linux-kernel - [PATCH v2 02/12] soundwire: intel: reset pm

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Date:   Mon, 17 Aug 2020 23:29:13 +0800
From:   Bard Liao <yung-chuan.liao@...ux.intel.com>
To:     alsa-devel@...a-project.org, vkoul@...nel.org
Cc:     vinod.koul@...aro.org, linux-kernel@...r.kernel.org, tiwai@...e.de,
        broonie@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, rander.wang@...ux.intel.com,
        ranjani.sridharan@...ux.intel.com, hui.wang@...onical.com,
        pierre-louis.bossart@...ux.intel.com, sanyog.r.kale@...el.com,
        mengdong.lin@...el.com, bard.liao@...el.com
Subject: [PATCH v2 02/12] soundwire: intel: reset pm_runtime status during system resume

From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

The system resume does the entire bus re-initialization and brings it
to full-power. If the device was pm_runtime suspended, there is no
need to run the pm_runtime resume sequence after the system runtime.

Follow the documentation from runtime_pm.rst, and conditionally
disable, set_active and re-enable the device on system resume.

Note that pm_runtime_suspended() is used instead of
pm_runtime_status_suspended() so that we can deal with the case where
pm_runtime is disabled.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
---
 drivers/soundwire/intel.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 85a0bb6af4fe..0e21bae3cd19 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1434,6 +1434,12 @@ static int intel_suspend(struct device *dev)
 		return 0;
 	}
 
+	if (pm_runtime_suspended(dev)) {
+		dev_dbg(dev, "%s: pm_runtime status: suspended\n", __func__);
+
+		return 0;
+	}
+
 	ret = sdw_cdns_enable_interrupt(cdns, false);
 	if (ret < 0) {
 		dev_err(dev, "cannot disable interrupts on suspend\n");
@@ -1494,6 +1500,16 @@ static int intel_resume(struct device *dev)
 		return 0;
 	}
 
+	if (pm_runtime_suspended(dev)) {
+		dev_dbg(dev, "%s: pm_runtime status was suspended, forcing active\n", __func__);
+
+		/* follow required sequence from runtime_pm.rst */
+		pm_runtime_disable(dev);
+		pm_runtime_set_active(dev);
+		pm_runtime_mark_last_busy(dev);
+		pm_runtime_enable(dev);
+	}
+
 	ret = intel_init(sdw);
 	if (ret) {
 		dev_err(dev, "%s failed: %d", __func__, ret);
-- 
2.17.1