linux-kernel - [PATCH 6/7] V4L/DVB (4784): [saa7146_i2c] short

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Date:	Fri, 03 Nov 2006 01:02:14 -0300
From:	mchehab@...radead.org
To:	linux-kernel@...r.kernel.org
Cc:	linux-dvb-maintainer@...uxtv.org,
	Oliver Endriss <o.endriss@....de>,
	Mauro Carvalho Chehab <mchehab@...radead.org>
Subject: [PATCH 6/7] V4L/DVB (4784): [saa7146_i2c] short_delay mode fixed
	for fast machines


From: Oliver Endriss <o.endriss@....de>

TT DVB-C 2300 runs at 137 kHz I2C speed. short_delay mode did not work
reliably on fast machines with that speed. Increased max loop count from
20 to 50. Moved dummy access out of the loop.

Signed-off-by: Oliver Endriss <o.endriss@....de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...radead.org>
---

 drivers/media/common/saa7146_i2c.c |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/media/common/saa7146_i2c.c b/drivers/media/common/saa7146_i2c.c
index d9953f7..5297a36 100644
--- a/drivers/media/common/saa7146_i2c.c
+++ b/drivers/media/common/saa7146_i2c.c
@@ -217,11 +217,9 @@ static int saa7146_i2c_writeout(struct s
 		}
 		/* wait until we get a transfer done or error */
 		timeout = jiffies + HZ/100 + 1; /* 10ms */
+		/* first read usually delivers bogus results... */
+		saa7146_i2c_status(dev);
 		while(1) {
-			/**
-			 *  first read usually delivers bogus results...
-			 */
-			saa7146_i2c_status(dev);
 			status = saa7146_i2c_status(dev);
 			if ((status & 0x3) != 1)
 				break;
@@ -232,10 +230,10 @@ static int saa7146_i2c_writeout(struct s
 				DEB_I2C(("saa7146_i2c_writeout: timed out waiting for end of xfer\n"));
 				return -EIO;
 			}
-			if ((++trial < 20) && short_delay)
+			if (++trial < 50 && short_delay)
 				udelay(10);
 			else
-			msleep(1);
+				msleep(1);
 		}
 	}
 

-
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