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Message-Id: <1318392786-23610-1-git-send-email-tomoya-linux@dsn.lapis-semi.com>
Date: Wed, 12 Oct 2011 13:13:00 +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 1/7 v4] i2c-eg20t: Fix bus-idle waiting issue
Currently, when checking whether bus is idle or not,
if timeout occurs,
this function always returns success(zero).
This patch fixes the issue.
Signed-off-by: Tomoya MORINAGA <tomoya-linux@....lapis-semi.com>
---
drivers/i2c/busses/i2c-eg20t.c | 18 +++++++++---------
1 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 2ab238b..d1cd304 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -276,23 +276,23 @@ static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap,
s32 timeout)
{
void __iomem *p = adap->pch_base_address;
+ ktime_t ns_val;
+
+ if ((ioread32(p + PCH_I2CSR) & I2CMBB_BIT) == 0)
+ return 0;
/* MAX timeout value is timeout*1000*1000nsec */
- ktime_t ns_val = ktime_add_ns(ktime_get(), timeout*1000*1000);
+ ns_val = ktime_add_ns(ktime_get(), timeout*1000*1000);
do {
- if ((ioread32(p + PCH_I2CSR) & I2CMBB_BIT) == 0)
- break;
msleep(20);
+ if ((ioread32(p + PCH_I2CSR) & I2CMBB_BIT) == 0)
+ return 0;
} while (ktime_lt(ktime_get(), ns_val));
pch_dbg(adap, "I2CSR = %x\n", ioread32(p + PCH_I2CSR));
+ pch_err(adap, "%s: Timeout Error.return%d\n", __func__, -ETIME);
- if (timeout == 0) {
- pch_err(adap, "%s: Timeout Error.return%d\n", __func__, -ETIME);
- return -ETIME;
- }
-
- return 0;
+ return -ETIME;
}
/**
--
1.7.4.4
--
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