linux-kernel - [PATCH 5.4 019/203] pinctrl: meson: Fix wrong shift value when get drive-strength

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Date:   Fri, 17 Jan 2020 00:15:36 +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, Qianggui Song <qianggui.song@...ogic.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 5.4 019/203] pinctrl: meson: Fix wrong shift value when get drive-strength

From: Qianggui Song <qianggui.song@...ogic.com>

commit 35c60be220572de7d6605c4318f640d133982040 upstream.

In meson_pinconf_get_drive_strength, variable bit is calculated by
meson_calc_reg_and_bit, this value is the offset from the first pin of a
certain bank to current pin, while Meson SoCs use two bits for each pin
to depict drive-strength. So a left shift by 1 should be done or node
pinconf-pins shows wrong message.

Fixes: 6ea3e3bbef37 ("pinctrl: meson: add support of drive-strength-microamp")

Signed-off-by: Qianggui Song <qianggui.song@...ogic.com>
Link: https://lore.kernel.org/r/20191226023734.9631-1-qianggui.song@amlogic.com
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pinctrl/meson/pinctrl-meson.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/pinctrl/meson/pinctrl-meson.c
+++ b/drivers/pinctrl/meson/pinctrl-meson.c
@@ -441,6 +441,7 @@ static int meson_pinconf_get_drive_stren
 		return ret;
 
 	meson_calc_reg_and_bit(bank, pin, REG_DS, &reg, &bit);
+	bit = bit << 1;
 
 	ret = regmap_read(pc->reg_ds, reg, &val);
 	if (ret)