linux-kernel - [PATCH] PM: domains: Fix domain attach for CONFIG_PM

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Date:   Tue, 24 Aug 2021 17:23:38 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Rajendra Nayak <rnayak@...eaurora.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pm@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] PM: domains: Fix domain attach for CONFIG_PM_OPP=n

If CONFIG_PM_OPP=n, of_get_required_opp_performance_state() always
returns -EOPNOTSUPP, and all drivers for devices that are part of a PM
Domain fail to probe with:

    failed to set required performance state for power-domain foo: -95
    probe of bar failed with error -95

Fix this by treating -EOPNOTSUPP the same as -ENODEV.

Fixes: c016baf7dc58e77a ("PM: domains: Add support for 'required-opps' to set default perf state")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 drivers/base/power/domain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index a10d740c4f2a1c28..7b197690e6442911 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2760,7 +2760,7 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
 
 	/* Set the default performance state */
 	pstate = of_get_required_opp_performance_state(dev->of_node, index);
-	if (pstate < 0 && pstate != -ENODEV) {
+	if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) {
 		ret = pstate;
 		goto err;
 	} else if (pstate > 0) {
-- 
2.25.1