From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Thu, 9 Mar 2017 15:55:39 +0100 Subject: [linux-sunxi] Re: [PATCH 10/15] drm/sun4i: tcon: Switch mux on only for composite In-Reply-To: References: <3f70bcfe2ec03188c06d54a262d49ad91963a510.1488876832.git-series.maxime.ripard@free-electrons.com> <20170309105800.mnzhvnky6na7d5vn@lukather> Message-ID: <20170309145539.43eequth2ej7wvqk@lukather> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Mar 09, 2017 at 07:31:27PM +0800, Chen-Yu Tsai wrote: > >> Additionally, the mux registers are only valid in the first TCON, meaning > >> it must available be active in 2 pipeline chips. It's also why we'd pass > >> "struct drm_device *" instead of "struct sun4i_tcon *". > > > > Hmmmm. That's going to be tricky to support. Has this been confirmed > > somehow? Is the register used for something else on TCON1? > > At this point, the only reference is Allwinner's kernel, and the old 3.4 > kernel for A10/A20. I could try getting HDMI working on the A31 to get > some real results. > > FWIW, the registers do not seem to be aliased across the two TCONs. Then maybe we don't need to care, and we can just always write to the mux? Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: not available URL: