Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org A86D5C433A1
From:   Bhaumik Bhatt <bbhatt@codeaurora.org>
To:     manivannan.sadhasivam@linaro.org
Cc:     linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org,
        jhugo@codeaurora.org, linux-kernel@vger.kernel.org,
        Bhaumik Bhatt <bbhatt@codeaurora.org>
Subject: [PATCH v5 04/10] bus: mhi: core: Trigger host resume if suspended during mhi_device_get()
Date:   Thu, 23 Jul 2020 15:36:36 -0700
Message-Id: <1595543802-17859-5-git-send-email-bbhatt@codeaurora.org>
In-Reply-To: <1595543802-17859-1-git-send-email-bbhatt@codeaurora.org>
References: <1595543802-17859-1-git-send-email-bbhatt@codeaurora.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

It is possible that the host may be suspending or suspended and may
not allow an outgoing device wake assert immediately if a client has
requested for it. Ensure that the host wakes up and allows for it so
the client does not have to wait for an external trigger or an
outgoing packet to be queued for the host resume to occur.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/core/pm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index b227d41..27bb471 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -1112,6 +1112,9 @@ void mhi_device_get(struct mhi_device *mhi_dev)
 
 	mhi_dev->dev_wake++;
 	read_lock_bh(&mhi_cntrl->pm_lock);
+	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state))
+		mhi_trigger_resume(mhi_cntrl);
+
 	mhi_cntrl->wake_get(mhi_cntrl, true);
 	read_unlock_bh(&mhi_cntrl->pm_lock);
 }
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project