linux-kernel - [PATCH 4/4] soc: rockchip: io-domain: do more thing about regulator notify

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Message-Id: <20210816032003.1162779-5-jay.xu@rock-chips.com>
Date:   Mon, 16 Aug 2021 11:20:03 +0800
From:   Jianqun Xu <jay.xu@...k-chips.com>
To:     lgirdwood@...il.com, broonie@...nel.org, ulf.hansson@...aro.org,
        lee.jones@...aro.org, zhangchangzhong@...wei.com, heiko@...ech.de
Cc:     linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jianqun Xu <jay.xu@...k-chips.com>
Subject: [PATCH 4/4] soc: rockchip: io-domain: do more thing about regulator notify

Do a fix to rockchip io-domain, follow this orders:

* system running state
  -> io-domain vsel to 3.3V
    -> regulator_enable
      -> vsel change according to regulator voltage

* system running state
  -> io-domain vsel to 3.3V
    -> regulator_disable

Found on some Rockchip SoCs, the regulator enable or disable without
care about the io-domain maybe caused soc damaged.

Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>
---
 drivers/soc/rockchip/io-domain.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/soc/rockchip/io-domain.c b/drivers/soc/rockchip/io-domain.c
index cf8182fc3642..af5fb11ad9a3 100644
--- a/drivers/soc/rockchip/io-domain.c
+++ b/drivers/soc/rockchip/io-domain.c
@@ -123,6 +123,12 @@ static int rockchip_iodomain_notify(struct notifier_block *nb,
 	} else if (event & (REGULATOR_EVENT_VOLTAGE_CHANGE |
 			    REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE)) {
 		uV = (unsigned long)data;
+	} else if (event & REGULATOR_EVENT_PRE_ENABLE) {
+		uV = MAX_VOLTAGE_3_3;
+	} else if (event & REGULATOR_EVENT_PRE_DISABLE) {
+		uV = MAX_VOLTAGE_3_3;
+	} else if (event & REGULATOR_EVENT_ENABLE) {
+		uV = (unsigned long)data;
 	} else {
 		return NOTIFY_OK;
 	}
-- 
2.25.1