linux-kernel - [PATCH 7/7 v4] i2c-eg20t: Add initialize processing in case i2c-error occurs

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Message-Id: <1318392786-23610-7-git-send-email-tomoya-linux@dsn.lapis-semi.com>
Date:	Wed, 12 Oct 2011 13:13:06 +0900
From:	Tomoya MORINAGA <tomoya-linux@....lapis-semi.com>
To:	Jean Delvare <khali@...ux-fr.org>, Ben Dooks <ben-linux@...ff.org>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Qi Wang <qi.wang@...el.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com, jeffchu@...adcom.com,
	Tomoya MORINAGA <tomoya-linux@....lapis-semi.com>
Subject: [PATCH 7/7 v4] i2c-eg20t: Add initialize processing in case i2c-error occurs

In case disconnecting physical connection,
need to initialize i2c device for retry access.
This patch adds initialize process in case bus-idle fails and Lost arbitration.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@....lapis-semi.com>
---
 drivers/i2c/busses/i2c-eg20t.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index e25b8eb..5521099 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -292,6 +292,7 @@ static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap,
 
 	pch_dbg(adap, "I2CSR = %x\n", ioread32(p + PCH_I2CSR));
 	pch_err(adap, "%s: Timeout Error.return%d\n", __func__, -ETIME);
+	pch_i2c_init(adap);
 
 	return -ETIME;
 }
@@ -459,6 +460,7 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
 		pch_err(adap, "Lost Arbitration\n");
 		pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
 		pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
+		pch_i2c_init(adap);
 		return -EAGAIN;
 	} else { /* wait-event timeout */
 		pch_i2c_stop(adap);
@@ -637,6 +639,7 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
 		pch_err(adap, "Lost Arbitration\n");
 		pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
 		pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
+		pch_i2c_init(adap);
 		return -EAGAIN;
 	} else { /* wait-event timeout */
 		pch_i2c_stop(adap);
-- 
1.7.4.4

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