[3.19.y-ckt stable] Patch "Revert "usb: dwc2: add bus suspend/resume for dwc2"" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    Revert "usb: dwc2: add bus suspend/resume for dwc2"

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt2.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 160f24b3f1ba3493e3158ed2eddb562624353463 Mon Sep 17 00:00:00 2001
From: Paul Zimmerman <Paul.Zimmerman at synopsys.com>
Date: Thu, 15 Jan 2015 19:21:46 +0000
Subject: Revert "usb: dwc2: add bus suspend/resume for dwc2"

commit b0bb9bb6ce01e37e47db04a31fd93dbe2d2be3d3 upstream.

This reverts commit 0cf884e819e05437287a668b9bfcc198bab6329c.
Even after applying the follow-on patch at
https://patchwork.kernel.org/patch/5325111
there are still problems with device connect on the Altera SOCFPGA
platform at least. One possible fix would be to add a whitelist
to enable suspend/resume on platforms where it does work correctly.

Signed-off-by: Paul Zimmerman <paulz at synopsys.com>
Signed-off-by: Felipe Balbi <balbi at ti.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/usb/dwc2/hcd.c | 88 +++++++-------------------------------------------
 1 file changed, 11 insertions(+), 77 deletions(-)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index a0cd9db..755e16b 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -1473,30 +1473,6 @@ 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)
@@ -1542,7 +1518,17 @@ 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");
-			dwc2_port_resume(hsotg);
+			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);
 			break;

 		case USB_PORT_FEAT_POWER:
@@ -2315,55 +2301,6 @@ 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;
-
-	/* TODO: We get into suspend from 'on' state, maybe we need to do
-	 * something if we get here from DWC2_L1(LPM sleep) state one day.
-	 */
-	if (hsotg->lx_state != DWC2_L0)
-		return 0;
-
-	hprt0 = dwc2_read_hprt0(hsotg);
-	if (hprt0 & HPRT0_CONNSTS) {
-		dwc2_port_suspend(hsotg, 1);
-	} else {
-		u32 pcgctl = readl(hsotg->regs + PCGCTL);
-
-		pcgctl |= PCGCTL_STOPPCLK;
-		writel(pcgctl, hsotg->regs + PCGCTL);
-	}
-
-	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);
-	else
-		writel(0, hsotg->regs + PCGCTL);
-
-	return 0;
-}
-
 /* Returns the current frame number */
 static int _dwc2_hcd_get_frame_number(struct usb_hcd *hcd)
 {
@@ -2734,9 +2671,6 @@ 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,
-
-	.bus_suspend = _dwc2_hcd_suspend,
-	.bus_resume = _dwc2_hcd_resume,
 };

 /*
--
1.9.1