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usb: dwc3: gadget: Check for disabled LPM quirk

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[ Upstream commit 475e8be53d ]

If the device doesn't support LPM, make sure to disable the LPM
capability and don't advertise to the host that it supports it.

Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/9e68527ff932b1646f92a7593d4092a903754666.1618366071.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thinh Nguyen
2021-04-13 19:13:18 -07:00
committed by Greg Kroah-Hartman
parent 2946f95356
commit 8f7cdbbf61
3 changed files with 13 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/usb/dwc3/core.c
View File

@@ -1297,6 +1297,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
"snps,usb3_lpm_capable");
dwc->usb2_lpm_disable = device_property_read_bool(dev,
"snps,usb2-lpm-disable");
dwc->usb2_gadget_lpm_disable = device_property_read_bool(dev,
"snps,usb2-gadget-lpm-disable");
device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
&rx_thr_num_pkt_prd);
device_property_read_u8(dev, "snps,rx-max-burst-prd",

4
drivers/usb/dwc3/core.h
View File

@@ -1026,7 +1026,8 @@ struct dwc3_scratchpad_array {
* @dis_start_transfer_quirk: set if start_transfer failure SW workaround is
* not needed for DWC_usb31 version 1.70a-ea06 and below
* @usb3_lpm_capable: set if hadrware supports Link Power Management
* @usb2_lpm_disable: set to disable usb2 lpm
* @usb2_lpm_disable: set to disable usb2 lpm for host
* @usb2_gadget_lpm_disable: set to disable usb2 lpm for gadget
* @disable_scramble_quirk: set if we enable the disable scramble quirk
* @u2exit_lfps_quirk: set if we enable u2exit lfps quirk
* @u2ss_inp3_quirk: set if we enable P3 OK for U2/SS Inactive quirk
@@ -1227,6 +1228,7 @@ struct dwc3 {
unsigned dis_start_transfer_quirk:1;
unsigned usb3_lpm_capable:1;
unsigned usb2_lpm_disable:1;
unsigned usb2_gadget_lpm_disable:1;
unsigned disable_scramble_quirk:1;
unsigned u2exit_lfps_quirk:1;

9
drivers/usb/dwc3/gadget.c
View File

@@ -3398,6 +3398,7 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
/* Enable USB2 LPM Capability */
if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A) &&
!dwc->usb2_gadget_lpm_disable &&
(speed != DWC3_DSTS_SUPERSPEED) &&
(speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
@@ -3424,6 +3425,12 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
dwc3_gadget_dctl_write_safe(dwc, reg);
} else {
if (dwc->usb2_gadget_lpm_disable) {
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
reg &= ~DWC3_DCFG_LPM_CAP;
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
}
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
dwc3_gadget_dctl_write_safe(dwc, reg);
@@ -3871,7 +3878,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
dwc->gadget->speed = USB_SPEED_UNKNOWN;
dwc->gadget->sg_supported = true;
dwc->gadget->name = "dwc3-gadget";
dwc->gadget->lpm_capable = true;
dwc->gadget->lpm_capable = !dwc->usb2_gadget_lpm_disable;
/*
* FIXME We might be setting max_speed to <SUPER, however versions