linux-kernel - Re: stable regression: tda18271_read_regs: [1-0060|M] ERROR: i2c

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Date:	Mon, 16 Dec 2013 20:57:48 +0100
From:	Frederik Himpe <fhimpe@...enet.be>
To:	Mauro Carvalho Chehab <m.chehab@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: stable regression: tda18271_read_regs: [1-0060|M] ERROR:
 i2c_transfer returned: -19

On za, 2013-12-14 at 09:24 -0200, Mauro Carvalho Chehab wrote:
> Em Fri, 13 Dec 2013 22:19:39 +0100
> Frederik Himpe <fhimpe@...enet.be> escreveu:
> 
> > [My excuses for multiposting, it seems gmane does not permit posting to all
> > the relevant lists]
> > 
> > Since upgrading my system from Linux 3.12 to 3.12.3, my PCTV Systems
> > nanoStick T2 290e does not work anymore.
> > 
> > This happens with 3.12.3:
> > 

> > [    3.844020] tda18271 1-0060: creating new instance
> > [    3.868422] tda18271_read_regs: [1-0060|M] ERROR: i2c_transfer returned: -19
> > [    3.868492] Error reading device ID @ 1-0060, bailing out.
> > [    3.868548] tda18271_attach: [1-0060|M] error -5 on line 1285
> > [    3.868603] tda18271 1-0060: destroying instance
> > [    3.868666] Em28xx: Initialized (Em28xx dvb Extension) extension
> > [    3.894687] Registered IR keymap rc-pinnacle-pctv-hd
> > [    3.894819] input: em28xx IR (em28174 #0) as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.7/rc/rc0/input23
> > [    3.894979] rc0: em28xx IR (em28174 #0) as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.7/rc/rc0
> > [    3.895570] Em28xx: Initialized (Em28xx Input Extension) extension
> > 
> > I see the same problem reported here:
> > https://github.com/Hexxeh/rpi-firmware/issues/38 where it is mentioned
> > that this regression also appeared in 3.10 stable series recently.
> > 
> > I noticed upstream commit 8393796dfa4cf5dffcceec464c7789bec3a2f471
> > (media: dvb-frontends: Don't use dynamic static allocation)
> > entered both 3.10.22 (which is the first version introducing the
> > regression in 3.10 stable according to the linked bug), and 3.12.3.
> > This file contains stuff related to tda18271. Could this be the 
> > culprit?
> > 
> 
> Well, for board EM28174_BOARD_PCTV_290E, it first attaches cxd2820r
> and then the tuner tda18271.
> 
> I suspect that the issue is at cxd2820r. Could you please apply this
> patch:
> 	http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0db3fa2741ad8371c21b3a6785416a4afc0cc1d4 
> and see if it solves the issue?

I have applied this patch to 3.12.5 and I can confirm it works fine now.
Can this patch be applied to the stable series in order to fix this
regression in stable?


-- 
Frederik Himpe <fhimpe@...enet.be>

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