linux-kernel - [PATCH 5.4 067/165] bus: ti-sysc: Fix missing reset delay handling

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Message-Id: <20200111094926.742694728@linuxfoundation.org>
Date:   Sat, 11 Jan 2020 10:49:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Keerthy <j-keerthy@...com>,
        Tony Lindgren <tony@...mide.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 067/165] bus: ti-sysc: Fix missing reset delay handling

From: Tony Lindgren <tony@...mide.com>

[ Upstream commit e709ed70d122e94cb426b1e1f905829eae19a009 ]

We have dts property for "ti,sysc-delay-us", and we're using it, but the
wait after OCP softreset only happens if devices are probed in legacy mode.

Let's add a delay after writing the OCP softreset when specified.

Fixes: e0db94fe87da ("bus: ti-sysc: Make OCP reset work for sysstatus and sysconfig reset bits")
Cc: Keerthy <j-keerthy@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/bus/ti-sysc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 2b6670daf7fc..34bd9bf4e68a 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -1594,6 +1594,10 @@ static int sysc_reset(struct sysc *ddata)
 	sysc_val |= sysc_mask;
 	sysc_write(ddata, sysc_offset, sysc_val);
 
+	if (ddata->cfg.srst_udelay)
+		usleep_range(ddata->cfg.srst_udelay,
+			     ddata->cfg.srst_udelay * 2);
+
 	if (ddata->clk_enable_quirk)
 		ddata->clk_enable_quirk(ddata);
 
-- 
2.20.1