linux-kernel - [PATCH v8 02/21] pinctrl: tegra: Add write barrier after all pinctrl register writes

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Message-ID: <1565308020-31952-3-git-send-email-skomatineni@nvidia.com>
Date:   Thu, 8 Aug 2019 16:46:41 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <tglx@...utronix.de>, <jason@...edaemon.net>,
        <marc.zyngier@....com>, <linus.walleij@...aro.org>,
        <stefan@...er.ch>, <mark.rutland@....com>
CC:     <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
        <sboyd@...nel.org>, <linux-clk@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, <jckuo@...dia.com>,
        <josephl@...dia.com>, <talho@...dia.com>, <skomatineni@...dia.com>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <mperttunen@...dia.com>, <spatra@...dia.com>, <robh+dt@...nel.org>,
        <digetx@...il.com>, <devicetree@...r.kernel.org>,
        <rjw@...ysocki.net>, <viresh.kumar@...aro.org>,
        <linux-pm@...r.kernel.org>
Subject: [PATCH v8 02/21] pinctrl: tegra: Add write barrier after all pinctrl register writes

This patch adds write barrier after all pinctrl register writes
during resume to make sure all pinctrl changes are complete.

Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
---
 drivers/pinctrl/tegra/pinctrl-tegra.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
index 982ee634b3b1..f49fe29fb6df 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra.c
@@ -677,6 +677,8 @@ static int tegra_pinctrl_resume(struct device *dev)
 			writel_relaxed(*backup_regs++, regs++);
 	}
 
+	/* make sure all the pinmux register writes are complete */
+	wmb();
 	return 0;
 }
 
-- 
2.7.4