From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx01.omp.ru (mx01.omp.ru [90.154.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0FAB430CE1; Sat, 16 Dec 2023 17:28:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=omp.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=omp.ru Received: from [192.168.1.104] (31.173.82.73) by msexch01.omp.ru (10.188.4.12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.1258.12; Sat, 16 Dec 2023 20:28:20 +0300 Subject: Re: [PATCH net-next v2 13/21] net: ravb: Set config mode in ndo_open and reset mode in ndo_close To: Claudiu , , , , , , , , , CC: , , , Claudiu Beznea References: <20231214114600.2451162-1-claudiu.beznea.uj@bp.renesas.com> <20231214114600.2451162-14-claudiu.beznea.uj@bp.renesas.com> From: Sergey Shtylyov Organization: Open Mobile Platform Message-ID: <78688143-e777-c98b-01eb-813f0fe67491@omp.ru> Date: Sat, 16 Dec 2023 20:28:20 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <20231214114600.2451162-14-claudiu.beznea.uj@bp.renesas.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: msexch01.omp.ru (10.188.4.12) To msexch01.omp.ru (10.188.4.12) X-KSE-ServerInfo: msexch01.omp.ru, 9 X-KSE-AntiSpam-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 6.1.0, Database issued on: 12/16/2023 17:04:00 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 59 X-KSE-AntiSpam-Info: Lua profiles 182146 [Dec 15 2023] X-KSE-AntiSpam-Info: Version: 6.1.0.3 X-KSE-AntiSpam-Info: Envelope from: s.shtylyov@omp.ru X-KSE-AntiSpam-Info: LuaCore: 7 0.3.7 6d6bf5bd8eea7373134f756a2fd73e9456bb7d1a X-KSE-AntiSpam-Info: {rep_avail} X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: {relay has no DNS name} X-KSE-AntiSpam-Info: {SMTP from is not routable} X-KSE-AntiSpam-Info: {Found in DNSBL: 31.173.82.73 in (user) b.barracudacentral.org} X-KSE-AntiSpam-Info: 127.0.0.199:7.1.2;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;omp.ru:7.1.1;31.173.82.73:7.1.2 X-KSE-AntiSpam-Info: ApMailHostAddress: 31.173.82.73 X-KSE-AntiSpam-Info: {DNS response errors} X-KSE-AntiSpam-Info: Rate: 59 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-AntiSpam-Info: Auth:dmarc=temperror header.from=omp.ru;spf=temperror smtp.mailfrom=omp.ru;dkim=none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Heuristic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 12/16/2023 17:08:00 X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 12/16/2023 2:57:00 PM X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit On 12/14/23 2:45 PM, Claudiu wrote: > From: Claudiu Beznea > > As some IP variants switch to reset mode (and thus registers' content is Register. > lost) when setting clocks (due to module standby functionality) to be able > to implement runtime PM and save more power, set the IP's operation mode to Operating. > reset at the end of the probe. Along with it, in the ndo_open API the IP > will be switched to configuration, then operational mode. In the ndo_close > API, the IP will be switched back to reset mode. This allows implementing > runtime PM and, along with it, save more power when the IP is not used. > > Signed-off-by: Claudiu Beznea [..] > diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c > index db9222fc57c2..31a1f8a83652 100644 > --- a/drivers/net/ethernet/renesas/ravb_main.c > +++ b/drivers/net/ethernet/renesas/ravb_main.c [...] > @@ -1821,13 +1845,19 @@ static int ravb_open(struct net_device *ndev) > if (info->nc_queues) > napi_enable(&priv->napi[RAVB_NC]); > > + /* Set AVB config mode */ > + error = ravb_set_config_mode(ndev); > + if (error) > + goto out_napi_off; > + I suspect this too belongs in ravb_dmac_init() now... [...] > @@ -2875,19 +2886,30 @@ static int ravb_probe(struct platform_device *pdev) > > device_set_wakeup_capable(&pdev->dev, 1); > > + /* Reset MAC as the module will be runtime disabled at this moment. > + * This saves power. MAC will be switched back to configuration mode > + * in ravb_open(). > + */ > + error = ravb_set_reset_mode(ndev); > + if (error) > + goto out_netdev_unregister; > + I think this now races with the register_netdev() call above (the device can be opened before it returns)! Should be called before register_netdev()... [...] MBR, Sergey