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pmdomain: samsung: Rework legacy splash-screen handover workaround 

Limit the workaround for the lack of the proper splash-screen handover
handling to the legacy ARM 32bit systems and replace forcing a sync_state
by explicite power domain shutdown. This approach lets compiler to
optimize it out on newer ARM 64bit systems.

Suggested-by: Ulf Hansson <ulf.hansson@linaro.org>
Fixes: 0745658aeb ("pmdomain: samsung: Fix splash-screen handover by enforcing a sync_state")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Marek Szyprowski 2025-10-27 13:55:15 +01:00 committed by Ulf Hansson
parent 7458f72cc2
commit fccac54b0d
1 changed files with 9 additions and 9 deletions
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18
drivers/pmdomain/samsung/exynos-pm-domains.c
View File

@ -128,6 +128,15 @@ static int exynos_pd_probe(struct platform_device *pdev)
pd->pd.power_on = exynos_pd_power_on; pd->pd.power_on = exynos_pd_power_on;
pd->local_pwr_cfg = pm_domain_cfg->local_pwr_cfg; pd->local_pwr_cfg = pm_domain_cfg->local_pwr_cfg;
/*
* 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.
*/
if (IS_ENABLED(CONFIG_ARM) &&
of_device_is_compatible(np, "samsung,exynos4210-pd"))
exynos_pd_power_off(&pd->pd);
on = readl_relaxed(pd->base + 0x4) & pd->local_pwr_cfg; on = readl_relaxed(pd->base + 0x4) & pd->local_pwr_cfg;
pm_genpd_init(&pd->pd, NULL, !on); pm_genpd_init(&pd->pd, NULL, !on);
@ -146,15 +155,6 @@ static int exynos_pd_probe(struct platform_device *pdev)
parent.np, child.np); 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); pm_runtime_enable(dev);
return ret; return ret;
} }