From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Ripard Subject: Re: [PATCH v3 3/13] mmc: sunxi: Always set signal delay to 0 for A64 Date: Wed, 25 Jan 2017 10:10:34 +0100 Message-ID: <20170125091034.2cwnq7g72fndhuqz@lukather> References: <67fd7dad745b49bb8edb7391655eaddf6f35160e.1484585798.git-series.maxime.ripard@free-electrons.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="uwly4umxqaau2v7z" Return-path: Content-Disposition: inline In-Reply-To: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Ulf Hansson Cc: Chen-Yu Tsai , Rob Herring , "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Andre Przywara List-Id: devicetree@vger.kernel.org --uwly4umxqaau2v7z Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi Ulf, On Tue, Jan 24, 2017 at 09:16:12AM +0100, Ulf Hansson wrote: > On 16 January 2017 at 17:56, Maxime Ripard > wrote: > > Experience have shown that the using the autocalibration could severely > > degrade the performances of the MMC bus. > > > > Allwinner is using in its BSP a delay set to 0 for all the modes but HS= 400. > > Remove the calibration code for now, and add comments to document our > > findings. >=20 > So doesn't this break some platforms using HS400? Or are you saying > those are already broken? Like Andre said, HS400 isn't supported at all, so there's no regression or brokenness involved :) Maxime --=20 Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com --uwly4umxqaau2v7z Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIcBAEBCAAGBQJYiGuGAAoJEBx+YmzsjxAgTSUP/3L0a4eEBq+bdw1/18luKR57 9JXbObOx0ofgsmfSacxBQQxKGACsnvaRZ8ZyKUN7jDCTKJ6ZLnuKLUXF344XiHa+ DvZt1d9nA9qjdXdas/0u3x2m5LXJeL+Jp6D1NGaNqcIqnNYHdKuqRC5l7VmjPqJa JIeUO9Nsi+i/2lwEFQ9Fsay8Imy3rUCYNduEhKe5Ix9uqtAfm1/p9CX/nKS69IHo OlRMIV1lF+qyyI4enPC46nI2IGA1GI8hQu0aTXfOf+5Uq5sEH0ZrUVp00D7Rb6Q9 xJK98Rh9BKv7tkeN7Cv7FUbjj43Zk75J0VCJP/kb5P/H6w+ytFjkfhj7M6EGk9xW zrfnDr+YkLKoKWh6Vl7L/jwSlkxp8HBYe3HEE0URNtmBuWMxiGGyBjNHkq83aXNQ IpvuXANamb1yPAiavq5ssKmAR3FZz9EaRjK0dMdDanVe1TXaCzdEBSMl148CKrZp ODoYocxvRkd3y7klK0qfb3ekHCXJ/KAqKk7ihS91CzV3s7z4hkXUvWWwiUnGkzYl VPeEL/8NUeQBXNCwblVpqKI2SjMfgKdI2ZEvNwdW5IEvjhmm1pCPMQxec5GQ6Iym oNTr5m+1Ul+bu9XeG6c5AQ+G9ZJK1sWTu4EDJEKm6l17ixF9XLZlkscJyiRhj05o BHhUg5AA/lUQs1VpKhwH =qsRX -----END PGP SIGNATURE----- --uwly4umxqaau2v7z-- -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html