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Commit d8746791 authored by Mohammed Siddiq's avatar Mohammed Siddiq Committed by Gerrit - the friendly Code Review server
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cnss2: retry mhi fast suspend if mhi returns EBUSY 



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

Change-Id: Ifb9ee8371c092db3fd7bece2de1e7166ac6f303f
Signed-off-by: default avatarMohammed Siddiq <msiddiq@codeaurora.org>
parent 0a69438b

drivers/net/wireless/cnss2/pci.c

+10 −10
Original line number Diff line number Diff line
@@ -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) {

		if (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);

			}

			goto retry;

		}

		mutex_unlock(&pci_priv->mhi_ctrl->pm_mutex);

		break;