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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 8E267C3A5A6 for ; Thu, 19 Sep 2019 09:05:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 64CA121927 for ; Thu, 19 Sep 2019 09:05:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731171AbfISJFm (ORCPT ); Thu, 19 Sep 2019 05:05:42 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:38935 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730839AbfISJFl (ORCPT ); Thu, 19 Sep 2019 05:05:41 -0400 Received: by atrey.karlin.mff.cuni.cz (Postfix, from userid 512) id 64BED812CD; Thu, 19 Sep 2019 11:05:26 +0200 (CEST) Date: Thu, 19 Sep 2019 11:05:39 +0200 From: Pavel Machek To: Tony Lindgren Cc: Sebastian Reichel , linux-pm@vger.kernel.org, linux-omap@vger.kernel.org, Merlijn Wajer Subject: Re: [PATCH 1/3] power: supply: cpcap-charger: Limit voltage to 4.2V for battery Message-ID: <20190919090539.GA9644@amd> References: <20190917213501.16907-1-tony@atomide.com> <20190917213501.16907-2-tony@atomide.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="qDbXVdCdHGoSgWSk" Content-Disposition: inline In-Reply-To: <20190917213501.16907-2-tony@atomide.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org --qDbXVdCdHGoSgWSk Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue 2019-09-17 14:34:59, Tony Lindgren wrote: > From: Pavel Machek >=20 > There have been some cases of droid4 battery bulging that seem to > be related to being left connected to the charger for several weeks. >=20 > It is suspected that the 4.35V charge voltage configured for the battery > is too much in the long run, so lets limit the charge voltage to 4.2V. 4.35V is known to make lifetime of battery shorter, but it provides 10% more capacity. Disadvantage of this approach is that if droid is rebooted between mainline and android, battery will go 4.35V->4.2V->4.35V... while on charger. I guess this patch still makes sense, I just wanted to make sure disadvantages are mentioned. Best regards, Pavel > @@ -457,7 +457,7 @@ static void cpcap_usb_detect(struct work_struct *work) > max_current =3D CPCAP_REG_CRM_ICHRG_0A532; > =20 > error =3D cpcap_charger_set_state(ddata, > - CPCAP_REG_CRM_VCHRG_4V35, > + CPCAP_REG_CRM_VCHRG_4V20, > max_current, 0); > if (error) > goto out_err; --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --qDbXVdCdHGoSgWSk Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAl2DROMACgkQMOfwapXb+vLdGwCeLi8jUurAcxB4ZsufCG6/ZVWM YXwAnj7KufmESQZDqN+D8N71Ktb04lR0 =cFLG -----END PGP SIGNATURE----- --qDbXVdCdHGoSgWSk--