[PATCH 4.1 011/123] ARM: imx6: gpc: always enable PU domain if CONFIG_PM is not set

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lucas Stach <l.stach@pengutronix.de>

commit d438462c20a300139c2e5e65b96cadaa21b58d9a upstream.

If CONFIG_PM is not set the PU power domain needs to be enabled always,
otherwise there are two failure scenarios which will hang the system if
one of the devices in the PU domain is accessed.

1. New DTs (4.1+) drop the "always-on" property from the PU regulator, so
if it isn't properly enabled by the GPC code it will be disabled at the
end of boot.

2. If the bootloader already disabled the PU domain the GPC explicitly
needs to enable it again, even if the kernel doesn't do any power
management. This is a bit hypothetical, as it requires to boot a
mainline kernel on a downstream bootloader, as no mainline bootloader
disables the PM domains.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/mach-imx/gpc.c |   27 ++++++---------------------
 1 file changed, 6 insertions(+), 21 deletions(-)

--- a/arch/arm/mach-imx/gpc.c
+++ b/arch/arm/mach-imx/gpc.c
@@ -291,8 +291,6 @@ void __init imx_gpc_check_dt(void)
 	}
 }
 
-#ifdef CONFIG_PM_GENERIC_DOMAINS
-
 static void _imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
 {
 	int iso, iso2sw;
@@ -399,7 +397,6 @@ static struct genpd_onecell_data imx_gpc
 static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg)
 {
 	struct clk *clk;
-	bool is_off;
 	int i;
 
 	imx6q_pu_domain.reg = pu_reg;
@@ -416,18 +413,13 @@ static int imx_gpc_genpd_init(struct dev
 	}
 	imx6q_pu_domain.num_clks = i;
 
-	is_off = IS_ENABLED(CONFIG_PM);
-	if (is_off) {
-		_imx6q_pm_pu_power_off(&imx6q_pu_domain.base);
-	} else {
-		/*
-		 * Enable power if compiled without CONFIG_PM in case the
-		 * bootloader disabled it.
-		 */
-		imx6q_pm_pu_power_on(&imx6q_pu_domain.base);
-	}
+	/* Enable power always in case bootloader disabled it. */
+	imx6q_pm_pu_power_on(&imx6q_pu_domain.base);
 
-	pm_genpd_init(&imx6q_pu_domain.base, NULL, is_off);
+	if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
+		return 0;
+
+	pm_genpd_init(&imx6q_pu_domain.base, NULL, false);
 	return of_genpd_add_provider_onecell(dev->of_node,
 					     &imx_gpc_onecell_data);
 
@@ -437,13 +429,6 @@ clk_err:
 	return -EINVAL;
 }
 
-#else
-static inline int imx_gpc_genpd_init(struct device *dev, struct regulator *reg)
-{
-	return 0;
-}
-#endif /* CONFIG_PM_GENERIC_DOMAINS */
-
 static int imx_gpc_probe(struct platform_device *pdev)
 {
 	struct regulator *pu_reg;