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=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_MUTT 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 BE728C07542 for ; Sat, 25 May 2019 19:58:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8405E20862 for ; Sat, 25 May 2019 19:58:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727392AbfEYT6z (ORCPT ); Sat, 25 May 2019 15:58:55 -0400 Received: from sauhun.de ([88.99.104.3]:46558 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725791AbfEYT6z (ORCPT ); Sat, 25 May 2019 15:58:55 -0400 Received: from localhost (p5486CB33.dip0.t-ipconnect.de [84.134.203.51]) by pokefinder.org (Postfix) with ESMTPSA id 2E7D22C016F; Sat, 25 May 2019 21:58:53 +0200 (CEST) Date: Sat, 25 May 2019 21:58:52 +0200 From: Wolfram Sang To: Ajay Gupta Cc: heikki.krogerus@linux.intel.com, linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, Ajay Gupta Subject: Re: [PATCH v3 4/5] i2c: nvidia-gpu: resume ccgx i2c client Message-ID: <20190525195852.GC12538@kunai> References: <20190522183142.11061-1-ajayg@nvidia.com> <20190522183142.11061-5-ajayg@nvidia.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="xesSdrSSBC0PokLI" Content-Disposition: inline In-Reply-To: <20190522183142.11061-5-ajayg@nvidia.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org --xesSdrSSBC0PokLI Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, May 22, 2019 at 11:31:41AM -0700, Ajay Gupta wrote: > From: Ajay Gupta >=20 > Cypress USB Type-C CCGx controller firmware version 3.1.10 > (which is being used in many NVIDIA GPU cards) has known issue of > not triggering interrupt when a USB device is hot plugged to runtime > resume the controller. If any GPU card gets latest kernel with runtime > pm support but does not get latest fixed firmware then also it should > continue to work and therefore a workaround is required to check for > any connector change event >=20 > The workaround is to request runtime resume of i2c client > which is UCSI Cypress CCGx driver. CCG driver will call the ISR > for any connector change event only if NVIDIA GPU has old > CCG firmware with the known issue. >=20 > Signed-off-by: Ajay Gupta Can't say if this is a valid workaround but here is my ack for modifying the I2C realm: Acked-by: Wolfram Sang --xesSdrSSBC0PokLI Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAlzpnnwACgkQFA3kzBSg Kbb4xBAAr0Jk4qrB9mRCfyYB50te6dejjLWIrKpP/ZnQax2vXjNy0EvbdPGbcykN a3btkeFJz96xUAEEWilTBznj2V6mgPO78h69s6+ZVgMY0ggC/43pY8cGZ5CAQqu6 M7sL5nox2ga/auhCshL5QZZNd0cHijtzYoMnRA+iJKr5PkqPVNMxIGhLUPBmLPJ1 56Z3snzgfsOrRkOAjeKj8+/oPH1D+Tbu1kVmOHl5UGiQbzI3LN16bWepZZa4kMJ8 DGcAYFc2Nqm2XC8UeoekW0pqzT4HYGlwSbXRmZpSvEgE0ToA6p5hyZK2K8ZBzmkP vEzX6Ma8JqzZzUJgeckxCr0osfdAUnLQaA/swZyKVrNBcU8my6ABFy64a+F591hZ Ya+re6jfVWU68+fLBxBVXnQ4/GCUb6KoXv0b07UZCkTid/Nl/DMtdGX4YEpDu8ho ZBNp6C7w7kb8UFxIDhbNvKxHVkCfVD9iMfkDet9lOlsAkVtYacDKcfSaAqDLKOWp U8/hX+qfgxCq8uniwifC8/3tYpVi/uiFkqsj/MMdHq8B9VhtKZw+djybk4GF4AeB XZ6JFWiqf3MkJ2GhkQ7w0lrBRxGtIi7WrtP5gcQ6aCYQ2eTSi4XTlCX3HY4D+WdH ArGJHBZbEVwZgbLZJkRMwKd9wZrKwHbztLGUfQNmzhYbpdbaBIY= =LmJF -----END PGP SIGNATURE----- --xesSdrSSBC0PokLI--