linux-kernel - [PATCH v2 2/5] i2c: mt7621: clear pending interrupt on i2c reset

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Message-ID: <20250721180710.2116-3-ansuelsmth@gmail.com>
Date: Mon, 21 Jul 2025 20:05:53 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Stefan Roese <sr@...x.de>,
	Andi Shyti <andi.shyti@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-i2c@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Cc: Christian Marangi <ansuelsmth@...il.com>
Subject: [PATCH v2 2/5] i2c: mt7621: clear pending interrupt on i2c reset

On resetting the i2c bus, clear any pending interrupt to have a more
consistent state on the next operation.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/i2c/busses/i2c-mt7621.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/busses/i2c-mt7621.c b/drivers/i2c/busses/i2c-mt7621.c
index c0e13f9af3e5..58c3da92cea3 100644
--- a/drivers/i2c/busses/i2c-mt7621.c
+++ b/drivers/i2c/busses/i2c-mt7621.c
@@ -101,6 +101,8 @@ static void mtk_i2c_reset(struct mtk_i2c *i2c)
 	iowrite32(((i2c->clk_div << 16) & SM0CTL0_CLK_DIV_MASK) | SM0CTL0_EN |
 		  SM0CTL0_SCL_STRETCH, i2c->base + REG_SM0CTL0_REG);
 	iowrite32(0, i2c->base + REG_SM0CFG2_REG);
+	/* Clear any pending interrupt */
+	iowrite32(1, i2c->base + REG_PINTEN_REG);
 }
 
 static void mtk_i2c_dump_reg(struct mtk_i2c *i2c)
-- 
2.50.0