From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9F500C2BB55 for ; Thu, 16 Apr 2020 11:07:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6BED4206B9 for ; Thu, 16 Apr 2020 11:07:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2505958AbgDPLGu (ORCPT ); Thu, 16 Apr 2020 07:06:50 -0400 Received: from mx2.suse.de ([195.135.220.15]:42564 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2506004AbgDPLDV (ORCPT ); Thu, 16 Apr 2020 07:03:21 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 83812AC52; Thu, 16 Apr 2020 11:03:00 +0000 (UTC) Message-ID: <69b79028764dcdfc9f550a5f95752afb491005f0.camel@suse.de> Subject: Re: [PATCH 0/4] of: property: fw_devlink misc fixes From: Nicolas Saenz Julienne To: Saravana Kannan Cc: Greg Kroah-Hartman , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , Frank Rowand , Rob Herring , LKML Date: Thu, 16 Apr 2020 13:02:59 +0200 In-Reply-To: References: <20200415150550.28156-1-nsaenzjulienne@suse.de> Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-U0A1alyAP1S30q95YmNu" User-Agent: Evolution 3.34.2 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-U0A1alyAP1S30q95YmNu Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2020-04-15 at 11:17 -0700, Saravana Kannan wrote: > On Wed, Apr 15, 2020 at 8:06 AM Nicolas Saenz Julienne > wrote: > > As I'm interested in using this feature to fine-tune Raspberry Pi 4's >=20 > You've made my day! Finally another user outside of Android. :) If > this does improve the boot time, I'd be super interested to see the > numbers. Actually making the boot time faster isn't my main objective just a nice possible side-effect. I'll give you some numbers nonetheless :). I have two things in mind: - Exploring if fw_devlink=3Don can help us solve a rather convoluted devic= e initialization depency we're seeing in RPi4. It could potentially preven= t us from adding nasty platform specific driver code. - See if we can use all this information to fine-tune initrd generation on smaller arm devices with limited i/o speeds. Do you have any plans in moving the default behavior to fw_devlink=3Don? If= so what is blocking us? Also do you think it'd be reasonable to add a DT binding to set the desired fw_devlink level? Something like a 'linux,fw_devlink' property under the /chosen node. > > device probe dependencies, I tried to get the board to boot with > > fw_devlink=3Don. As of today's linux-next the board won't boot with tha= t > > option. I tried to address the underlying issues. >=20 > I'll review the patches. Apologies in advance if my explanations > aren't thorough. A bit swamped right now. They were pretty clear! Thanks, Nicolas --=-U0A1alyAP1S30q95YmNu Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEErOkkGDHCg2EbPcGjlfZmHno8x/4FAl6YO2MACgkQlfZmHno8 x/666wf/VylFMUp6RLlJhIXSGCFQ/cPOJJTYI73tBsxzqgAsq9hWHbuH6fYDBxCU 5AnrhT8W1qkUUEMk4bBN4jUSK0mQJYI1T9pRpHUe6o83pxSeWPEK/kkQMRfLr0UI LxDzhO290djKF7rw9ndeTfV6iEXjNfMuqBzHJkE+22VIkEWQuNiMduE7p5Drfv5a a5CXIkMmUoNJsVRS104xH+lxdg+IFFDrHN9tEhLAua6OMwfClptUKWryeiGqFi6S TV8BvdStbPRPjfQpLnESs/SYp/l5LQVSl/L60q9Rsq7mxXLvmR6UDMRmzbabH4mV ZtR6LwbQkqD8dzPnvpY4i/pmr8xgHg== =SdVL -----END PGP SIGNATURE----- --=-U0A1alyAP1S30q95YmNu--