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 v4 03/12] bus: mhi: core: Skip device wake in error or shutdown states
Date: Mon, 9 Nov 2020 12:47:22 -0800 [thread overview]
Message-ID: <1604954851-23396-4-git-send-email-bbhatt@codeaurora.org> (raw)
In-Reply-To: <1604954851-23396-1-git-send-email-bbhatt@codeaurora.org>
MHI client drivers can request a device wake even if the device
may be in an error state or undergoing a shutdown. To prevent
unnecessary device wake processing, check for the device state
and bail out early so that the clients are made aware of the
device state sooner.
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/bus/mhi/core/pm.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 805b6fa74..0299196 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -827,6 +827,10 @@ int __mhi_device_get_sync(struct mhi_controller *mhi_cntrl)
/* Wake up the device */
read_lock_bh(&mhi_cntrl->pm_lock);
+ if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
+ read_unlock_bh(&mhi_cntrl->pm_lock);
+ return -EIO;
+ }
mhi_cntrl->wake_get(mhi_cntrl, true);
if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state))
mhi_trigger_resume(mhi_cntrl);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-11-09 20:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-09 20:47 [PATCH v4 00/12] Bug fixes and improvements for MHI power operations Bhaumik Bhatt
2020-11-09 20:47 ` [PATCH v4 01/12] bus: mhi: core: Use appropriate names for firmware load functions Bhaumik Bhatt
2020-11-09 20:47 ` [PATCH v4 02/12] bus: mhi: core: Move to using high priority workqueue Bhaumik Bhatt
2020-11-09 20:47 ` Bhaumik Bhatt [this message]
2020-11-09 20:47 ` [PATCH v4 04/12] bus: mhi: core: Move to SYS_ERROR regardless of RDDM capability Bhaumik Bhatt
2020-11-16 6:12 ` Manivannan Sadhasivam
2020-11-09 20:47 ` [PATCH v4 05/12] bus: mhi: core: Prevent sending multiple RDDM entry callbacks Bhaumik Bhatt
2020-11-09 20:47 ` [PATCH v4 06/12] bus: mhi: core: Move to an error state on any firmware load failure Bhaumik Bhatt
2020-11-09 20:47 ` [PATCH v4 07/12] bus: mhi: core: Use appropriate label in firmware load handler API Bhaumik Bhatt
2020-11-09 20:47 ` [PATCH v4 08/12] bus: mhi: core: Move to an error state on mission mode failure Bhaumik Bhatt
2020-11-09 20:47 ` [PATCH v4 09/12] bus: mhi: core: Check for IRQ availability during registration Bhaumik Bhatt
2020-11-09 20:47 ` [PATCH v4 10/12] bus: mhi: core: Separate system error and power down handling Bhaumik Bhatt
2020-11-16 6:14 ` Manivannan Sadhasivam
2020-11-09 20:47 ` [PATCH v4 11/12] bus: mhi: core: Mark and maintain device states early on after power down Bhaumik Bhatt
2020-11-09 20:47 ` [PATCH v4 12/12] bus: mhi: core: Remove MHI event ring IRQ handlers when powering down Bhaumik Bhatt
2020-11-16 6:37 ` [PATCH v4 00/12] Bug fixes and improvements for MHI power operations Manivannan Sadhasivam
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