linux-kernel - [PATCH 2/5] phy: tegra: xusb: Skip single function lane programming

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Message-Id: <20190125112525.10697-2-thierry.reding@gmail.com>
Date:   Fri, 25 Jan 2019 12:25:22 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>, JC Kuo <jckuo@...dia.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] phy: tegra: xusb: Skip single function lane programming

From: JC Kuo <jckuo@...dia.com>

Tegra186 USB2 pads and USB3 pads do not have hardware mux for changing
the pad function. For such "lanes", we can skip the lane mux register
programming.

Signed-off-by: JC Kuo <jckuo@...dia.com>
Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/phy/tegra/xusb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 5b3b8863363e..e3bc60cfe6a1 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2015, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2016, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -313,6 +313,10 @@ static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane)
 	const struct tegra_xusb_lane_soc *soc = lane->soc;
 	u32 value;
 
+	/* skip single function lanes */
+	if (soc->num_funcs < 2)
+		return;
+
 	/* choose function */
 	value = padctl_readl(padctl, soc->offset);
 	value &= ~(soc->mask << soc->shift);
-- 
2.19.1