linux-kernel - [PATCH 1/3] i2c: imx: Fix reset of I2SR

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Message-ID: <20200917122029.11121-2-ceggers@arri.de>
Date:   Thu, 17 Sep 2020 14:20:27 +0200
From:   Christian Eggers <ceggers@...i.de>
To:     Oleksij Rempel <linux@...pel-privat.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>
CC:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        <linux-i2c@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Christian Eggers <ceggers@...i.de>,
        <stable@...r.kernel.org>
Subject: [PATCH 1/3] i2c: imx: Fix reset of I2SR_IAL flag

According to the "VFxxx Controller Reference Manual" (and the comment
block starting at line 97), Vybrid requires writing a one for clearing
an interrupt flag. Syncing with the method for clearing I2SR_IIF in
i2c_imx_isr().

Signed-off-by: Christian Eggers <ceggers@...i.de>
Cc: stable@...r.kernel.org
---
 drivers/i2c/busses/i2c-imx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 0ab5381aa012..d8b2e632dd10 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -425,6 +425,7 @@ static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy, bool a
 		/* check for arbitration lost */
 		if (temp & I2SR_IAL) {
 			temp &= ~I2SR_IAL;
+			temp |= (i2c_imx->hwdata->i2sr_clr_opcode & I2SR_IAL);
 			imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR);
 			return -EAGAIN;
 		}
-- 
Christian Eggers
Embedded software developer

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