From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Ripard Subject: Re: [PATCH v3 5/13] mmc: sunxi: Mask DATA0 when updating the clock Date: Wed, 25 Jan 2017 10:16:13 +0100 Message-ID: <20170125091613.hmlqoeh6hlqh57wh@lukather> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="ml3hgkidtpfvanxm" Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Ulf Hansson Cc: Chen-Yu Tsai , Rob Herring , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mmc@vger.kernel.org" , Andre Przywara List-Id: devicetree@vger.kernel.org --ml3hgkidtpfvanxm Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jan 24, 2017 at 09:18:46AM +0100, Ulf Hansson wrote: > On 16 January 2017 at 17:56, Maxime Ripard > wrote: > > The A64 MMC controllers need DATA0 to be masked while updating the cloc= k, > > otherwise any subsequent command will result in a timeout. >=20 > Could you elaborate on what mask DATA0 really means? I don't follow. To be honest, I don't really know :) This is how it's called both in the vendor tree and the datasheet. I *think* it might be the first data line on the bus, but I'm not sure exactly why that would cause any issue when updating the clock. Maxime --=20 Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com --ml3hgkidtpfvanxm Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIcBAEBCAAGBQJYiGzYAAoJEBx+YmzsjxAgdUcQAIbpWuWV6VAdA7mYR+XY6OIO /3nnh2721twIj2KFwwfqtqVTY4qMslOI4lefqdRcUOrC+BwPiOJqj+cyCWXsbxMA AxuBJdELagdPMnhgVn3rgsd4DHGvMMi1uoe9bo9JOzgRdvFohAvReTDIQOH8GRdH 4e4ncZpSZAmCE49zN636bxVsGtnpPGUYePuq1sN3el05rm/po6qL2XmezskjjuuS V3SATQb4fe+mpZb2+BFKAlEfpliK4HHHs4wjc/eh1jRkfux8X45R2sX14dbjRllu /PtJXRfbGCHsIC0VcoqRaV/ctEVCEJUGKlm3H4LYmu22BMWL7+v3x5Fj1/omAJhy LHjV6J8cLfXDvVSkAuy1puTmZzYkhOplWE+ANTwX0ZU193ONuW29zTOHtMxCIkcN lvkU+VlwyW5nPhurl17PWQ2bX1sLOM8JxVFyUgXCbGrHDDokRiSEt+jUpaDodnkx S9Ar9bHLOTb7Iw1aeYxuX42FObQxN2aZJe2fd5eEHU44TqrOUuMsDVK1kpmteiv1 zLPFgCkwZWx/7/vizACno21kBqKhRRQBK47mxzcI+AnD8befA9vZxNKC69px/rsp Vn5FP8KdVHrV27nkOjkXtOmEMH+DV3EaSjHb8TWs4cZ0P2LmXCZ3tW9r976nPVae woY2Q4E2qX8ApoMt1/Ym =7Khm -----END PGP SIGNATURE----- --ml3hgkidtpfvanxm--