linux-kernel - [PATCH AUTOSEL 4.19 031/123] ASoC: Intel: Power down links before turning off display audio power

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Date:   Wed,  5 Dec 2018 04:34:23 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sriram Periyasamy <sriramx.periyasamy@...el.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 031/123] ASoC: Intel: Power down links before turning off display audio power

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

[ Upstream commit 4c10473d6ddf12ec124c9ff71a5d23bb5388478b ]

On certain platforms, Display HDMI HDA codec was not going to sleep state
after the use when links are powered down after turning off the display
power. As per the HW recommendation, links are powered down before turning
off the display power to ensure that the codec goes to sleep state.

This patch was updated from an earlier version submitted upstream [1]
which conflicted with the changes merged for HDaudio codec support
with the Intel DSP.

[1] https://patchwork.kernel.org/patch/10540213/

Signed-off-by: Sriram Periyasamy <sriramx.periyasamy@...el.com>
Signed-off-by: Sanyog Kale <sanyog.r.kale@...el.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/codecs/hdac_hdmi.c  | 11 +++++------
 sound/soc/intel/skylake/skl.c | 12 ++++++------
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c
index 7b8533abf637..b61d518f4fef 100644
--- a/sound/soc/codecs/hdac_hdmi.c
+++ b/sound/soc/codecs/hdac_hdmi.c
@@ -2184,11 +2184,6 @@ static int hdac_hdmi_runtime_suspend(struct device *dev)
 	 */
 	snd_hdac_codec_read(hdev, hdev->afg, 0,	AC_VERB_SET_POWER_STATE,
 							AC_PWRST_D3);
-	err = snd_hdac_display_power(bus, false);
-	if (err < 0) {
-		dev_err(dev, "Cannot turn on display power on i915\n");
-		return err;
-	}
 
 	hlink = snd_hdac_ext_bus_get_link(bus, dev_name(dev));
 	if (!hlink) {
@@ -2198,7 +2193,11 @@ static int hdac_hdmi_runtime_suspend(struct device *dev)
 
 	snd_hdac_ext_bus_link_put(bus, hlink);
 
-	return 0;
+	err = snd_hdac_display_power(bus, false);
+	if (err < 0)
+		dev_err(dev, "Cannot turn off display power on i915\n");
+
+	return err;
 }
 
 static int hdac_hdmi_runtime_resume(struct device *dev)
diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c
index 1d17be0f78a0..50f16a0f6535 100644
--- a/sound/soc/intel/skylake/skl.c
+++ b/sound/soc/intel/skylake/skl.c
@@ -752,6 +752,12 @@ static void skl_probe_work(struct work_struct *work)
 		}
 	}
 
+	/*
+	 * we are done probing so decrement link counts
+	 */
+	list_for_each_entry(hlink, &bus->hlink_list, list)
+		snd_hdac_ext_bus_link_put(bus, hlink);
+
 	if (IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI)) {
 		err = snd_hdac_display_power(bus, false);
 		if (err < 0) {
@@ -761,12 +767,6 @@ static void skl_probe_work(struct work_struct *work)
 		}
 	}
 
-	/*
-	 * we are done probing so decrement link counts
-	 */
-	list_for_each_entry(hlink, &bus->hlink_list, list)
-		snd_hdac_ext_bus_link_put(bus, hlink);
-
 	/* configure PM */
 	pm_runtime_put_noidle(bus->dev);
 	pm_runtime_allow(bus->dev);
-- 
2.17.1