From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Ripard Subject: Re: [linux-sunxi] Re: [PATCH 10/15] drm/sun4i: tcon: Switch mux on only for composite Date: Thu, 9 Mar 2017 15:55:39 +0100 Message-ID: <20170309145539.43eequth2ej7wvqk@lukather> References: <3f70bcfe2ec03188c06d54a262d49ad91963a510.1488876832.git-series.maxime.ripard@free-electrons.com> <20170309105800.mnzhvnky6na7d5vn@lukather> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1654771546==" Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Chen-Yu Tsai Cc: Mark Rutland , devicetree , Mike Turquette , Stephen Boyd , linux-kernel , dri-devel , linux-sunxi , Rob Herring , Daniel Vetter , linux-clk , linux-arm-kernel List-Id: devicetree@vger.kernel.org --===============1654771546== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="h753cmu4qni4wyzx" Content-Disposition: inline --h753cmu4qni4wyzx Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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, mean= ing > >> it must available be active in 2 pipeline chips. It's also why we'd pa= ss > >> "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? >=20 > 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. >=20 > 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 --=20 Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com --h753cmu4qni4wyzx Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIcBAEBCAAGBQJYwWznAAoJEBx+YmzsjxAgM/gP/0I1y73K2s/qMlT9DUThALv1 my4pbybYM8Gqp3b27Va5qiPsy/e79qK38/oyRKKBdJow5HaQO2g06wPPhXPXNIrp nK5+olfnpx0ZnO24pWDw6B+mxDyi1HrpspTG/CKx97bqwrxyWd+Tj3U2i7qoEQ/q icdJ14q2KJ5AvFjQkr+HWCnceogvN76gom8oxFMOZ98FVEcTZKEej+cEbLyvIisd zLmOutk1bwlwRU86/NTB0xDJ9Gss1fT7NtaUpBKKcuAqsSdhzH1z7CM2RSLWqLqm Dx6kUhYZUmxTOw7dqXY0YfY/Jab2REy+5pGKBlTOY6FZRHzAE9biRHc0SjKdoKxh Xr8LMSFCO5+RlY41PvzUbnwx1/mRiCNrP8etgezpfME1MxsGW1Zmde6avWvWBNKM 8q9C8W+DPJi1qA43wVjJlfNkDknjaGIxbGB92WjMdDxezYQYWLjZs02OGrULe9pR tV7ZMgrVS04hK16wDCqkwXsp6jL2xhUnFPQvF0aBUIy61AHxIIdVM7z5CwyBfjQc T7lIZCfCQRqIumEhg477eiw3bAEz0BoSr6VTvFjmT2G6Fd89IalX3J5ttyEpem9+ 7zPG+5K7j/InkEMwiOyu94yqK1Oc7wXiIyGsRXEr6ZDhXip8h0I5z9hq3BkS+A2c 2HGZHv5+YtuUsUkAe2ev =AF8I -----END PGP SIGNATURE----- --h753cmu4qni4wyzx-- --===============1654771546== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZHJpLWRldmVs IG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlz dHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVsCg== --===============1654771546==--