From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Anholt Subject: Re: [PATCH 1/2] mmc: sdhci-iproc: Apply caps from bcm2835-mmc driver Date: Wed, 04 Jan 2017 10:16:06 -0800 Message-ID: <871swi8zdl.fsf@eliezer.anholt.net> References: <1483111474-29907-1-git-send-email-stefan.wahren@i2se.com> <1483111474-29907-2-git-send-email-stefan.wahren@i2se.com> <87lgusngn7.fsf@eliezer.anholt.net> <1751352115.251342.1483474996021@email.1und1.de> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" Return-path: Received: from anholt.net ([50.246.234.109]:48420 "EHLO anholt.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757840AbdADSXi (ORCPT ); Wed, 4 Jan 2017 13:23:38 -0500 In-Reply-To: <1751352115.251342.1483474996021@email.1und1.de> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Stefan Wahren , Gerd Hoffmann , Adrian Hunter , Ulf Hansson Cc: Ray Jui , Scott Branden , linux-mmc@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, Jon Mason --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Stefan Wahren writes: > Hi Eric, > >> Eric Anholt hat am 3. Januar 2017 um 19:27 geschrieben: >>=20 >>=20 >> Stefan Wahren writes: >>=20 >> > Since the mmc module on bcm2835 neither provide a capabilities registe= r nor=20 >> > free documentation we must rely on the downstream implementation [1]. >>=20 >> Yeah, caps reg is wired to 0, but it can do high speed. >>=20 >> Since we're VDD_330 only, I'm not sure the driver type flags do >> anything, but I'm still good with having consistency. > > yes, the driver type flags currently have no benefit. > >>=20 >> Reviewed-by: Eric Anholt >>=20 >> Interested in porting over the DMA support? :) > > AFAIK the sdhci doesn't support external DMA (required for bcm2835). > So DMA support would result in a new driver, which i'm currently not inte= rested. > > But i've prepared a fixup patch series for the sdhost driver i want to se= nd to Gerd. > >>=20 >> I also noticed that the emmc wrapper module claims it can run with a >> clock from 50-100mhz, and the arasan says it can run at up to 50, 52, or >> 208mhz depending on SD/MMC mode. Could we get a boost from running the >> module at a higher clock rate? > > Sorry, i can't follow. Do you mean DDR mode? Apparently I what I was reading about was SDR104 mode, which also requires 1.8V. --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE/JuuFDWp9/ZkuCBXtdYpNtH8nugFAlhtO+YACgkQtdYpNtH8 nui/jxAAsDJ8FUnizuI4gNzeB8J4cJIS+IylkdVBLl9htXqNxoxWIToieUC5Q42C xaECcCQFJaPtG9YxDrTsG8etVPnAVOuRySkePRm3QftCeNUf6Yzhf7r3ZUGeIGEj +19jS21nxP8Vndlu3kI+5K/oJF+Yve4/YxXGdln1DFQwm2kmuUK0NJwY56vWGbOM uHl5NVJoWApvUx6omTui40nqmtcy/mnvfJPKSiqvzkHgT3z98v9gU6bOrtS/9i4g i8VSXvQg7wyoxYx5ofHblsj4QU+L6m4B+3FRCKhQK2f7zzeG3ej4ktnVOJzRMAS0 lXPVHk7Bp6uFdpFT47KzIt5awENoQ3tYps6UNBzVzObmi/C/TEKJScmm1/29O1ve BEh3/EuRM3Xdzidj/ZHJaXIslle19ahQyNxM3CLaj1EuouBhOSDDhKZbAGb/N3NP 8j5J5qcHk+r+PMaKu/FeYhJZtUtVEPKECOWiqN/GInTIA36XMAXNYHkpQcijz3dO 9NiV0+t+6ECQeBUzsVkTQ2zOYm713klPEBPDhTGXsybXFN+w3T9pFL/cWo7Ispvw NpMaT3Lff7HUsOplKmnMIA+puP97u4KF/sTu4LoVKcFsdVHSWnLgq+/8RQZXrWNl 0bnmQuFSDy7zFQZTs/QMZF/1WgK9owy3H178qY6Un2P7IZS8l4A= =zE9V -----END PGP SIGNATURE----- --=-=-=--