[PATCH 19/20] ASoC: mediatek: mt8186: Unwind runtime resume failures

[Pengpeng Hou]

mt8186_afe_runtime_resume() enables the base clocks and then a range of
clock gates before replaying the register cache.
mt8186_afe_enable_cgs() returns on the first failed gate without
disabling gates from the successful prefix, and runtime resume also
ignores regcache_sync().

Make the gate helper unwind its own partial prefix.  Route gate setup
failure through base-clock cleanup, and on cache replay failure restore
cache-only and dirty state before disabling all gates and base clocks.

The issue was identified via static analysis and manually reviewed.

Fixes: 097e874ad3fc ("ASoC: mediatek: mt8186: add platform driver")

Assisted-by: LLM
Signed-off-by: Pengpeng Hou <pengpeng at iscas.ac.cn>
---
 sound/soc/mediatek/mt8186/mt8186-afe-clk.c |  2 ++
 sound/soc/mediatek/mt8186/mt8186-afe-pcm.c | 15 +++++++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/sound/soc/mediatek/mt8186/mt8186-afe-clk.c b/sound/soc/mediatek/mt8186/mt8186-afe-clk.c
index daaca36a2d08..a7034aea2678 100644
--- a/sound/soc/mediatek/mt8186/mt8186-afe-clk.c
+++ b/sound/soc/mediatek/mt8186/mt8186-afe-clk.c
@@ -221,6 +221,8 @@ int mt8186_afe_enable_cgs(struct mtk_base_afe *afe)
 		if (ret) {
 			dev_err(afe->dev, "%s clk_prepare_enable %s fail %d\n",
 				__func__, aud_clks[i], ret);
+			while (--i >= CLK_I2S1_BCLK)
+				clk_disable_unprepare(afe_priv->clk[i]);
 			return ret;
 		}
 	}
diff --git a/sound/soc/mediatek/mt8186/mt8186-afe-pcm.c b/sound/soc/mediatek/mt8186/mt8186-afe-pcm.c
index 44a521c3a610..2888a49e9db2 100644
--- a/sound/soc/mediatek/mt8186/mt8186-afe-pcm.c
+++ b/sound/soc/mediatek/mt8186/mt8186-afe-pcm.c
@@ -2737,13 +2737,18 @@ static int mt8186_afe_runtime_resume(struct device *dev)
 
 	ret = mt8186_afe_enable_cgs(afe);
 	if (ret)
-		return ret;
+		goto disable_clock;
 
 	if (!afe->regmap || afe_priv->pm_runtime_bypass_reg_ctl)
 		goto skip_regmap;
 
 	regcache_cache_only(afe->regmap, false);
-	regcache_sync(afe->regmap);
+	ret = regcache_sync(afe->regmap);
+	if (ret) {
+		regcache_cache_only(afe->regmap, true);
+		regcache_mark_dirty(afe->regmap);
+		goto disable_cgs;
+	}
 
 	/* enable audio sys DCM for power saving */
 	regmap_update_bits(afe_priv->infracfg, PERI_BUS_DCM_CTRL, BIT(29), BIT(29));
@@ -2761,6 +2766,12 @@ static int mt8186_afe_runtime_resume(struct device *dev)
 
 skip_regmap:
 	return 0;
+
+disable_cgs:
+	mt8186_afe_disable_cgs(afe);
+disable_clock:
+	mt8186_afe_disable_clock(afe);
+	return ret;
 }
 
 static int mt8186_afe_component_probe(struct snd_soc_component *component)
-- 
2.43.0