This is a note to let you know that I've just added the patch titled
soc: mtk-pm-domains: do not register smi node as syscon
to the 5.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
soc-mtk-pm-domains-do-not-register-smi-node-as-sysco.patch
and it can be found in the queue-5.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bcc7303b619118cc79c59cdf78345ab1696ca8dd
Author: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
Date: Tue Jun 1 11:59:04 2021 +0800
soc: mtk-pm-domains: do not register smi node as syscon
[ Upstream commit eed6ff1bb2da65067d928f4ab322c7d75f944fa4 ]
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@xxxxxxxxxxxx>
Reviewed-by: chun-jie.chen <chun-jie.chen@xxxxxxxxxxxx>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210601035905.2970384-2-hsinyi@xxxxxxxxxxxx
Signed-off-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
index 0af00efa0ef8..22fa52f0e86e 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) {
