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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 4015EC49ED6 for ; Wed, 11 Sep 2019 20:48:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1219B2085B for ; Wed, 11 Sep 2019 20:48:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729413AbfIKUsr (ORCPT ); Wed, 11 Sep 2019 16:48:47 -0400 Received: from anholt.net ([50.246.234.109]:39966 "EHLO anholt.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729327AbfIKUsr (ORCPT ); Wed, 11 Sep 2019 16:48:47 -0400 Received: from localhost (localhost [127.0.0.1]) by anholt.net (Postfix) with ESMTP id B20CF10A37A2; Wed, 11 Sep 2019 13:48:46 -0700 (PDT) X-Virus-Scanned: Debian amavisd-new at anholt.net Received: from anholt.net ([127.0.0.1]) by localhost (kingsolver.anholt.net [127.0.0.1]) (amavisd-new, port 10024) with LMTP id QFhPKD3VB0id; Wed, 11 Sep 2019 13:48:45 -0700 (PDT) Received: from eliezer.anholt.net (localhost [127.0.0.1]) by anholt.net (Postfix) with ESMTP id 70C5D10A379E; Wed, 11 Sep 2019 13:48:45 -0700 (PDT) Received: by eliezer.anholt.net (Postfix, from userid 1000) id A112E2FE2E27; Wed, 11 Sep 2019 13:48:46 -0700 (PDT) From: Eric Anholt To: Stefan Wahren , Florian Fainelli , Ray Jui , Scott Branden , Paul Kocialkowski , boris.brezillon@bootlin.com Cc: bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, Stefan Wahren , stable@vger.kernel.org Subject: Re: [PATCH] Revert "ARM: bcm283x: Switch V3D over to using the PM driver instead of firmware." In-Reply-To: <1567957493-4567-1-git-send-email-wahrenst@gmx.net> References: <1567957493-4567-1-git-send-email-wahrenst@gmx.net> User-Agent: Notmuch/0.22.2+1~gb0bcfaa (http://notmuchmail.org) Emacs/26.1 (x86_64-pc-linux-gnu) Date: Wed, 11 Sep 2019 13:48:46 -0700 Message-ID: <87ftl2lftd.fsf@anholt.net> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org --=-=-= Content-Type: text/plain Stefan Wahren writes: > Since release of the new BCM2835 PM driver there has been several reports > of V3D probing issues. This is caused by timeouts during powering-up the > GRAFX PM domain: > > bcm2835-power: Timeout waiting for grafx power OK > > I was able to reproduce this reliable on my Raspberry Pi 3B+ after setting > force_turbo=1 in the firmware configuration. Since there are no issues > using the firmware PM driver with the same setup, there must be an issue > in the BCM2835 PM driver. > > Unfortunately there hasn't been much progress in identifying the root cause > since June (mostly in the lack of documentation), so i decided to switch > back until the issue in the BCM2835 PM driver is fixed. > > Link: https://github.com/raspberrypi/linux/issues/3046 > Fixes: e1dc2b2e1bef (" ARM: bcm283x: Switch V3D over to using the PM driver instead of firmware.") > Cc: stable@vger.kernel.org > Signed-off-by: Stefan Wahren Acked-by: Eric Anholt I wish someone with firmware source had the time to look into why using open source drivers to drive this hardware was failing, but I don't have that time or code any more. --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE/JuuFDWp9/ZkuCBXtdYpNtH8nugFAl15Xa4ACgkQtdYpNtH8 nui29hAAghQUxmPKCpEEJiONuOiuIC7ozMT9p5wZ2f3fdWyJdDFBBLGldPea7SgA mjNWZ2dk4yUEY2BFKVjoeMCCs3KMdiuqzi+6kkAaK21zflRA1A65Vw65/tfyvzdw iKL24+/dAH9A0k+UcZZ5ujptijaOCdnxif1lc4+hyADe1Oxw5E8Be8d9GvadZwaU mOG+16Sf0U3OcbGOvfPndIrHeKHgDpVN+U0MNUlEx1HMh7yfXT0QtK7iSwabjWZF FJ27WGqPaEo3+LMGCOSj5TEA72B08oEvl0nbl562dFWT6mau3R9DiCEZcWNODMhZ YAZ+fxJR3MeHsr8KdxH1p6Z9eDNCxaa9LOz6+Tmn5SEUlaMdiNFi84FjMgct9JoK 3O1h8tzijpjvifSvwa1r4jVNMi3y+8vIZ+RTyGCTB9yoye0Hs+zJgtSu3vbjs6Nz Scd3TjCslZBPlm7TpSAFCyIowuMOGmWASq0eoOxRBMGTQYPLorqR+llenYOCbtEC l9Vx3WdoPgH2Zd+Hof9Jn7ZDwDrtyFXkOsFwSmoRkVzPTH9u108rTX8+AkyxDybt CvhnFGxUg2cOTTTIUoDYFpxQN7bTzjIqq7iu5iVQlXzq9js5/TovcdA6jO9u5B4N 2fVQGEGrfJeWZM0ICoVDaILnEHdASZYD/s3nbIq4/Jkrmu40MMc= =vNM5 -----END PGP SIGNATURE----- --=-=-=--