Hi Felipe,
On 10/16/2014 06:30 AM, Felipe Balbi wrote:
On Wed, Oct 15, 2014 at 10:46:18PM -0700, Kever Yang wrote:
This patch add suspend/resume for dwc2 hcd controller.
adds
Signed-off-by: Kever Yang <kever.yang@xxxxxxxxxxxxxx>
---
drivers/usb/dwc2/hcd.c | 71 ++++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 60 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index fddd923..c1801d8 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -1474,6 +1474,23 @@ static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
}
}
+static void dwc2_port_resume(struct dwc2_hsotg *hsotg)
+{
+ u32 hprt0;
+
+ writel(0, hsotg->regs + PCGCTL);
+ usleep_range(20000, 40000);
why this usleep_range() ? Is it documented somewhere ? How about adding
a comment explaining why you need to wait at least 20ms ?
This is a straight copy of CLEAR_FEATURE(PORT_SUSPEND) code
in dwc2_hcd_hub_control(), maybe Paul knows the detail?
I will check with USB2.0 spec and DWC databook to figure out
how long the delay it should be.
+ hprt0 = dwc2_read_hprt0(hsotg);
+ hprt0 |= HPRT0_RES;
+ writel(hprt0, hsotg->regs + HPRT0);
+ hprt0 &= ~HPRT0_SUSP;
+ usleep_range(100000, 150000);
and another one here, why ?
+ hprt0 &= ~HPRT0_RES;
+ writel(hprt0, hsotg->regs + HPRT0);
+}
+
/* 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)
@@ -1519,17 +1536,7 @@ 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:
@@ -2304,6 +2311,45 @@ 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)
+ return 0;
+
+ if (hsotg->lx_state != DWC2_L0)
+ return 0;
+
+ hprt0 = dwc2_read_hprt0(hsotg);
+ if (hprt0 | HPRT0_CONNSTS)
did you mean:
if (hprt0 & HPRT0_CONNSTS) ??
+ dwc2_port_suspend(hsotg, 1);
always 1 ?
+ clk_disable(hsotg->clk);
this I keep getting wrong, but if ->bus_suspend() is really the one used
for actual system sleep, then you might want to fiddle with the clocks
only from the parent platform glue. I haven't really read the code to
make sure, however, so this might be a completely bogus comment :-)
+ 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)
+ return 0;
+
+ if (hsotg->lx_state != DWC2_L2)
+ return 0;
+
+ clk_enable(hsotg->clk);
+
+ hprt0 = dwc2_read_hprt0(hsotg);
+ if (hprt0 | HPRT0_CONNSTS | HPRT0_SUSP)
and here:
if ((hprt0 & HPRT0_CONNSTS) &&
(hprt0 & HPRT0_SUSP)) ???
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