linux-kernel - [PATCH 1/2] pinctrl: mediatek: common: add quirk for broken set/clr modes

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Date:   Mon, 30 May 2022 14:34:24 +0200
From:   Fabien Parent <fparent@...libre.com>
To:     Sean Wang <sean.wang@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Fabien Parent <fparent@...libre.com>,
        linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] pinctrl: mediatek: common: add quirk for broken set/clr modes

On MT8365, the SET/CLR of the mode is broken and some pin modes won't
be set correctly. Add a quirk for such SoCs, so that instead of using
the SET/CLR register use the main R/W register
to read/update/write the modes.

Signed-off-by: Fabien Parent <fparent@...libre.com>
---
 drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 46 ++++++++++++-------
 drivers/pinctrl/mediatek/pinctrl-mtk-common.h |  3 ++
 2 files changed, 33 insertions(+), 16 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index f25b3e09386b..156627d9c552 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -330,23 +330,37 @@ static int mtk_pconf_set_pull_select(struct mtk_pinctrl *pctl,
 		return -EINVAL;
 	}
 
-	bit = BIT(pin & pctl->devdata->mode_mask);
-	if (enable)
-		reg_pullen = SET_ADDR(mtk_get_port(pctl, pin) +
-			pctl->devdata->pullen_offset, pctl);
-	else
-		reg_pullen = CLR_ADDR(mtk_get_port(pctl, pin) +
-			pctl->devdata->pullen_offset, pctl);
-
-	if (isup)
-		reg_pullsel = SET_ADDR(mtk_get_port(pctl, pin) +
-			pctl->devdata->pullsel_offset, pctl);
-	else
-		reg_pullsel = CLR_ADDR(mtk_get_port(pctl, pin) +
-			pctl->devdata->pullsel_offset, pctl);
+	if (pctl->devdata->quirks & MTK_PINCTRL_MODE_SET_CLR_BROKEN) {
+		bit = pin & pctl->devdata->mode_mask;
+		reg_pullen = mtk_get_port(pctl, pin) +
+				pctl->devdata->pullen_offset;
+		reg_pullsel = mtk_get_port(pctl, pin) +
+				pctl->devdata->pullsel_offset;
+
+		regmap_update_bits(mtk_get_regmap(pctl, pin), reg_pullen,
+			BIT(bit), enable << bit);
+		regmap_update_bits(mtk_get_regmap(pctl, pin), reg_pullsel,
+			BIT(bit), isup << bit);
+	} else {
+		bit = BIT(pin & pctl->devdata->mode_mask);
+		if (enable)
+			reg_pullen = SET_ADDR(mtk_get_port(pctl, pin) +
+				pctl->devdata->pullen_offset, pctl);
+		else
+			reg_pullen = CLR_ADDR(mtk_get_port(pctl, pin) +
+				pctl->devdata->pullen_offset, pctl);
+
+		if (isup)
+			reg_pullsel = SET_ADDR(mtk_get_port(pctl, pin) +
+				pctl->devdata->pullsel_offset, pctl);
+		else
+			reg_pullsel = CLR_ADDR(mtk_get_port(pctl, pin) +
+				pctl->devdata->pullsel_offset, pctl);
+
+		regmap_write(mtk_get_regmap(pctl, pin), reg_pullen, bit);
+		regmap_write(mtk_get_regmap(pctl, pin), reg_pullsel, bit);
+	}
 
-	regmap_write(mtk_get_regmap(pctl, pin), reg_pullen, bit);
-	regmap_write(mtk_get_regmap(pctl, pin), reg_pullsel, bit);
 	return 0;
 }
 
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
index 6fe8564334c9..cc0dce8818c6 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
@@ -22,6 +22,8 @@
 
 #define MTK_PINCTRL_NOT_SUPPORT	(0xffff)
 
+#define MTK_PINCTRL_MODE_SET_CLR_BROKEN   BIT(0)
+
 struct mtk_desc_function {
 	const char *name;
 	unsigned char muxval;
@@ -271,6 +273,7 @@ struct mtk_pinctrl_devdata {
 	unsigned int mode_mask;
 	unsigned int mode_per_reg;
 	unsigned int mode_shf;
+	unsigned long quirks;
 };
 
 struct mtk_pinctrl {
-- 
2.36.1