linux-kernel - Re: [PATCH V2 2/2] apple_gmux: Add support for newer hardware

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Date:	Tue, 14 Aug 2012 16:53:47 +0200
From:	Bernhard Froemel <froemel@...rs.tuwien.ac.at>
To:	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH V2 2/2] apple_gmux: Add support for newer hardware

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Only in relation to Seth's future apple-gmux patch series about
vgaswitcheroo and restoring the gmux device configuration across
suspend/resume [1]:
On resume the gmux registers 0x28 (DDC) and 0x10 (SWITCH_DISPLAY)
(i.e., the first two writes) are not restored (result: the screen
remains black after suspend/resume).

Of course, this does not happen with my patch proposal ;)
Unfortunately, I have not the time to sort this out in the next couple
of days -- on the other hand this is probably not a problem w.r.t.
this patch, but needs to be taken care of in Seth's patch series.

Bernhard

[1] http://people.canonical.com/~sforshee/apple-gmux-patches/


On 08/14/2012 04:05 PM, Bernhard Froemel wrote:
> Please reduce the delay in the gmux_index_wait_[ready|complete] 
> functions: 100ms is way too long. 1 ms is more than enough. I
> never experienced any problems with 100 us.
> 
> The version information can also be extracted in the new gmux
> device (see my initial patch proposal).
> 
> Bernhard
> 
> On 08/14/2012 02:46 AM, Seth Forshee wrote:
>> On Mon, Aug 13, 2012 at 06:52:49PM -0400, Matthew Garrett wrote:
>>> New gmux devices have a different method for accessing the 
>>> registers. Update the driver to cope. Incorporates feedback
>>> from Bernhard Froemel.
>>> 
>>> Signed-off-by: Matthew Garrett <mjg@...hat.com> Cc: Bernhard 
>>> Froemel <froemel@...rs.tuwien.ac.at> Cc: Seth Forshee 
>>> <seth.forshee@...onical.com>
> 
>> Acked-by: Seth Forshee <seth.forshee@...onical.com>
> 
> 
> 

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