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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,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 1C5D7C31E57 for ; Mon, 17 Jun 2019 12:57:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E4F45205ED for ; Mon, 17 Jun 2019 12:57:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726708AbfFQM5m (ORCPT ); Mon, 17 Jun 2019 08:57:42 -0400 Received: from metis.ext.pengutronix.de ([85.220.165.71]:48687 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726121AbfFQM5l (ORCPT ); Mon, 17 Jun 2019 08:57:41 -0400 Received: from gallifrey.ext.pengutronix.de ([2001:67c:670:201:5054:ff:fe8d:eefb] helo=bjornoya.blackshift.org) by metis.ext.pengutronix.de with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1hcrCc-0000Ah-KB; Mon, 17 Jun 2019 14:57:38 +0200 Received: from [IPv6:2a03:f580:87bc:d400:10a:6ce2:4275:4351] (unknown [IPv6:2a03:f580:87bc:d400:10a:6ce2:4275:4351]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mkl@blackshift.org", Issuer "StartCom Class 1 Client CA" (not verified)) (Authenticated sender: mkl@blackshift.org) by smtp.blackshift.org (Postfix) with ESMTPSA id 51D15420E4C; Mon, 17 Jun 2019 12:57:37 +0000 (UTC) Subject: Re: [PATCH] can: flexcan: fix stop mode acknowledgment To: Joakim Zhang , "linux-can@vger.kernel.org" Cc: dl-linux-imx , "wg@grandegger.com" , "netdev@vger.kernel.org" References: <20190611064458.1477-1-qiangqing.zhang@nxp.com> From: Marc Kleine-Budde Openpgp: preference=signencrypt Autocrypt: addr=mkl@pengutronix.de; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.1 MIME-Version: 1.0 In-Reply-To: <20190611064458.1477-1-qiangqing.zhang@nxp.com> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="cvAjkbgjtIBPFXtwAZGsZw2EolaY2hBIx" X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: netdev@vger.kernel.org Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --cvAjkbgjtIBPFXtwAZGsZw2EolaY2hBIx Content-Type: multipart/mixed; boundary="UiByezooILPcSPJ4wew7Ay0aqL1JqGCw1"; protected-headers="v1" From: Marc Kleine-Budde To: Joakim Zhang , "linux-can@vger.kernel.org" Cc: dl-linux-imx , "wg@grandegger.com" , "netdev@vger.kernel.org" Message-ID: Subject: Re: [PATCH] can: flexcan: fix stop mode acknowledgment References: <20190611064458.1477-1-qiangqing.zhang@nxp.com> In-Reply-To: <20190611064458.1477-1-qiangqing.zhang@nxp.com> --UiByezooILPcSPJ4wew7Ay0aqL1JqGCw1 Content-Type: text/plain; charset=utf-8 Content-Language: de-DE Content-Transfer-Encoding: quoted-printable On 6/11/19 8:47 AM, Joakim Zhang wrote: > To enter stop mode, the CPU should manually assert a global Stop Mode > request and check the acknowledgment asserted by FlexCAN. The CPU must > only consider the FlexCAN in stop mode when both request and > acknowledgment conditions are satisfied. >=20 > Fixes: de3578c198c6 ("can: flexcan: add self wakeup support") > Reported-by: Marc Kleine-Budde > Signed-off-by: Joakim Zhang > --- > drivers/net/can/flexcan.c | 47 ++++++++++++++++++++++++++++++++-------= > 1 file changed, 39 insertions(+), 8 deletions(-) >=20 > diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c > index e35083ff31ee..282dac1d8f5c 100644 > --- a/drivers/net/can/flexcan.c > +++ b/drivers/net/can/flexcan.c > @@ -404,9 +404,11 @@ static void flexcan_enable_wakeup_irq(struct flexc= an_priv *priv, bool enable) > priv->write(reg_mcr, ®s->mcr); > } > =20 > -static inline void flexcan_enter_stop_mode(struct flexcan_priv *priv) > +static inline int flexcan_enter_stop_mode(struct flexcan_priv *priv) > { > struct flexcan_regs __iomem *regs =3D priv->regs; > + unsigned int timeout =3D FLEXCAN_TIMEOUT_US / 10; > + unsigned int ackval; > u32 reg_mcr; > =20 > reg_mcr =3D priv->read(®s->mcr); > @@ -416,20 +418,48 @@ static inline void flexcan_enter_stop_mode(struct= flexcan_priv *priv) > /* enable stop request */ > regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr, > 1 << priv->stm.req_bit, 1 << priv->stm.req_bit); > + > + /* get stop acknowledgment */ > + regmap_read(priv->stm.gpr, priv->stm.ack_gpr, &ackval); Please make use of regmap_read_poll_timeout(). Marc --=20 Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de | --UiByezooILPcSPJ4wew7Ay0aqL1JqGCw1-- --cvAjkbgjtIBPFXtwAZGsZw2EolaY2hBIx Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEmvEkXzgOfc881GuFWsYho5HknSAFAl0HjjsACgkQWsYho5Hk nSAc6Af/SC6IZIEi3x800dtNiFzZK5yxPBNrJYiloomQ0SXnnLugf2+aF3A4xteR iNYGimTyvKfKYuccbADp9PVhfmvAwoPPssMLMWoThB3yaOyW6EDQz0sx9nvngEQY u0eWIkmSzFj3fAVeVXpWXUh+40GudQk0gDCPpB05DCOhlS0CRbl91wcUAchSd9rX zOtt0z08lDcsTgDkqWoP8FULcv56/L9S8gmsg438W0zdHXp71vS3UG3ePl8bvKpD IQ8I1U/dvZYgFJuaP9/hjiNMDPi64aTfn/h9mUnH6AYIjzgcBuSlVhpny9It0WjJ gVwAx97DVegOWC51NQxmpEL5vRfg/A== =5lfw -----END PGP SIGNATURE----- --cvAjkbgjtIBPFXtwAZGsZw2EolaY2hBIx--