From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steev Klimaszewski Subject: Re: [PATCH] ARM: tegra: Fix nyan-big panel binding Date: Sun, 19 Jul 2015 22:26:52 -0500 Message-ID: <1437362812.8225.13.camel@gentoo.org> References: <1437336913-12886-1-git-send-email-steev@gentoo.org> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Dylan Reid , Steev Klimaszewski Cc: Stephen Warren , Thierry Reding , Alexandre Courbot , "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , "linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-tegra@vger.kernel.org On Sun, 2015-07-19 at 16:43 -0600, Dylan Reid wrote: > On Sun, Jul 19, 2015 at 2:15 PM, Steev Klimaszewski < > threeway-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > > The nyan-big Chromebook uses a 1920x1080 panel, not a 1366x768 > > panel so correct > > the binding. > > This isn't incorrect, although it is not complete. Nyan-big (Acer > CB5-311) has _both_ a 1920x1080 and 1366x768 variant available. They > are referred to as the "Full HD" and "HD" models respectively. Actually, as it turns out, that was a wrong turn. The real issue is that 1d002fa720738bcd0bddb9178e9ea0773288e1dd (drm/dp: Use large transactions for I2C over AUX) breaks reading of EDID data on the nyan_big "Full HD" - I'm not sure if it does on others, but by setting DP_AUX_MAX_PAYLOAD_BYTES to 1, it fixed reading the EDID data here and I have 1920x1080 at boot, with valid EDID data. Not really sure the best way to go about doing that though. I've poked at some people in #dri-devel on irc, to see what they think.