linux-kernel - [PATCH v1 10/13] soc: mediatek: mtk-svs: restore default voltages when svs init02 fail

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Date:   Mon, 26 Dec 2022 17:42:45 +0800
From:   Roger Lu <roger.lu@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Enric Balletbo Serra <eballetbo@...il.com>,
        Kevin Hilman <khilman@...nel.org>,
        Nicolas Boichat <drinkcat@...gle.com>
CC:     Fan Chen <fan.chen@...iatek.com>, Roger Lu <roger.lu@...iatek.com>,
        Jia-wei Chang <jia-wei.chang@...iatek.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v1 10/13] soc: mediatek: mtk-svs: restore default voltages when svs init02 fail

If svs init02 fail, it means we cannot rely on svs bank voltages anymore.
We need to disable svs function and restore DVFS opp voltages back to the
default voltages for making sure we have enough DVFS voltages.

Signed-off-by: Roger Lu <roger.lu@...iatek.com>
---
 drivers/soc/mediatek/mtk-svs.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
index c4b36c908eda..3a2be5ced8e6 100644
--- a/drivers/soc/mediatek/mtk-svs.c
+++ b/drivers/soc/mediatek/mtk-svs.c
@@ -1467,6 +1467,7 @@ static int svs_init02(struct svs_platform *svsp)
 {
 	struct svs_bank *svsb;
 	unsigned long flags, time_left;
+	int ret;
 	u32 idx;
 
 	for (idx = 0; idx < svsp->bank_max; idx++) {
@@ -1485,7 +1486,8 @@ static int svs_init02(struct svs_platform *svsp)
 							msecs_to_jiffies(5000));
 		if (!time_left) {
 			dev_err(svsb->dev, "init02 completion timeout\n");
-			return -EBUSY;
+			ret = -EBUSY;
+			goto out_of_init02;
 		}
 	}
 
@@ -1503,12 +1505,21 @@ static int svs_init02(struct svs_platform *svsp)
 		if (svsb->type == SVSB_HIGH || svsb->type == SVSB_LOW) {
 			if (svs_sync_bank_volts_from_opp(svsb)) {
 				dev_err(svsb->dev, "sync volt fail\n");
-				return -EPERM;
+				ret = -EPERM;
+				goto out_of_init02;
 			}
 		}
 	}
 
 	return 0;
+
+out_of_init02:
+	for (idx = 0; idx < svsp->bank_max; idx++) {
+		svsb = &svsp->banks[idx];
+		svs_bank_disable_and_restore_default_volts(svsp, svsb);
+	}
+
+	return ret;
 }
 
 static void svs_mon_mode(struct svs_platform *svsp)
-- 
2.18.0