* [PATCH v2] usb: gadget: dwc2_udc_otg: implement pullup()
@ 2023-01-10 16:29 Mattijs Korpershoek
2023-01-10 17:23 ` Marek Vasut
0 siblings, 1 reply; 3+ messages in thread
From: Mattijs Korpershoek @ 2023-01-10 16:29 UTC (permalink / raw)
To: Lukasz Majewski, Marek Vasut
Cc: Harald Seiler, Dario Binacchi, Michael Trimarchi, u-boot,
Mattijs Korpershoek
Pullup is used by the usb framework in order to do software-controlled
usb_gadget_connect() and usb_gadget_disconnect().
Implement pullup() for dwc2 using the SOFT_DISCONNECT bit in the dctl
register:
* when pullup is on, clear SOFT_DISCONNECT
* when pullup is of, set SOFT_DISCONNECT
This is especially useful when a gadget disconnection is initiated but
no board_usb_cleanup() is called.
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
---
On some boards using the dwc2 controller, like the Khadas VIM3L, whenever
usb_gadget_release() is called, the D+ and D- lines are in an unknown state.
Because of that, the host can't detect usb disconnection.
It was attempted to be be fixed with [1] but ended up doing the gadget disconnection
too early, creating issues on NXP-based boards which use uuu [2].
By implementing pullup() in the controller driver, we ensure that the disconnection will
only be done when the framework calls usb_gadget_disconnect().
[1] https://lore.kernel.org/all/20220728-reset-usb-controller-v2-1-ef7657ce78b1@baylibre.com/
[2] https://lore.kernel.org/all/20230107164807.3597020-1-dario.binacchi@amarulasolutions.com/
---
Changes in v2:
- Simplified code to fix hungarian notation, appropriate type (u32) for register (Harald)
- Use clrsetbits_le32() for register write (Marek)
- Link to v1: https://lore.kernel.org/r/20230110-dwc2-pullup-v1-1-2bf9743e59e5@baylibre.com
---
drivers/usb/gadget/dwc2_udc_otg.c | 9 +++++++++
drivers/usb/gadget/dwc2_udc_otg_regs.h | 1 +
2 files changed, 10 insertions(+)
diff --git a/drivers/usb/gadget/dwc2_udc_otg.c b/drivers/usb/gadget/dwc2_udc_otg.c
index 77988f78ab30..d0a9be49ad9c 100644
--- a/drivers/usb/gadget/dwc2_udc_otg.c
+++ b/drivers/usb/gadget/dwc2_udc_otg.c
@@ -236,6 +236,14 @@ static int udc_enable(struct dwc2_udc *dev)
return 0;
}
+static int dwc2_gadget_pullup(struct usb_gadget *g, int is_on)
+{
+ clrsetbits_le32(®->dctl, SOFT_DISCONNECT,
+ (!is_on) << SOFT_DISCONNECT_BIT);
+
+ return 0;
+}
+
#if !CONFIG_IS_ENABLED(DM_USB_GADGET)
/*
Register entry point for the peripheral controller driver.
@@ -805,6 +813,7 @@ static void dwc2_fifo_flush(struct usb_ep *_ep)
}
static const struct usb_gadget_ops dwc2_udc_ops = {
+ .pullup = dwc2_gadget_pullup,
/* current versions must always be self-powered */
#if CONFIG_IS_ENABLED(DM_USB_GADGET)
.udc_start = dwc2_gadget_start,
diff --git a/drivers/usb/gadget/dwc2_udc_otg_regs.h b/drivers/usb/gadget/dwc2_udc_otg_regs.h
index 9ca6f4237572..3749ee5eb053 100644
--- a/drivers/usb/gadget/dwc2_udc_otg_regs.h
+++ b/drivers/usb/gadget/dwc2_udc_otg_regs.h
@@ -170,6 +170,7 @@ struct dwc2_usbotg_reg {
/* DWC2_UDC_OTG_DCTL device control register */
#define NORMAL_OPERATION (0x1<<0)
#define SOFT_DISCONNECT (0x1<<1)
+#define SOFT_DISCONNECT_BIT (1)
/* DWC2_UDC_OTG_DAINT device all endpoint interrupt register */
#define DAINT_OUT_BIT (16)
---
base-commit: 81996adedf42e89de97c2ed5dcde62be4bb4e4e0
change-id: 20230110-dwc2-pullup-5b0f5a073d6b
Best regards,
--
Mattijs Korpershoek <mkorpershoek@baylibre.com>
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] usb: gadget: dwc2_udc_otg: implement pullup()
2023-01-10 16:29 [PATCH v2] usb: gadget: dwc2_udc_otg: implement pullup() Mattijs Korpershoek
@ 2023-01-10 17:23 ` Marek Vasut
2023-01-11 8:13 ` Mattijs Korpershoek
0 siblings, 1 reply; 3+ messages in thread
From: Marek Vasut @ 2023-01-10 17:23 UTC (permalink / raw)
To: Mattijs Korpershoek, Lukasz Majewski
Cc: Harald Seiler, Dario Binacchi, Michael Trimarchi, u-boot
On 1/10/23 17:29, Mattijs Korpershoek wrote:
[...]
> diff --git a/drivers/usb/gadget/dwc2_udc_otg.c b/drivers/usb/gadget/dwc2_udc_otg.c
> index 77988f78ab30..d0a9be49ad9c 100644
> --- a/drivers/usb/gadget/dwc2_udc_otg.c
> +++ b/drivers/usb/gadget/dwc2_udc_otg.c
> @@ -236,6 +236,14 @@ static int udc_enable(struct dwc2_udc *dev)
> return 0;
> }
>
> +static int dwc2_gadget_pullup(struct usb_gadget *g, int is_on)
> +{
> + clrsetbits_le32(®->dctl, SOFT_DISCONNECT,
> + (!is_on) << SOFT_DISCONNECT_BIT);
Use
is_on ? 0 : SOFT_DISCONNECT
and you get rid of SOFT_DISCONNECT_BIT macro and the extra parenthesis
around (!is_on) which are not needed.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] usb: gadget: dwc2_udc_otg: implement pullup()
2023-01-10 17:23 ` Marek Vasut
@ 2023-01-11 8:13 ` Mattijs Korpershoek
0 siblings, 0 replies; 3+ messages in thread
From: Mattijs Korpershoek @ 2023-01-11 8:13 UTC (permalink / raw)
To: Marek Vasut, Lukasz Majewski
Cc: Harald Seiler, Dario Binacchi, Michael Trimarchi, u-boot
On Tue, Jan 10, 2023 at 18:23, Marek Vasut <marex@denx.de> wrote:
> On 1/10/23 17:29, Mattijs Korpershoek wrote:
>
> [...]
>
>> diff --git a/drivers/usb/gadget/dwc2_udc_otg.c b/drivers/usb/gadget/dwc2_udc_otg.c
>> index 77988f78ab30..d0a9be49ad9c 100644
>> --- a/drivers/usb/gadget/dwc2_udc_otg.c
>> +++ b/drivers/usb/gadget/dwc2_udc_otg.c
>> @@ -236,6 +236,14 @@ static int udc_enable(struct dwc2_udc *dev)
>> return 0;
>> }
>>
>> +static int dwc2_gadget_pullup(struct usb_gadget *g, int is_on)
>> +{
>> + clrsetbits_le32(®->dctl, SOFT_DISCONNECT,
>> + (!is_on) << SOFT_DISCONNECT_BIT);
>
> Use
>
> is_on ? 0 : SOFT_DISCONNECT
>
> and you get rid of SOFT_DISCONNECT_BIT macro and the extra parenthesis
> around (!is_on) which are not needed.
Will do. thank you for your patience and your good advice !
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-01-11 8:13 UTC | newest]
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2023-01-10 16:29 [PATCH v2] usb: gadget: dwc2_udc_otg: implement pullup() Mattijs Korpershoek
2023-01-10 17:23 ` Marek Vasut
2023-01-11 8:13 ` Mattijs Korpershoek
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