is limited to
>>> super-speed in DT, then device mode is limited to SS, but host mode
>>> still works in SSP.
>>>
>>> The documentation for max-speed property is as follows:
>>>
>>> "Tells USB controllers we want to work up to a certain speed.
>>> Incase this isn't passed via DT, USB controllers should default to
>>> their maximum HW capability."
>>>
>>> It doesn't specify that the property is only for device mode.
>>> There are cases where we need to limit the host's maximum speed to
>>> SuperSpeed only. Use this property for host mode to contrain host's
>>> speed to SuperSpeed.
>>>
>>> Signed-off-by: Krishna Kurapati <[email protected]>
>>> ---
>>> Link to v1: https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCAhqfAZ0Q$
>>>
>>> Discussion regarding the same at:
>>> https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCDRLUrJWg$
>>>
>>> drivers/usb/dwc3/core.c | 8 ++++++++
>>> drivers/usb/dwc3/core.h | 5 +++++
>>> 2 files changed, 13 insertions(+)
>>>
>>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>>> index 278cd1c33841..33bc72595e74 100644
>>> --- a/drivers/usb/dwc3/core.c
>>> +++ b/drivers/usb/dwc3/core.c
>>> @@ -1262,6 +1262,14 @@ static int dwc3_core_init(struct dwc3 *dwc)
>>> }
>>> }
>>>
>>> + if ((hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) &&
>>> + (DWC3_IP_IS(DWC31)) &&
>>> + (dwc->maximum_speed == USB_SPEED_SUPER)) {
>>> + reg = dwc3_readl(dwc->regs, DWC3_LLUCTL);
>>> + reg |= DWC3_LLUCTL_FORCE_GEN1;
>>> + dwc3_writel(dwc->regs, DWC3_LLUCTL, reg);
>>> + }
>>> +
>>
>> Perhaps this should be done for every usb3 port rather than just the
>> port_0. This patch can go after your multi-port series is added to
>> Greg's branch where you can check for number of usb3 ports.
>>
>
> Can you also add dwc_usb32 settings? It should look something like this:
>
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 0beaab932e7d..4bd2564aa163 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1262,6 +1262,40 @@ static int dwc3_core_init(struct dwc3 *dwc)
> }
> }
>
> + if (hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) {
> + int i;
> +
> + if (DWC3_IP_IS(DWC31) &&
> + dwc->maximum_speed == USB_SPEED_SUPER) {
> + for (i = 0; i < dwc->num_usb3_ports; i++) {
> + reg = dwc3_readl(dwc->regs, DWC3_LLUCTL(i));
> + reg |= DWC3_LLUCTL_FORCE_GEN1;
> + dwc3_writel(dwc->regs, DWC3_LLUCTL(i), reg);
> + }
> + }
> +
> + if (DWC3_IP_IS(DWC32) &&
> + dwc->max_ssp_rate != USB_SSP_GEN_2x2) {
> + int lsr_speed = -EINVAL;
> +
> + if (dwc->maximum_speed == USB_SPEED_SUPER)
> + lsr_speed = DWC3_LCSR_GEN_1x1;
> + else if (dwc->max_ssp_rate == USB_SSP_GEN_2x1)
> + lsr_speed = DWC3_LCSR_GEN_2x1;
> + else if (dwc->max_ssp_rate == USB_SSP_GEN_1x2)
> + lsr_speed = DWC3_LCSR_GEN_1x2;
> +
> + if (lsr_speed != -EINVAL) {
> + for (i = 0; i < dwc->num_usb3_ports; i++) {
> + reg = dwc3_readl(dwc->regs, DWC3_LCSR_USB32CTL(i));
> + reg &= ~DWC3_LCSR_USB32CTL_SPEED_MASK;
> + reg |= lsr_speed;
> + dwc3_writel(dwc->regs, DWC3_LCSR_USB32CTL(i), reg);
> + }
> + }
> + }
> + }
> +
> return 0;
>
> err_power_off_phy:
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index d56457c02996..415e0215fe00 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -170,6 +170,9 @@
> #define DWC3_OEVTEN 0xcc0C
> #define DWC3_OSTS 0xcc10
>
> +#define DWC3_LLUCTL(n) (0xd024 + ((n) * 0x80))
> +#define DWC3_LCSR_USB32CTL(n) (0xd07c + ((n) * 0x80))
> +
> /* Bit fields */
>
> /* Global SoC Bus Configuration INCRx Register 0 */
> @@ -653,6 +656,16 @@
> #define DWC3_OSTS_VBUSVLD BIT(1)
> #define DWC3_OSTS_CONIDSTS BIT(0)
>
> +/* LLUCTL Register */
> +#define DWC3_LLUCTL_FORCE_GEN1 BIT(10)
> +
> +/* LCSR_USB32CTL Register */
> +#define DWC3_LCSR_USB32CTL_SPEED_MASK 0x3
> +#define DWC3_LCSR_GEN_1x1 0
> +#define DWC3_LCSR_GEN_1x2 1
> +#define DWC3_LCSR_GEN_2x1 2
> +#define DWC3_LCSR_GEN_2x2 3
> +
> /* Structures */
>
> struct dwc3_trb;
>
> --
>
> Thanks,
> Thinh
Hi Thinh,
Sure, will split it up into two patches and send as a series. But
might need your help in testing SSP patch as I don't have any device
supporting ssp.
Regards,
Krishna,
On Wed, May 17, 2023, Krishna Kurapati PSSNV wrote:
>
>
> On 5/17/2023 6:00 AM, Thinh Nguyen wrote:
> > On Wed, May 17, 2023, Thinh Nguyen wrote:
> > > On Sun, May 14, 2023, Krishna Kurapati wrote:
> > > > Currently for dwc3_usb31 controller, if maximum_speed is limited to
> > > > super-speed in DT, then device mode is limited to SS, but host mode
> > > > still works in SSP.
> > > >
> > > > The documentation for max-speed property is as follows:
> > > >
> > > > "Tells USB controllers we want to work up to a certain speed.
> > > > Incase this isn't passed via DT, USB controllers should default to
> > > > their maximum HW capability."
> > > >
> > > > It doesn't specify that the property is only for device mode.
> > > > There are cases where we need to limit the host's maximum speed to
> > > > SuperSpeed only. Use this property for host mode to contrain host's
> > > > speed to SuperSpeed.
> > > >
> > > > Signed-off-by: Krishna Kurapati <[email protected]>
> > > > ---
> > > > Link to v1: https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCAhqfAZ0Q$
> > > >
> > > > Discussion regarding the same at:
> > > > https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCDRLUrJWg$
> > > >
> > > > drivers/usb/dwc3/core.c | 8 ++++++++
> > > > drivers/usb/dwc3/core.h | 5 +++++
> > > > 2 files changed, 13 insertions(+)
> > > >
> > > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > > > index 278cd1c33841..33bc72595e74 100644
> > > > --- a/drivers/usb/dwc3/core.c
> > > > +++ b/drivers/usb/dwc3/core.c
> > > > @@ -1262,6 +1262,14 @@ static int dwc3_core_init(struct dwc3 *dwc)
> > > > }
> > > > }
> > > > + if ((hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) &&
> > > > + (DWC3_IP_IS(DWC31)) &&
> > > > + (dwc->maximum_speed == USB_SPEED_SUPER)) {
> > > > + reg = dwc3_readl(dwc->regs, DWC3_LLUCTL);
> > > > + reg |= DWC3_LLUCTL_FORCE_GEN1;
> > > > + dwc3_writel(dwc->regs, DWC3_LLUCTL, reg);
> > > > + }
> > > > +
> > >
> > > Perhaps this should be done for every usb3 port rather than just the
> > > port_0. This patch can go after your multi-port series is added to
> > > Greg's branch where you can check for number of usb3 ports.
> > >
> >
> > Can you also add dwc_usb32 settings? It should look something like this:
> >
> >
> > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > index 0beaab932e7d..4bd2564aa163 100644
> > --- a/drivers/usb/dwc3/core.c
> > +++ b/drivers/usb/dwc3/core.c
> > @@ -1262,6 +1262,40 @@ static int dwc3_core_init(struct dwc3 *dwc)
> > }
> > }
> > + if (hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) {
> > + int i;
> > +
> > + if (DWC3_IP_IS(DWC31) &&
> > + dwc->maximum_speed == USB_SPEED_SUPER) {
> > + for (i = 0; i < dwc->num_usb3_ports; i++) {
> > + reg = dwc3_readl(dwc->regs, DWC3_LLUCTL(i));
> > + reg |= DWC3_LLUCTL_FORCE_GEN1;
> > + dwc3_writel(dwc->regs, DWC3_LLUCTL(i), reg);
> > + }
> > + }
> > +
> > + if (DWC3_IP_IS(DWC32) &&
> > + dwc->max_ssp_rate != USB_SSP_GEN_2x2) {
> > + int lsr_speed = -EINVAL;
> > +
> > + if (dwc->maximum_speed == USB_SPEED_SUPER)
> > + lsr_speed = DWC3_LCSR_GEN_1x1;
> > + else if (dwc->max_ssp_rate == USB_SSP_GEN_2x1)
> > + lsr_speed = DWC3_LCSR_GEN_2x1;
> > + else if (dwc->max_ssp_rate == USB_SSP_GEN_1x2)
> > + lsr_speed = DWC3_LCSR_GEN_1x2;
> > +
> > + if (lsr_speed != -EINVAL) {
> > + for (i = 0; i < dwc->num_usb3_ports; i++) {
> > + reg = dwc3_readl(dwc->regs, DWC3_LCSR_USB32CTL(i));
> > + reg &= ~DWC3_LCSR_USB32CTL_SPEED_MASK;
> > + reg |= lsr_speed;
> > + dwc3_writel(dwc->regs, DWC3_LCSR_USB32CTL(i), reg);
> > + }
> > + }
> > + }
> > + }
> > +
> > return 0;
> > err_power_off_phy:
> > diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> > index d56457c02996..415e0215fe00 100644
> > --- a/drivers/usb/dwc3/core.h
> > +++ b/drivers/usb/dwc3/core.h
> > @@ -170,6 +170,9 @@
> > #define DWC3_OEVTEN 0xcc0C
> > #define DWC3_OSTS 0xcc10
> > +#define DWC3_LLUCTL(n) (0xd024 + ((n) * 0x80))
> > +#define DWC3_LCSR_USB32CTL(n) (0xd07c + ((n) * 0x80))
> > +
> > /* Bit fields */
> > /* Global SoC Bus Configuration INCRx Register 0 */
> > @@ -653,6 +656,16 @@
> > #define DWC3_OSTS_VBUSVLD BIT(1)
> > #define DWC3_OSTS_CONIDSTS BIT(0)
> > +/* LLUCTL Register */
> > +#define DWC3_LLUCTL_FORCE_GEN1 BIT(10)
> > +
> > +/* LCSR_USB32CTL Register */
> > +#define DWC3_LCSR_USB32CTL_SPEED_MASK 0x3
> > +#define DWC3_LCSR_GEN_1x1 0
> > +#define DWC3_LCSR_GEN_1x2 1
> > +#define DWC3_LCSR_GEN_2x1 2
> > +#define DWC3_LCSR_GEN_2x2 3
> > +
> > /* Structures */
> > struct dwc3_trb;
> >
> > --
> >
> > Thanks,
> > Thinh
>
>
> Hi Thinh,
>
> Sure, will split it up into two patches and send as a series. But might
> need your help in testing SSP patch as I don't have any device supporting
> ssp.
>
Sure. I can do that.
btw, it doesn't have to be SSP dwc_usb3x device. SSP devices are pretty
common nowadays.
Thanks,
Thinh
On 5/17/2023 5:41 AM, Thinh Nguyen wrote:
> On Sun, May 14, 2023, Krishna Kurapati wrote:
>> Currently for dwc3_usb31 controller, if maximum_speed is limited to
>> super-speed in DT, then device mode is limited to SS, but host mode
>> still works in SSP.
>>
>> The documentation for max-speed property is as follows:
>>
>> "Tells USB controllers we want to work up to a certain speed.
>> Incase this isn't passed via DT, USB controllers should default to
>> their maximum HW capability."
>>
>> It doesn't specify that the property is only for device mode.
>> There are cases where we need to limit the host's maximum speed to
>> SuperSpeed only. Use this property for host mode to contrain host's
>> speed to SuperSpeed.
>>
>> Signed-off-by: Krishna Kurapati <[email protected]>
>> ---
>> Link to v1: https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCAhqfAZ0Q$
>>
>> Discussion regarding the same at:
>> https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCDRLUrJWg$
>>
>> drivers/usb/dwc3/core.c | 8 ++++++++
>> drivers/usb/dwc3/core.h | 5 +++++
>> 2 files changed, 13 insertions(+)
>>
>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> index 278cd1c33841..33bc72595e74 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -1262,6 +1262,14 @@ static int dwc3_core_init(struct dwc3 *dwc)
>> }
>> }
>>
>> + if ((hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) &&
>> + (DWC3_IP_IS(DWC31)) &&
>> + (dwc->maximum_speed == USB_SPEED_SUPER)) {
>> + reg = dwc3_readl(dwc->regs, DWC3_LLUCTL);
>> + reg |= DWC3_LLUCTL_FORCE_GEN1;
>> + dwc3_writel(dwc->regs, DWC3_LLUCTL, reg);
>> + }
>> +
>
> Perhaps this should be done for every usb3 port rather than just the
> port_0. This patch can go after your multi-port series is added to
> Greg's branch where you can check for number of usb3 ports.
>
> Thanks,
> Thinh
>
Hi Thinh,
Seems like multiport would take little more time and I need this
patch to be ported to ACK for fixing customer issue. Would it be
possible to take this patch as is ? Once multiport is done, I will send
another patch to include the changes for mutliport as well.
Regards,
Krishna,
On Thu, Jul 06, 2023, Krishna Kurapati PSSNV wrote:
>
>
> On 5/17/2023 5:41 AM, Thinh Nguyen wrote:
> > On Sun, May 14, 2023, Krishna Kurapati wrote:
> > > Currently for dwc3_usb31 controller, if maximum_speed is limited to
> > > super-speed in DT, then device mode is limited to SS, but host mode
> > > still works in SSP.
> > >
> > > The documentation for max-speed property is as follows:
> > >
> > > "Tells USB controllers we want to work up to a certain speed.
> > > Incase this isn't passed via DT, USB controllers should default to
> > > their maximum HW capability."
> > >
> > > It doesn't specify that the property is only for device mode.
> > > There are cases where we need to limit the host's maximum speed to
> > > SuperSpeed only. Use this property for host mode to contrain host's
> > > speed to SuperSpeed.
> > >
> > > Signed-off-by: Krishna Kurapati <[email protected]>
> > > ---
> > > Link to v1: https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCAhqfAZ0Q$
> > >
> > > Discussion regarding the same at:
> > > https://urldefense.com/v3/__https://lore.kernel.org/all/[email protected]/__;!!A4F2R9G_pg!dCg_3WK2oNXNb6d0a_VuyjkeeZJTU1aY4dik6g35XB7mtG7EJeR1uPMfxFja49OfXp7Yhsg1yqjnylCYYEg7YCDRLUrJWg$
> > >
> > > drivers/usb/dwc3/core.c | 8 ++++++++
> > > drivers/usb/dwc3/core.h | 5 +++++
> > > 2 files changed, 13 insertions(+)
> > >
> > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > > index 278cd1c33841..33bc72595e74 100644
> > > --- a/drivers/usb/dwc3/core.c
> > > +++ b/drivers/usb/dwc3/core.c
> > > @@ -1262,6 +1262,14 @@ static int dwc3_core_init(struct dwc3 *dwc)
> > > }
> > > }
> > > + if ((hw_mode != DWC3_GHWPARAMS0_MODE_GADGET) &&
> > > + (DWC3_IP_IS(DWC31)) &&
> > > + (dwc->maximum_speed == USB_SPEED_SUPER)) {
> > > + reg = dwc3_readl(dwc->regs, DWC3_LLUCTL);
> > > + reg |= DWC3_LLUCTL_FORCE_GEN1;
> > > + dwc3_writel(dwc->regs, DWC3_LLUCTL, reg);
> > > + }
> > > +
> >
> > Perhaps this should be done for every usb3 port rather than just the
> > port_0. This patch can go after your multi-port series is added to
> > Greg's branch where you can check for number of usb3 ports.
> >
> > Thanks,
> > Thinh
> >
>
> Hi Thinh,
>
> Seems like multiport would take little more time and I need this patch to
> be ported to ACK for fixing customer issue. Would it be possible to take
> this patch as is ? Once multiport is done, I will send another patch to
> include the changes for mutliport as well.
>
This is not a fix patch. It will not be upstreamed until the next
release even if I Ack it now. Do you think we can get your multi-port
series in for the next release along with this? If not, then we can Ack
this version first (with a note to update for multi-port later).
I think it makes more sense wait and see if we can get your multi-port
series for the next release first. What do you think?
Thanks,
Thinh