netdev - [PATCH 02/10] bus: mhi: pci_generic: Graceful shutdown on freeze

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Date:   Thu, 16 Dec 2021 13:42:19 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     mhi@...ts.linux.dev, hemantk@...eaurora.org, bbhatt@...eaurora.org,
        loic.poulain@...aro.org, thomas.perrot@...tlin.com,
        aleksander@...ksander.es, slark_xiao@....com,
        christophe.jaillet@...adoo.fr, keescook@...omium.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Manivannan Sadhasivam <mani@...nel.org>,
        stable@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 02/10] bus: mhi: pci_generic: Graceful shutdown on freeze

From: Loic Poulain <loic.poulain@...aro.org>

There is no reason for shutting down MHI ungracefully on freeze,
this causes the MHI host stack & device stack to not be aligned
anymore since the proper MHI reset sequence is not performed for
ungraceful shutdown.

Fixes: 5f0c2ee1fe8d ("bus: mhi: pci-generic: Fix hibernation")
Suggested-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
Reviewed-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
Reviewed-by: Hemant Kumar <hemantk@...eaurora.org>
Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/1635268180-13699-1-git-send-email-loic.poulain@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/bus/mhi/pci_generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c
index 94d8aa9c2eae..4f72bbcc53c9 100644
--- a/drivers/bus/mhi/pci_generic.c
+++ b/drivers/bus/mhi/pci_generic.c
@@ -1021,7 +1021,7 @@ static int __maybe_unused mhi_pci_freeze(struct device *dev)
 	 * context.
 	 */
 	if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
-		mhi_power_down(mhi_cntrl, false);
+		mhi_power_down(mhi_cntrl, true);
 		mhi_unprepare_after_power_down(mhi_cntrl);
 	}
 
-- 
2.25.1