linux-kernel - [PATCH] pinctrl: mediatek: Fix fallback behavior for bias_set

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Message-Id: <20210701065439.2527790-1-hsinyi@chromium.org>
Date:   Thu,  1 Jul 2021 14:54:39 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Sean Wang <sean.wang@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        zhiyong.tao@...iatek.com
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] pinctrl: mediatek: Fix fallback behavior for bias_set_combo

Some pin doesn't support PUPD register, if it fails and fallbacks with
bias_set_combo case, it will call mtk_pinconf_bias_set_pupd_r1_r0() to
modify the PUPD pin again.

Since the general bias set are either PU/PD or PULLSEL/PULLEN, try
bias_set or bias_set_rev1 for this fallback case.

Fixes: 81bd1579b43e ("pinctrl: mediatek: Fix fallback call path")
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
 drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index 5b3b048725cc8..0cdff487836fa 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -926,9 +926,12 @@ int mtk_pinconf_adv_pull_set(struct mtk_pinctrl *hw,
 			if (err)
 				return err;
 		} else if (hw->soc->bias_set_combo) {
-			err = hw->soc->bias_set_combo(hw, desc, pullup, arg);
-			if (err)
-				return err;
+			err = mtk_pinconf_bias_set_rev1(hw, desc, pullup);
+			if (err) {
+				err = mtk_pinconf_bias_set(hw, desc, pullup);
+				if (err)
+					return err;
+			}
 		} else {
 			return -ENOTSUPP;
 		}
-- 
2.32.0.93.g670b81a890-goog