From: Javier Martinez Canillas <javier@osg.samsung.com>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: Tony Lindgren <tony@atomide.com>,
linux-i2c@vger.kernel.org,
Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
Linux Media Mailing List <linux-media@vger.kernel.org>,
linux-pm@vger.kernel.org, Alan Stern <stern@rowland.harvard.edu>
Subject: Re: tvp5150 regression after commit 9f924169c035
Date: Thu, 14 Apr 2016 10:27:34 -0400 [thread overview]
Message-ID: <570FA8D6.5070308@osg.samsung.com> (raw)
In-Reply-To: <20160414141945.GA1539@katana>
Hello Wofram,
On 04/14/2016 10:19 AM, Wolfram Sang wrote:
>
>> Yes, I also wonder why I'm the only one facing this issue... maybe no one
>> else is using the tvp5150 driver on an OMAP board with mainline?
>
> I wonder why it only affects tvp5150. I don't see the connection yet.
>
Yes, me neither. All other I2C devices are working properly on this board.
The only thing I can think, is that the tvp5150 needs a reset sequence in
order to be operative. It basically toggles two pins in the chip, this is
done in tvp5150_init() [0] and is needed before accessing I2C registers.
Maybe runtime pm has an effect on this and the chip is not reset correctly?
[0]: https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/drivers/media/i2c/tvp5150.c#n1311
Best regards,
--
Javier Martinez Canillas
Open Source Group
Samsung Research America
next prev parent reply other threads:[~2016-04-14 14:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 13:46 tvp5150 regression after commit 9f924169c035 Javier Martinez Canillas
2016-02-03 14:23 ` Wolfram Sang
2016-02-03 14:42 ` Javier Martinez Canillas
2016-02-08 10:54 ` Wolfram Sang
2016-02-12 22:09 ` Javier Martinez Canillas
2016-02-12 22:13 ` Tony Lindgren
2016-02-12 22:28 ` Javier Martinez Canillas
2016-02-12 22:40 ` Tony Lindgren
2016-02-12 23:08 ` Javier Martinez Canillas
2016-02-12 23:46 ` Tony Lindgren
2016-02-13 2:47 ` Javier Martinez Canillas
2016-04-12 22:32 ` Wolfram Sang
2016-04-13 22:39 ` Javier Martinez Canillas
2016-04-14 11:12 ` Wolfram Sang
2016-04-14 13:41 ` Javier Martinez Canillas
2016-04-14 14:19 ` Wolfram Sang
2016-04-14 14:27 ` Javier Martinez Canillas [this message]
2016-04-14 15:12 ` Tony Lindgren
2016-04-14 23:59 ` Javier Martinez Canillas
2016-04-15 14:58 ` Tony Lindgren
2016-04-15 16:48 ` Javier Martinez Canillas
2016-04-15 17:08 ` Tony Lindgren
2016-02-12 22:22 ` Wolfram Sang
2016-02-12 22:26 ` Javier Martinez Canillas
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