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From:   Sameer Pujar <spujar@nvidia.com>
To:     <dan.j.williams@intel.com>, <vkoul@kernel.org>
CC:     <treding@nvidia.com>, <jonathanh@nvidia.com>,
        <dmaengine@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, Sameer Pujar <spujar@nvidia.com>
Subject: [PATCH v3 2/2] dmaengine: tegra210-adma: update system sleep callbacks
Date:   Wed, 13 Mar 2019 17:02:37 +0530
Message-ID: <1552476757-22360-2-git-send-email-spujar@nvidia.com>
In-Reply-To: <1552476757-22360-1-git-send-email-spujar@nvidia.com>
References: <1552476757-22360-1-git-send-email-spujar@nvidia.com>
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If the driver is active till late suspend, where runtime PM cannot run,
force suspend is essential in such case to put the device in low power
state. Thus pm_runtime_force_suspend and pm_runtime_force_resume are
used as system sleep callbacks during system wide PM transitions.
Late system sleep callbacks are used to ensure, for instance, that the
sound core has suspended any on-going activity, including stopping the
ADMA if active, before we attempt to suspend the ADMA.

Suggested-by: Jonathan Hunter <jonathanh@nvidia.com>
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
---
 drivers/dma/tegra210-adma.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
index 650cd9c..253d312 100644
--- a/drivers/dma/tegra210-adma.c
+++ b/drivers/dma/tegra210-adma.c
@@ -796,17 +796,11 @@ static int tegra_adma_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int tegra_adma_pm_suspend(struct device *dev)
-{
-	return pm_runtime_suspended(dev) == false;
-}
-#endif
-
 static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
 	SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
 			   tegra_adma_runtime_resume, NULL)
-	SET_SYSTEM_SLEEP_PM_OPS(tegra_adma_pm_suspend, NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				     pm_runtime_force_resume)
 };
 
 static struct platform_driver tegra_admac_driver = {
-- 
2.7.4