linux-kernel - [PATCH V2] pmdomain: imx: wait SSAR when i.MX93 power domain on

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Message-Id: <20240814124740.2778952-1-peng.fan@oss.nxp.com>
Date: Wed, 14 Aug 2024 20:47:40 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: ulf.hansson@...aro.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de
Cc: kernel@...gutronix.de,
	festevam@...il.com,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org,
	Peng Fan <peng.fan@....com>,
	Stable@...r.kernel.org,
	Jacky Bai <ping.bai@....com>
Subject: [PATCH V2] pmdomain: imx: wait SSAR when i.MX93 power domain on

From: Peng Fan <peng.fan@....com>

With "quiet" set in bootargs, there is power domain failure:
"imx93_power_domain 44462400.power-domain: pd_off timeout: name:
 44462400.power-domain, stat: 4"

The current power on opertation takes ISO state as power on finished
flag, but it is wrong. Before powering on operation really finishes,
powering off comes and powering off will never finish because the last
powering on still not finishes, so the following powering off actually
not trigger hardware state machine to run. SSAR is the last step when
powering on a domain, so need to wait SSAR done when powering on.

Since EdgeLock Enclave(ELE) handshake is involved in the flow, enlarge
the waiting time to 10ms for both on and off to avoid timeout.

Cc: <Stable@...r.kernel.org>
Fixes: 0a0f7cc25d4a ("soc: imx: add i.MX93 SRC power domain driver")
Reviewed-by: Jacky Bai <ping.bai@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---

V2:
 Add Fixes tag and Cc stable (Per Ulf's comment)

 drivers/pmdomain/imx/imx93-pd.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/pmdomain/imx/imx93-pd.c b/drivers/pmdomain/imx/imx93-pd.c
index 1e94b499c19b..d750a7dc58d2 100644
--- a/drivers/pmdomain/imx/imx93-pd.c
+++ b/drivers/pmdomain/imx/imx93-pd.c
@@ -20,6 +20,7 @@
 #define FUNC_STAT_PSW_STAT_MASK		BIT(0)
 #define FUNC_STAT_RST_STAT_MASK		BIT(2)
 #define FUNC_STAT_ISO_STAT_MASK		BIT(4)
+#define FUNC_STAT_SSAR_STAT_MASK	BIT(8)
 
 struct imx93_power_domain {
 	struct generic_pm_domain genpd;
@@ -50,7 +51,7 @@ static int imx93_pd_on(struct generic_pm_domain *genpd)
 	writel(val, addr + MIX_SLICE_SW_CTRL_OFF);
 
 	ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val,
-				 !(val & FUNC_STAT_ISO_STAT_MASK), 1, 10000);
+				 !(val & FUNC_STAT_SSAR_STAT_MASK), 1, 10000);
 	if (ret) {
 		dev_err(domain->dev, "pd_on timeout: name: %s, stat: %x\n", genpd->name, val);
 		return ret;
@@ -72,7 +73,7 @@ static int imx93_pd_off(struct generic_pm_domain *genpd)
 	writel(val, addr + MIX_SLICE_SW_CTRL_OFF);
 
 	ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val,
-				 val & FUNC_STAT_PSW_STAT_MASK, 1, 1000);
+				 val & FUNC_STAT_PSW_STAT_MASK, 1, 10000);
 	if (ret) {
 		dev_err(domain->dev, "pd_off timeout: name: %s, stat: %x\n", genpd->name, val);
 		return ret;
-- 
2.37.1