pmdomain: samsung: Fix splash-screen handover by enforcing a sync_state

It's has been reported that some Samsung platforms fails to boot with
genpd's new sync_state support.

Typically the problem exists for platforms where bootloaders are turning on
the splash-screen and handing it over to be managed by the kernel. However,
at this point, it's not clear how to correctly solve the problem.

Although, to make the platforms boot again, let's add a temporary hack in
the samsung power-domain provider driver, which enforces a sync_state that
allows the power-domains to be reset before consumer devices starts to be
attached.

Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/all/212a1a56-08a5-48a5-9e98-23de632168d0@samsung.com
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20250711114719.189441-1-ulf.hansson@linaro.org

diff --git a/drivers/pmdomain/samsung/exynos-pm-domains.c b/drivers/pmdomain/samsung/exynos-pm-domains.c
index 9b502e8751d18c2e1d973f910e7faa5f01e2a391..5d478bb37ad68afc7aed7c6ae19b5fefc94a9035 100644 (file)
--- a/drivers/pmdomain/samsung/exynos-pm-domains.c
+++ b/drivers/pmdomain/samsung/exynos-pm-domains.c
@@ -147,6 +147,15 @@ static int exynos_pd_probe(struct platform_device *pdev)
                                parent.np, child.np);
        }
 
+       /*
+        * Some Samsung platforms with bootloaders turning on the splash-screen
+        * and handing it over to the kernel, requires the power-domains to be
+        * reset during boot. As a temporary hack to manage this, let's enforce
+        * a sync_state.
+        */
+       if (!ret)
+               of_genpd_sync_state(np);
+
        pm_runtime_enable(dev);
        return ret;
 }