linux-kernel - [PATCH v2] usb: dwc2: add bus suspend/resume for dwc2

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1415237402-24665-1-git-send-email-kever.yang@rock-chips.com>
Date:	Thu,  6 Nov 2014 09:30:02 +0800
From:	Kever Yang <kever.yang@...k-chips.com>
To:	Paul Zimmerman <paulz@...opsys.com>, Felipe Balbi <balbi@...com>
Cc:	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	romain.perier@...il.com, Heiko Stuebner <heiko@...ech.de>,
	dianders@...omium.org, sonnyrao@...omium.org,
	addy.ke@...k-chips.com, cf@...k-chips.com, xjq@...k-chips.com,
	hj@...k-chips.com, dkl@...k-chips.com, huangtao@...k-chips.com,
	linux-rockchip@...ts.infradead.org,
	Kever Yang <kever.yang@...k-chips.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] usb: dwc2: add bus suspend/resume for dwc2

Hcd controller needs bus_suspend/resume, dwc2 controller make
root hub generate suspend/resume signal with hprt0 register
when work in host mode.
After the root hub enter suspend, we can make controller enter
low power state with PCGCTL register.

We also update the lx_state for hsotg state.

This patch has tested on rk3288 with suspend/resume.

Signed-off-by: Kever Yang <kever.yang@...k-chips.com>
---

Changes in v2:
- update commit message
- make dwc2 suspend/resume sourcecode work

 drivers/usb/dwc2/hcd.c | 78 +++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 67 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 0a0e6f0..01a415b 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -1471,6 +1471,30 @@ static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
 	}
 }
 
+static void dwc2_port_resume(struct dwc2_hsotg *hsotg)
+{
+	u32 hprt0;
+
+	/* After clear the Stop PHY clock bit, we should wait for a moment
+	 * for PLL work stable with clock output.
+	 */
+	writel(0, hsotg->regs + PCGCTL);
+	usleep_range(2000, 4000);
+
+	hprt0 = dwc2_read_hprt0(hsotg);
+	hprt0 |= HPRT0_RES;
+	writel(hprt0, hsotg->regs + HPRT0);
+	hprt0 &= ~HPRT0_SUSP;
+	/* according to USB2.0 Spec 7.1.7.7, the host must send the resume
+	 * signal for at least 20ms
+	 */
+	usleep_range(20000, 25000);
+
+	hprt0 &= ~HPRT0_RES;
+	writel(hprt0, hsotg->regs + HPRT0);
+	hsotg->lx_state = DWC2_L0;
+}
+
 /* Handles hub class-specific requests */
 static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
 				u16 wvalue, u16 windex, char *buf, u16 wlength)
@@ -1516,17 +1540,7 @@ static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
 		case USB_PORT_FEAT_SUSPEND:
 			dev_dbg(hsotg->dev,
 				"ClearPortFeature USB_PORT_FEAT_SUSPEND\n");
-			writel(0, hsotg->regs + PCGCTL);
-			usleep_range(20000, 40000);
-
-			hprt0 = dwc2_read_hprt0(hsotg);
-			hprt0 |= HPRT0_RES;
-			writel(hprt0, hsotg->regs + HPRT0);
-			hprt0 &= ~HPRT0_SUSP;
-			usleep_range(100000, 150000);
-
-			hprt0 &= ~HPRT0_RES;
-			writel(hprt0, hsotg->regs + HPRT0);
+			dwc2_port_resume(hsotg);
 			break;
 
 		case USB_PORT_FEAT_POWER:
@@ -2299,6 +2313,44 @@ static void _dwc2_hcd_stop(struct usb_hcd *hcd)
 	usleep_range(1000, 3000);
 }
 
+static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
+{
+	struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
+	u32 hprt0;
+
+	if (!((hsotg->op_state == OTG_STATE_B_HOST) ||
+		(hsotg->op_state == OTG_STATE_A_HOST)))
+		return 0;
+
+	if (hsotg->lx_state != DWC2_L0)
+		return 0;
+
+	hprt0 = dwc2_read_hprt0(hsotg);
+	if (hprt0 & HPRT0_CONNSTS)
+		dwc2_port_suspend(hsotg, 1);
+
+	return 0;
+}
+
+static int _dwc2_hcd_resume(struct usb_hcd *hcd)
+{
+	struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
+	u32 hprt0;
+
+	if (!((hsotg->op_state == OTG_STATE_B_HOST) ||
+		(hsotg->op_state == OTG_STATE_A_HOST)))
+		return 0;
+
+	if (hsotg->lx_state != DWC2_L2)
+		return 0;
+
+	hprt0 = dwc2_read_hprt0(hsotg);
+	if ((hprt0 & HPRT0_CONNSTS) && (hprt0 & HPRT0_SUSP))
+		dwc2_port_resume(hsotg);
+
+	return 0;
+}
+
 /* Returns the current frame number */
 static int _dwc2_hcd_get_frame_number(struct usb_hcd *hcd)
 {
@@ -2669,6 +2721,10 @@ static struct hc_driver dwc2_hc_driver = {
 	.hub_status_data = _dwc2_hcd_hub_status_data,
 	.hub_control = _dwc2_hcd_hub_control,
 	.clear_tt_buffer_complete = _dwc2_hcd_clear_tt_buffer_complete,
+#ifdef CONFIG_PM
+	.bus_suspend = _dwc2_hcd_suspend,
+	.bus_resume = _dwc2_hcd_resume,
+#endif
 };
 
 /*
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/