evie/android_kernel_oneplus_msm8998
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usb: dwc3: Skip check for U3 when handling Function Suspend

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Skip check for U3 link state when we receive Function Suspend.
Link is not in U3 when host sends Function Suspend, but will
be in U3 if/when the subsequent Bus Suspend arrives.
If we check for U3 in the case of Function Suspend, we will
not disconnect channels with IPA as the API that checks
pre-conditions for suspend will always return FALSE.
The U3 check is done as usual in the case of Bus Suspend from
the host.

CRs-Fixed: 966352
Change-Id: Ie9ee045a096b58256d2e8814338ffe0aa3c01163
Signed-off-by: Devdutt Patnaik <dpatnaik@codeaurora.org>
This commit is contained in:
Devdutt Patnaik 2016-02-12 18:23:25 -08:00 • committed by David Keitel
parent 64e4a14d1f
commit 5028f26ab3
1 changed files with 11 additions and 8 deletions
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19
drivers/usb/dwc3/dwc3-msm.c
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@ -1180,7 +1180,7 @@ static void gsi_set_clear_dbell(struct usb_ep *ep,
*
* @usb_ep - pointer to usb_ep instance to access DWC3 regs
*/
static bool gsi_check_ready_to_suspend(struct usb_ep *ep)
static bool gsi_check_ready_to_suspend(struct usb_ep *ep, bool f_suspend)
{
u32 timeout = 1500;
u32 reg = 0;
@ -1196,11 +1196,13 @@ static bool gsi_check_ready_to_suspend(struct usb_ep *ep)
return false;
}
}
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U3) {
dev_err(mdwc->dev, "Unable to suspend GSI ch\n");
return false;
/* Check for U3 only if we are not handling Function Suspend */
if (!f_suspend) {
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U3) {
dev_err(mdwc->dev, "Unable to suspend GSI ch\n");
return false;
}
}
return true;
@ -1226,7 +1228,7 @@ static int dwc3_msm_gsi_ep_op(struct usb_ep *ep,
struct dwc3_msm *mdwc = dev_get_drvdata(dwc->dev->parent);
struct usb_gsi_request *request;
struct gsi_channel_info *ch_info;
bool block_db;
bool block_db, f_suspend;
switch (op) {
case GSI_EP_OP_PREPARE_TRBS:
@ -1286,7 +1288,8 @@ static int dwc3_msm_gsi_ep_op(struct usb_ep *ep,
break;
case GSI_EP_OP_CHECK_FOR_SUSPEND:
dev_dbg(mdwc->dev, "EP_OP_CHECK_FOR_SUSPEND\n");
ret = gsi_check_ready_to_suspend(ep);
f_suspend = *((bool *)op_data);
ret = gsi_check_ready_to_suspend(ep, f_suspend);
break;
default:
dev_err(mdwc->dev, "%s: Invalid opcode GSI EP\n", __func__);