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usb: dwc3: Avoid CLR block DB if run/stop is cleared

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It is required to SET block doorbell to GSI to avoid USB wrapper
from ringing doorbell before queuing stop xfer command to GSI
endpoint as part of stopping controller and CLR block doorbell to
GSI after queuing start xfer command to GSI endpoint.

Since ipa_work_handler runs in workqueue context there is a possiblity
that CLR block doorbell will happen even after run/stop is
cleared which may lead to SMMU fault. Avoid this by adding a check
for pullups_connected before clearing block doorbell.

Change-Id: Iedb8a96da197834169bdabae6381c974d50c95de
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>
This commit is contained in:
Pratham Pratap 2020-01-10 18:39:47 +05:30 • committed by Udipto Goswami
commit 3e007f7d87
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/dwc3/dwc3-msm.c
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@ -1664,6 +1664,7 @@ static void gsi_set_clear_dbell(struct usb_ep *ep,
struct dwc3 *dwc = dep->dwc;
struct dwc3_msm *mdwc = dev_get_drvdata(dwc->dev->parent);
dbg_log_string("block_db(%d)", block_db);
dwc3_msm_write_reg_field(mdwc->base, GSI_GENERAL_CFG_REG(mdwc->gsi_reg),
BLOCK_GSI_WR_GO_MASK, block_db);
}
@ -1798,6 +1799,14 @@ int usb_gsi_ep_op(struct usb_ep *ep, void *op_data, enum gsi_ep_op op)
break;
case GSI_EP_OP_SET_CLR_BLOCK_DBL:
block_db = *((bool *)op_data);
spin_lock_irqsave(&dwc->lock, flags);
if (!dwc->pullups_connected && !block_db) {
dbg_log_string("No Pullup\n");
spin_unlock_irqrestore(&dwc->lock, flags);
return -ESHUTDOWN;
}
spin_unlock_irqrestore(&dwc->lock, flags);
gsi_set_clear_dbell(ep, block_db);
break;
case GSI_EP_OP_CHECK_FOR_SUSPEND: