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Message-Id: <1434579851-1719-10-git-send-email-kamal@canonical.com>
Date: Wed, 17 Jun 2015 15:21:54 -0700
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Paul Zimmerman <paulz@...opsys.com>, Felipe Balbi <balbi@...com>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 009/146] Revert "usb: dwc2: add bus suspend/resume for dwc2"
3.19.8-ckt2 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Paul Zimmerman <Paul.Zimmerman@...opsys.com>
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@...opsys.com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Kamal Mostafa <kamal@...onical.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
--
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