linux-kernel - [PATCH RFC 1/2] pmdomain: ti-sci: Fix duplicate PD referrals

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Message-Id: <20240415-ti-sci-pd-v1-1-a0e56b8ad897@ideasonboard.com>
Date: Mon, 15 Apr 2024 19:00:23 +0300
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>, 
 Santosh Shilimkar <ssantosh@...nel.org>, Dave Gerlach <d-gerlach@...com>, 
 J Keerthy <j-keerthy@...com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Santosh Shilimkar <santosh.shilimkar@...cle.com>, 
 linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH RFC 1/2] pmdomain: ti-sci: Fix duplicate PD referrals

When the dts file has multiple referrers to a single PD (e.g.
simple-framebuffer and dss nodes both point to the DSS power-domain) the
ti-sci driver will create two power domains, both with the same ID, and
that will cause problems as one of the power domains will hide the other
one.

Fix this checking if a PD with the ID has already been created, and only
create a PD for new IDs.

Fixes: efa5c01cd7ee ("soc: ti: ti_sci_pm_domains: switch to use multiple genpds instead of one")
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
 drivers/pmdomain/ti/ti_sci_pm_domains.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/pmdomain/ti/ti_sci_pm_domains.c b/drivers/pmdomain/ti/ti_sci_pm_domains.c
index 9dddf227a3a6..1510d5ddae3d 100644
--- a/drivers/pmdomain/ti/ti_sci_pm_domains.c
+++ b/drivers/pmdomain/ti/ti_sci_pm_domains.c
@@ -114,6 +114,18 @@ static const struct of_device_id ti_sci_pm_domain_matches[] = {
 };
 MODULE_DEVICE_TABLE(of, ti_sci_pm_domain_matches);
 
+static bool ti_sci_pm_idx_exists(struct ti_sci_genpd_provider *pd_provider, u32 idx)
+{
+	struct ti_sci_pm_domain *pd;
+
+	list_for_each_entry(pd, &pd_provider->pd_list, node) {
+		if (pd->idx == idx)
+			return true;
+	}
+
+	return false;
+}
+
 static int ti_sci_pm_domain_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -149,8 +161,14 @@ static int ti_sci_pm_domain_probe(struct platform_device *pdev)
 				break;
 
 			if (args.args_count >= 1 && args.np == dev->of_node) {
-				if (args.args[0] > max_id)
+				if (args.args[0] > max_id) {
 					max_id = args.args[0];
+				} else {
+					if (ti_sci_pm_idx_exists(pd_provider, args.args[0])) {
+						index++;
+						continue;
+					}
+				}
 
 				pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 				if (!pd) {

-- 
2.34.1