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cnss2: retry mhi fast suspend if mhi returns EBUSY

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Add code to retry mhi fast suspend if mhi layer has pending
packets and returns EBUSY.

Change-Id: Ifb9ee8371c092db3fd7bece2de1e7166ac6f303f
Signed-off-by: Mohammed Siddiq <msiddiq@codeaurora.org>
This commit is contained in:
Mohammed Siddiq 2021-08-03 18:12:20 +05:30 • committed by Gerrit - the friendly Code Review server
commit d87467913d
1 changed files with 10 additions and 10 deletions
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20
drivers/net/wireless/cnss2/pci.c
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@ -1737,20 +1737,20 @@ static int cnss_pci_set_mhi_state(struct cnss_pci_data *pci_priv,
break;
case CNSS_MHI_SUSPEND:
mutex_lock(&pci_priv->mhi_ctrl->pm_mutex);
retry:
if (pci_priv->drv_connected_last) {
ret = mhi_pm_fast_suspend(pci_priv->mhi_ctrl, true);
} else {
ret = mhi_pm_suspend(pci_priv->mhi_ctrl);
/* in some corner case, when cnss try to suspend,
* there is still packets pending in mhi layer,
* so retry suspend to save roll back effort.
*/
while (ret == -EBUSY && retry < MHI_SUSPEND_RETRY_CNT) {
usleep_range(5000, 6000);
retry++;
cnss_pr_err("mhi is busy, retry #%u", retry);
ret = mhi_pm_suspend(pci_priv->mhi_ctrl);
}
}
/* in some corner case, when cnss try to suspend,
* there is still packets pending in mhi layer,
* so retry suspend to save roll back effort.
*/
if (ret == -EBUSY && retry++ < MHI_SUSPEND_RETRY_CNT) {
usleep_range(5000, 6000);
cnss_pr_err("mhi is busy, retry #%u", retry);
goto retry;
}
mutex_unlock(&pci_priv->mhi_ctrl->pm_mutex);
break;