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From: Hsin-Yi Wang <hsinyi@chromium.org>
To: Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
	Rob Herring <robh+dt@kernel.org>,
	Enric Balletbo i Serra <enric.balletbo@collabora.com>,
	chun-jie.chen@mediatek.corp-partner.google.com,
	Yong Wu <yong.wu@mediatek.com>
Subject: [PATCH v2 2/3] soc: mtk-pm-domains: do not register smi node as syscon
Date: Tue,  1 Jun 2021 11:59:04 +0800
Message-ID: <20210601035905.2970384-2-hsinyi@chromium.org> (raw)
In-Reply-To: <20210601035905.2970384-1-hsinyi@chromium.org>

Mediatek requires mmsys clocks to be unprepared during suspend,
otherwise system has chances to hang.

syscon_regmap_lookup_by_phandle_optional() will attach and prepare the
first clock in smi node, leading to additional prepare to the clock
which is not balanced with the prepare/unprepare pair in resume/suspend
callbacks.

If a power domain node requests an smi node and the smi node's first
clock is an mmsys clock, it will results in an unstable suspend resume.

Fixes: f414854c8843 ("soc: mediatek: pm-domains: Add SMI block as bus protection block")
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: chun-jie.chen <chun-jie.chen@mediatek.com>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---
 drivers/soc/mediatek/mtk-pm-domains.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
index 536d8c64b2b4..b762bc40f56b 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.c
+++ b/drivers/soc/mediatek/mtk-pm-domains.c
@@ -297,6 +297,7 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
 	const struct scpsys_domain_data *domain_data;
 	struct scpsys_domain *pd;
 	struct device_node *root_node = scpsys->dev->of_node;
+	struct device_node *smi_node;
 	struct property *prop;
 	const char *clk_name;
 	int i, ret, num_clks;
@@ -352,9 +353,13 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
 	if (IS_ERR(pd->infracfg))
 		return ERR_CAST(pd->infracfg);
 
-	pd->smi = syscon_regmap_lookup_by_phandle_optional(node, "mediatek,smi");
-	if (IS_ERR(pd->smi))
-		return ERR_CAST(pd->smi);
+	smi_node = of_parse_phandle(node, "mediatek,smi", 0);
+	if (smi_node) {
+		pd->smi = device_node_to_regmap(smi_node);
+		of_node_put(smi_node);
+		if (IS_ERR(pd->smi))
+			return ERR_CAST(pd->smi);
+	}
 
 	num_clks = of_clk_get_parent_count(node);
 	if (num_clks > 0) {
-- 
2.32.0.rc0.204.g9fa02ecfa5-goog


  reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-01  3:59 [PATCH v2 1/3] soc: mtk-pm-domains: Fix the clock prepared issue Hsin-Yi Wang
2021-06-01  3:59 ` Hsin-Yi Wang [this message]
2021-06-02 12:15 ` Matthias Brugger

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