From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Subject: Re: [PATCH v3] ARM: tegra: ventana: enable internal display Date: Mon, 19 Nov 2012 22:08:20 -0700 Message-ID: <50AB1044.5030704@wwwdotorg.org> References: <1353318187-26484-1-git-send-email-acourbot@nvidia.com> <50AADEE5.2030302@nvidia.com> <6034130.4mMqBdPRel@percival> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <6034130.4mMqBdPRel@percival> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Alex Courbot Cc: Mark Zhang , Thierry Reding , "linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "gnurou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" List-Id: linux-tegra@vger.kernel.org On 11/19/2012 06:47 PM, Alex Courbot wrote: > On Tuesday 20 November 2012 09:37:41 Mark Zhang wrote: >> Great. So this means I2C2 is used for LCD and HDMI both. While HDMI is >> not plugged, the EDID of LCD will be checked out, right? > > Ahhh. So that's why the LCD DDC was not working during my previous tests - I > had HDMI nodes in my DT as well as the HDMI cable plugged! Indeed, things seem > to work as you described. I assumed the i2cmux node would set the right pin > configuration according to whether we want to read the LCD or HDMI DDC, but > apparently this is not totally working yet. Glad we figured it out. Adding the > HDMI nodes to Ventana will probably require to fix this (along with other > things, probably) first. That is kinda the whole point of the I2C mux... If it really isn't working, can you please investigate why. i2cdump or i2cget would be useful tools for testing this.