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 D54A773185; Thu, 21 Dec 2023 19:55:01 +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] (178.176.75.203) 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; Thu, 21 Dec 2023 22:54:52 +0300 Subject: Re: [PATCH net-next v2 11/21] net: ravb: Move DBAT configuration to the driver's ndo_open API To: claudiu beznea , , , , , , , , , CC: , , , Claudiu Beznea References: <20231214114600.2451162-1-claudiu.beznea.uj@bp.renesas.com> <20231214114600.2451162-12-claudiu.beznea.uj@bp.renesas.com> <4721c4e6-cc0f-48bd-8b14-4a8217ada1fd@omp.ru> <59ba595a-ab79-cc5d-feff-dad60e80c44f@omp.ru> <3d4511bd-fd96-4281-a5cb-ac1765bded31@tuxon.dev> From: Sergey Shtylyov Organization: Open Mobile Platform Message-ID: <3aa8a9f5-fe7b-1484-ac89-64b4a1d5face@omp.ru> Date: Thu, 21 Dec 2023 22:54:52 +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: <3d4511bd-fd96-4281-a5cb-ac1765bded31@tuxon.dev> 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: 12/21/2023 19:37:26 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 59 X-KSE-AntiSpam-Info: Lua profiles 182285 [Dec 21 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: 178.176.75.203 in (user) b.barracudacentral.org} X-KSE-AntiSpam-Info: {Found in DNSBL: 178.176.75.203 in (user) dbl.spamhaus.org} X-KSE-AntiSpam-Info: d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;omp.ru:7.1.1;127.0.0.199:7.1.2 X-KSE-AntiSpam-Info: ApMailHostAddress: 178.176.75.203 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: 12/21/2023 19:41:00 X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 12/21/2023 5:11:00 PM X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit On 12/20/23 2:41 PM, claudiu beznea wrote: [...] >>>>>> From: Claudiu Beznea >>>>>> >>>>>> DBAT setup was done in the driver's probe API. As some IP variants switch >>>>>> to reset mode (and thus registers' content is lost) when setting clocks >>>>>> (due to module standby functionality) to be able to implement runtime PM >>>>>> move the DBAT configuration in the driver's ndo_open API. >>>>>> >>>>>> This commit prepares the code for the addition of runtime PM. >>>>>> >>>>>> Signed-off-by: Claudiu Beznea >>>>> >>>>> Reviewed-by: Sergey Shtylyov >>>>> >>>>> [...] >>>>>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c >>>>>> index 04eaa1967651..6b8ca08be35e 100644 >>>>>> --- a/drivers/net/ethernet/renesas/ravb_main.c >>>>>> +++ b/drivers/net/ethernet/renesas/ravb_main.c >>>>>> @@ -1822,6 +1822,7 @@ static int ravb_open(struct net_device *ndev) >>>>>> napi_enable(&priv->napi[RAVB_NC]); >>>>>> >>>>>> ravb_set_delay_mode(ndev); >>>>>> + ravb_write(ndev, priv->desc_bat_dma, DBAT); >>>> >>>> Looking at it again, I suspect this belong in ravb_dmac_init()... >>> >>> ravb_dmac_init() is called from multiple places in this driver, e.g., >> >> It's purpose is to configure AVB-DMAC and DBAT is the AVB-DMAC register, >> right? > > It is. But it is pointless to configure it more than one time after > ravb_open() has been called as the register content is not changed until IP > enters reset mode (though ravb_close() now). The same is true for the most registers set by ravb_dmac_init()! [...] MBR, Sergey