From: Wesley Cheng <wcheng@codeaurora.org>
To: balbi@kernel.org, gregkh@linuxfoundation.org, Thinh.Nguyen@synopsys.com
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
jackp@codeaurora.org, Wesley Cheng <wcheng@codeaurora.org>
Subject: [PATCH 2/2] usb: dwc3: gadget: Preserve UDC max speed setting
Date: Wed, 28 Oct 2020 16:43:11 -0700 [thread overview]
Message-ID: <20201028234311.6464-3-wcheng@codeaurora.org> (raw)
In-Reply-To: <20201028234311.6464-1-wcheng@codeaurora.org>
The USB gadget/UDC driver can restrict the DWC3 controller speed using
dwc3_gadget_set_speed(). Store this setting into a variable, in order for
this setting to persist across controller resets due to runtime PM.
Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
---
drivers/usb/dwc3/core.h | 1 +
drivers/usb/dwc3/gadget.c | 108 ++++++++++++++++++++------------------
2 files changed, 58 insertions(+), 51 deletions(-)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 2f04b3e42bf1..390d3deef0ba 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1119,6 +1119,7 @@ struct dwc3 {
u32 nr_scratch;
u32 u1u2;
u32 maximum_speed;
+ u32 gadget_max_speed;
u32 ip;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 6364429b2122..1a93b92a5e6f 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1941,6 +1941,61 @@ static void dwc3_stop_active_transfers(struct dwc3 *dwc)
}
}
+static void __dwc3_gadget_set_speed(struct dwc3 *dwc)
+{
+ u32 reg;
+
+ reg = dwc3_readl(dwc->regs, DWC3_DCFG);
+ reg &= ~(DWC3_DCFG_SPEED_MASK);
+
+ /*
+ * WORKAROUND: DWC3 revision < 2.20a have an issue
+ * which would cause metastability state on Run/Stop
+ * bit if we try to force the IP to USB2-only mode.
+ *
+ * Because of that, we cannot configure the IP to any
+ * speed other than the SuperSpeed
+ *
+ * Refers to:
+ *
+ * STAR#9000525659: Clock Domain Crossing on DCTL in
+ * USB 2.0 Mode
+ */
+ if (DWC3_VER_IS_PRIOR(DWC3, 220A) &&
+ !dwc->dis_metastability_quirk) {
+ reg |= DWC3_DCFG_SUPERSPEED;
+ } else {
+ switch (dwc->gadget_max_speed) {
+ case USB_SPEED_LOW:
+ reg |= DWC3_DCFG_LOWSPEED;
+ break;
+ case USB_SPEED_FULL:
+ reg |= DWC3_DCFG_FULLSPEED;
+ break;
+ case USB_SPEED_HIGH:
+ reg |= DWC3_DCFG_HIGHSPEED;
+ break;
+ case USB_SPEED_SUPER:
+ reg |= DWC3_DCFG_SUPERSPEED;
+ break;
+ case USB_SPEED_SUPER_PLUS:
+ if (DWC3_IP_IS(DWC3))
+ reg |= DWC3_DCFG_SUPERSPEED;
+ else
+ reg |= DWC3_DCFG_SUPERSPEED_PLUS;
+ break;
+ default:
+ dev_err(dwc->dev, "invalid speed (%d)\n", dwc->gadget_max_speed);
+
+ if (DWC3_IP_IS(DWC3))
+ reg |= DWC3_DCFG_SUPERSPEED;
+ else
+ reg |= DWC3_DCFG_SUPERSPEED_PLUS;
+ }
+ }
+ dwc3_writel(dwc->regs, DWC3_DCFG, reg);
+}
+
static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
{
u32 reg;
@@ -1963,6 +2018,7 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
if (dwc->has_hibernation)
reg |= DWC3_DCTL_KEEP_CONNECT;
+ __dwc3_gadget_set_speed(dwc);
dwc->pullups_connected = true;
} else {
reg &= ~DWC3_DCTL_RUN_STOP;
@@ -2318,59 +2374,9 @@ static void dwc3_gadget_set_speed(struct usb_gadget *g,
{
struct dwc3 *dwc = gadget_to_dwc(g);
unsigned long flags;
- u32 reg;
spin_lock_irqsave(&dwc->lock, flags);
- reg = dwc3_readl(dwc->regs, DWC3_DCFG);
- reg &= ~(DWC3_DCFG_SPEED_MASK);
-
- /*
- * WORKAROUND: DWC3 revision < 2.20a have an issue
- * which would cause metastability state on Run/Stop
- * bit if we try to force the IP to USB2-only mode.
- *
- * Because of that, we cannot configure the IP to any
- * speed other than the SuperSpeed
- *
- * Refers to:
- *
- * STAR#9000525659: Clock Domain Crossing on DCTL in
- * USB 2.0 Mode
- */
- if (DWC3_VER_IS_PRIOR(DWC3, 220A) &&
- !dwc->dis_metastability_quirk) {
- reg |= DWC3_DCFG_SUPERSPEED;
- } else {
- switch (speed) {
- case USB_SPEED_LOW:
- reg |= DWC3_DCFG_LOWSPEED;
- break;
- case USB_SPEED_FULL:
- reg |= DWC3_DCFG_FULLSPEED;
- break;
- case USB_SPEED_HIGH:
- reg |= DWC3_DCFG_HIGHSPEED;
- break;
- case USB_SPEED_SUPER:
- reg |= DWC3_DCFG_SUPERSPEED;
- break;
- case USB_SPEED_SUPER_PLUS:
- if (DWC3_IP_IS(DWC3))
- reg |= DWC3_DCFG_SUPERSPEED;
- else
- reg |= DWC3_DCFG_SUPERSPEED_PLUS;
- break;
- default:
- dev_err(dwc->dev, "invalid speed (%d)\n", speed);
-
- if (DWC3_IP_IS(DWC3))
- reg |= DWC3_DCFG_SUPERSPEED;
- else
- reg |= DWC3_DCFG_SUPERSPEED_PLUS;
- }
- }
- dwc3_writel(dwc->regs, DWC3_DCFG, reg);
-
+ dwc->gadget_max_speed = speed;
spin_unlock_irqrestore(&dwc->lock, flags);
}
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-10-28 23:43 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-28 23:43 [PATCH 0/2] Allow DWC3 runtime suspend if UDC is unbinded Wesley Cheng
2020-10-28 23:43 ` [PATCH 1/2] usb: dwc3: gadget: Allow runtime suspend if UDC unbinded Wesley Cheng
2020-10-29 1:07 ` Alan Stern
2020-11-03 19:02 ` Wesley Cheng
2020-11-03 20:07 ` Alan Stern
2020-11-03 21:53 ` Wesley Cheng
2020-10-28 23:43 ` Wesley Cheng [this message]
2020-10-29 0:43 ` [PATCH 2/2] usb: dwc3: gadget: Preserve UDC max speed setting Thinh Nguyen
2020-10-29 2:00 ` Wesley Cheng
2020-10-29 2:57 ` Thinh Nguyen
2020-10-29 6:29 ` Thinh Nguyen
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