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usb: dwc2: add hibernation core parameter 

dwc2 may not be able to exit from hibernation if the hardware
does not provide a way to detect resume signalling in this state.
Thus, add the possibility to disable hibernation feature.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Gregory Herrero 2015-04-29 22:09:19 +02:00 committed by Felipe Balbi
parent 2d1165a4b9
commit 285046aa11
4 changed files with 37 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/usb/dwc2/core.c
View File

@ -342,6 +342,9 @@ int dwc2_exit_hibernation(struct dwc2_hsotg *hsotg, bool restore)
u32 pcgcctl;
int ret = 0;
if (!hsotg->core_params->hibernation)
return -ENOTSUPP;
pcgcctl = readl(hsotg->regs + PCGCTL);
pcgcctl &= ~PCGCTL_STOPPCLK;
writel(pcgcctl, hsotg->regs + PCGCTL);
@ -392,6 +395,9 @@ int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg)
u32 pcgcctl;
int ret = 0;
if (!hsotg->core_params->hibernation)
return -ENOTSUPP;
/* Backup all registers */
ret = dwc2_backup_global_registers(hsotg);
if (ret) {
@ -2998,6 +3004,23 @@ static void dwc2_set_param_external_id_pin_ctl(struct dwc2_hsotg *hsotg,
hsotg->core_params->external_id_pin_ctl = val;
}
static void dwc2_set_param_hibernation(struct dwc2_hsotg *hsotg,
int val)
{
if (DWC2_OUT_OF_BOUNDS(val, 0, 1)) {
if (val >= 0) {
dev_err(hsotg->dev,
"'%d' invalid for parameter hibernation\n",
val);
dev_err(hsotg->dev, "hibernation must be 0 or 1\n");
}
val = 0;
dev_dbg(hsotg->dev, "Setting hibernation to %d\n", val);
}
hsotg->core_params->hibernation = val;
}
/*
* This function is called during module intialization to pass module parameters
* for the DWC_otg core.
@ -3043,6 +3066,7 @@ void dwc2_set_parameters(struct dwc2_hsotg *hsotg,
dwc2_set_param_otg_ver(hsotg, params->otg_ver);
dwc2_set_param_uframe_sched(hsotg, params->uframe_sched);
dwc2_set_param_external_id_pin_ctl(hsotg, params->external_id_pin_ctl);
dwc2_set_param_hibernation(hsotg, params->hibernation);
}
/**

7
drivers/usb/dwc2/core.h
View File

@ -336,6 +336,12 @@ enum dwc2_ep0_state {
* case.
* 0 - No (default)
* 1 - Yes
* @hibernation: Specifies whether the controller support hibernation.
* If hibernation is enabled, the controller will enter
* hibernation in both peripheral and host mode when
* needed.
* 0 - No (default)
* 1 - Yes
*
* The following parameters may be specified when starting the module. These
* parameters define how the DWC_otg controller should be configured. A
@ -374,6 +380,7 @@ struct dwc2_core_params {
int ahbcfg;
int uframe_sched;
int external_id_pin_ctl;
int hibernation;
};
/**

7
drivers/usb/dwc2/core_intr.c
View File

@ -347,7 +347,7 @@ static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
dctl &= ~DCTL_RMTWKUPSIG;
writel(dctl, hsotg->regs + DCTL);
ret = dwc2_exit_hibernation(hsotg, true);
if (ret)
if (ret && (ret != -ENOTSUPP))
dev_err(hsotg->dev, "exit hibernation failed\n");
call_gadget(hsotg, resume);
@ -428,8 +428,9 @@ static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
ret = dwc2_enter_hibernation(hsotg);
if (ret) {
dev_err(hsotg->dev,
"enter hibernation failed\n");
if (ret != -ENOTSUPP)
dev_err(hsotg->dev,
"enter hibernation failed\n");
goto skip_power_saving;
}

2
drivers/usb/dwc2/platform.c
View File

@ -78,6 +78,7 @@ static const struct dwc2_core_params params_bcm2835 = {
.ahbcfg = 0x10,
.uframe_sched = 0,
.external_id_pin_ctl = -1,
.hibernation = -1,
};
static const struct dwc2_core_params params_rk3066 = {
@ -107,6 +108,7 @@ static const struct dwc2_core_params params_rk3066 = {
.ahbcfg = 0x7, /* INCR16 */
.uframe_sched = -1,
.external_id_pin_ctl = -1,
.hibernation = -1,
};
/**