linux-kernel - [PATCHv3 05/16] OMAP: I2C: Fix the interrupt clearing in OMAP4

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Message-ID: <1333122611-29953-6-git-send-email-shubhrajyoti@ti.com>
Date:	Fri, 30 Mar 2012 21:20:00 +0530
From:	Shubhrajyoti D <shubhrajyoti@...com>
To:	<linux-i2c@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>,
	Shubhrajyoti D <shubhrajyoti@...com>,
	Vikram Pandita <vikram.pandita@...com>
Subject: [PATCHv3 05/16] OMAP: I2C: Fix the interrupt clearing in OMAP4

On OMAP4 we were writing 1 to IRQENABLE_CLR which cleared only
the arbitration lost interrupt. The patch intends to fix the same by writing 0
to the IE register clearing all interrupts.

This is based on the work done by Vikram Pandita <vikram.pandita@...com>.

The  changes from the original patch ...
-  Does not use the IRQENABLE_CLR register to clear as it is not mentioned
  to be legacy register IRQENABLE_CLR helps in  atomically
  setting/clearing specific interrupts, instead use the OMAP_I2C_IE_REG as we are
  clearing all interrupts.

Cc: Vikram Pandita <vikram.pandita@...com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@...com>
---
 drivers/i2c/busses/i2c-omap.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index f39d591..1c38572 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -1179,10 +1179,8 @@ static int omap_i2c_runtime_suspend(struct device *dev)
 		_dev->dev_lost_count = _dev->get_context_loss_count(dev);
 
 	_dev->iestate = omap_i2c_read_reg(_dev, OMAP_I2C_IE_REG);
-	if (_dev->dtrev == OMAP_I2C_IP_VERSION_2)
-		omap_i2c_write_reg(_dev, OMAP_I2C_IP_V2_IRQENABLE_CLR, 1);
-	else
-		omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, 0);
+
+	omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, 0);
 
 	if (_dev->rev < OMAP_I2C_OMAP1_REV_2) {
 		iv = omap_i2c_read_reg(_dev, OMAP_I2C_IV_REG); /* Read clears */
-- 
1.7.1

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