From: Antti Palosaari <crope@iki.fi>
To: "Antti Seppälä" <a.seppala@gmail.com>,
"Benjamin Larsson" <benjamin@southpole.se>
Cc: linux-media@vger.kernel.org
Subject: Re: [RFC PATCH] mn88472: reduce firmware download chunk size
Date: Thu, 19 Feb 2015 17:38:32 +0200 [thread overview]
Message-ID: <54E60378.6030604@iki.fi> (raw)
In-Reply-To: <CAKv9HNaSqgFpC+TmMm86Y7mrgXvZ9U+wqdgjM4n=hf80p2W1jg@mail.gmail.com>
On 02/19/2015 12:21 PM, Antti Seppälä wrote:
> On 19 February 2015 at 11:43, Benjamin Larsson <benjamin@southpole.se> wrote:
>> On 2015-02-19 10:13, Antti Seppälä wrote:
>>>
>>> It seems that currently the firmware download on the mn88472 is
>>> somehow wrong for my Astrometa HD-901T2.
>>>
>>> Reducing the download chunk size (mn88472_config.i2c_wr_max) to 2
>>> makes the firmware download consistently succeed.
>>>
>>
>>
>> Hi, try adding the workaround patch I sent for this.
>>
>> [PATCH 1/3] rtl28xxu: lower the rc poll time to mitigate i2c transfer errors
>>
>> I now see that it hasn't been merged. But I have been running with this
>> patch for a few months now without any major issues.
>>
>
> The patch really did improve firmware loading. Weird...
>
> Even with it I still get occasional i2c errors from r820t:
>
> [ 15.874402] r820t 8-003a: r820t_write: i2c wr failed=-32 reg=0a len=1: da
> [ 81.455517] r820t 8-003a: r820t_read: i2c rd failed=-32 reg=00
> len=4: 69 74 e6 df
> [ 99.949702] r820t 8-003a: r820t_read: i2c rd failed=-32 reg=00
> len=4: 69 74 e6 df
>
> These errors seem to appear more often if I'm reading the signal
> strength values using e.g. femon.
Could you disable whole IR polling and test
modprobe dvb_usb_v2 disable_rc_polling=1
It is funny that *increasing* RC polling makes things better, though...
regards
Antti
--
http://palosaari.fi/
next prev parent reply other threads:[~2015-02-19 15:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-19 9:13 [RFC PATCH] mn88472: reduce firmware download chunk size Antti Seppälä
2015-02-19 9:43 ` Benjamin Larsson
2015-02-19 10:21 ` Antti Seppälä
2015-02-19 11:53 ` Benjamin Larsson
2015-02-19 15:38 ` Antti Palosaari [this message]
2015-02-19 16:01 ` Antti Seppälä
2015-02-19 16:14 ` Antti Palosaari
2015-02-19 16:25 ` Steven Toth
2015-02-19 16:44 ` Antti Palosaari
2015-02-19 18:42 ` Antti Seppälä
2015-02-19 20:32 ` Antti Palosaari
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