linux-kernel - [PATCH 1/2] soc: imx: gpc: ARM power domain should be always-on

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Date:   Wed, 24 Jan 2018 00:42:13 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     <shawnguo@...nel.org>, <kernel@...gutronix.de>,
        <fabio.estevam@....com>, <robh+dt@...nel.org>,
        <aisheng.dong@....com>, <mark.rutland@....com>,
        <linux@...linux.org.uk>
CC:     <Linux-imx@....com>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] soc: imx: gpc: ARM power domain should be always-on

ARM power domain does NOT support runtime off, always-on
flag should be set to avoid incorrect power state in
pm_genpd_summary:

Before:

root@...6qpdlsolox:~# cat /sys/kernel/debug/pm_genpd/pm_genpd_summary
domain                          status          slaves
    /device                                             runtime status
----------------------------------------------------------------------
ARM                             off-0

After:

root@...6qpdlsolox:~# cat /sys/kernel/debug/pm_genpd/pm_genpd_summary
domain                          status          slaves
    /device                                             runtime status
----------------------------------------------------------------------
ARM                             on

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 drivers/soc/imx/gpc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c
index 53f7275..6cafa9b 100644
--- a/drivers/soc/imx/gpc.c
+++ b/drivers/soc/imx/gpc.c
@@ -254,6 +254,7 @@ static struct imx_pm_domain imx_gpc_domains[] = {
 	{
 		.base = {
 			.name = "ARM",
+			.flags = GENPD_FLAG_ALWAYS_ON,
 		},
 	}, {
 		.base = {
-- 
2.7.4