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Mon, 5 Jun 2023 09:50:34 +0000 (UTC) Date: Mon, 5 Jun 2023 11:50:33 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: , , , , , , , Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Jerome Brunet , Martin Blumenstingl , Kevin Hilman , Jianxin Pan Subject: Re: [PATCH v1] mtd: rawnand: meson: fix ready/busy command Message-ID: <20230605115033.7a9eb4c9@xps-13> In-Reply-To: <9bea333a-e5fc-af89-29a0-fa01236488a3@sberdevices.ru> References: <20230605061048.485622-1-AVKrasnov@sberdevices.ru> <19f809ab-218e-8da5-6d5e-ac47902fa706@sberdevices.ru> <20230605101739.069b98af@xps-13> <9bea333a-e5fc-af89-29a0-fa01236488a3@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230605_025039_848363_0E0DE533 X-CRM114-Status: GOOD ( 23.21 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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Mon, 5 Jun 2023 09:50:34 +0000 (UTC) Date: Mon, 5 Jun 2023 11:50:33 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: , , , , , , , Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Jerome Brunet , Martin Blumenstingl , Kevin Hilman , Jianxin Pan Subject: Re: [PATCH v1] mtd: rawnand: meson: fix ready/busy command Message-ID: <20230605115033.7a9eb4c9@xps-13> In-Reply-To: <9bea333a-e5fc-af89-29a0-fa01236488a3@sberdevices.ru> References: <20230605061048.485622-1-AVKrasnov@sberdevices.ru> <19f809ab-218e-8da5-6d5e-ac47902fa706@sberdevices.ru> <20230605101739.069b98af@xps-13> <9bea333a-e5fc-af89-29a0-fa01236488a3@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230605_025039_848363_0E0DE533 X-CRM114-Status: GOOD ( 23.21 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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Mon, 5 Jun 2023 09:50:34 +0000 (UTC) Date: Mon, 5 Jun 2023 11:50:33 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: , , , , , , , Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Jerome Brunet , Martin Blumenstingl , Kevin Hilman , Jianxin Pan Subject: Re: [PATCH v1] mtd: rawnand: meson: fix ready/busy command Message-ID: <20230605115033.7a9eb4c9@xps-13> In-Reply-To: <9bea333a-e5fc-af89-29a0-fa01236488a3@sberdevices.ru> References: <20230605061048.485622-1-AVKrasnov@sberdevices.ru> <19f809ab-218e-8da5-6d5e-ac47902fa706@sberdevices.ru> <20230605101739.069b98af@xps-13> <9bea333a-e5fc-af89-29a0-fa01236488a3@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Hi Arseniy, avkrasnov@sberdevices.ru wrote on Mon, 5 Jun 2023 11:27:34 +0300: > On 05.06.2023 11:17, Miquel Raynal wrote: > > Hi Arseniy, > >=20 > > avkrasnov@sberdevices.ru wrote on Mon, 5 Jun 2023 09:39:40 +0300: > > =20 > >> Hello Miquel! > >> > >> I exclude this patch from the recent Meson patchset, as it is fix and = not related to another patches. > >> Also I think that I can split Meson patchset (from links below) in the= following way: > >> 1) Patch/patchset for OOB layout > >> 2) Patchset for "nand-rb" logic (meson_nand.c + DT bindings) > >> These two can also go independently: > >> 3) https://lore.kernel.org/linux-mtd/20230601061850.3907800-6-AVKrasno= v@sberdevices.ru/ > >> 4) https://lore.kernel.org/linux-mtd/20230601061850.3907800-7-AVKrasno= v@sberdevices.ru/ =20 > >=20 > > LGTM. =20 >=20 > I think we don't need this patch with new RB_INT value. I dive into conve= rsations with Liang Yang - author of this driver. He said, > that this define is "special" polling mode. Now I'm a little bit more exp= erienced in NAND area, so IIUC we have two basic waiting modes: > 1) Software, by sending status command, then polling reply from controlle= r, and then finally send READ0 to exit status reading mode (nand_soft_waitr= dy()). This is useful... > 2) By RB pin and interrupt - in this mode we send vendor specific command= to the controller and it triggers interrupt on RB pin update. > In this case RB pin must be connected to the controller. This mode is = already implemented by Liang Yang. ...this is useful... >=20 > Now, command with this new define works in the following way: we send sta= tus command, by instead of reading reply from it by software, > controller itself checks RB pin and status ready bit in IO bus. Driver ju= st waits on completion. After waiting we need to send > READ0 command again to make controller leave status reading mode. I think= this is like "intermediate" mode between software polling > and hardware interrupt - there is no need to spin in loop, waiting for st= atus ready bit, but still need to leave status mode by sending > READ0 command. I'm not sure that we need this as third mode of waiting fo= r command is done. May be at least not in this work on Meson driver, > so I guess to drop this patch at this moment and add 'nand_soft_waitrdy(= )' support. ...I agree we can skip this one. Thanks, Miqu=C3=A8l 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 39789C7EE23 for ; Mon, 5 Jun 2023 09:51:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=QGRxm5vr211EGhhKHLj3GFP5+S9ex4tOYlDfBhGC4rc=; b=F5iAZeCBG21x8o K6oT0zJPmct4Jpm3nuk+cNbxmwe44oVwtVVPEeflxk76f+pMpBAY45WxId9p3ZGQm4Y4ggr7fyBaQ +jv01wMrMama3/CTBTvBD2tJzy2XvShyPneXTScA5YqElCRKOBLkuQOzWsJRdR+vTPx2LixkB0NBx X3fw0CYXAp9b9HPjPjvk5jIj6ETWbn/zQqCESHtLO8cOAp+J3es5t6P7SIx82TKJaiXGA2iP1FK8Y u/RBJI2+dsh+9FqUOQPbKuzqXGCMioL/mSa6+duWlvIkl9oWPfUfsF6otxwhH8ULTkN46kWJTWKeX 0SJC86ZvxsgXzlmXbCqw==; 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Mon, 5 Jun 2023 09:50:34 +0000 (UTC) Date: Mon, 5 Jun 2023 11:50:33 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: , , , , , , , Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Jerome Brunet , Martin Blumenstingl , Kevin Hilman , Jianxin Pan Subject: Re: [PATCH v1] mtd: rawnand: meson: fix ready/busy command Message-ID: <20230605115033.7a9eb4c9@xps-13> In-Reply-To: <9bea333a-e5fc-af89-29a0-fa01236488a3@sberdevices.ru> References: <20230605061048.485622-1-AVKrasnov@sberdevices.ru> <19f809ab-218e-8da5-6d5e-ac47902fa706@sberdevices.ru> <20230605101739.069b98af@xps-13> <9bea333a-e5fc-af89-29a0-fa01236488a3@sberdevices.ru> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230605_025039_848363_0E0DE533 X-CRM114-Status: GOOD ( 23.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org SGkgQXJzZW5peSwKCmF2a3Jhc25vdkBzYmVyZGV2aWNlcy5ydSB3cm90ZSBvbiBNb24sIDUgSnVu IDIwMjMgMTE6Mjc6MzQgKzAzMDA6Cgo+IE9uIDA1LjA2LjIwMjMgMTE6MTcsIE1pcXVlbCBSYXlu YWwgd3JvdGU6Cj4gPiBIaSBBcnNlbml5LAo+ID4gCj4gPiBhdmtyYXNub3ZAc2JlcmRldmljZXMu cnUgd3JvdGUgb24gTW9uLCA1IEp1biAyMDIzIDA5OjM5OjQwICswMzAwOgo+ID4gICAKPiA+PiBI ZWxsbyBNaXF1ZWwhCj4gPj4KPiA+PiBJIGV4Y2x1ZGUgdGhpcyBwYXRjaCBmcm9tIHRoZSByZWNl bnQgTWVzb24gcGF0Y2hzZXQsIGFzIGl0IGlzIGZpeCBhbmQgbm90IHJlbGF0ZWQgdG8gYW5vdGhl ciBwYXRjaGVzLgo+ID4+IEFsc28gSSB0aGluayB0aGF0IEkgY2FuIHNwbGl0IE1lc29uIHBhdGNo c2V0IChmcm9tIGxpbmtzIGJlbG93KSBpbiB0aGUgZm9sbG93aW5nIHdheToKPiA+PiAxKSBQYXRj aC9wYXRjaHNldCBmb3IgT09CIGxheW91dAo+ID4+IDIpIFBhdGNoc2V0IGZvciAibmFuZC1yYiIg bG9naWMgKG1lc29uX25hbmQuYyArIERUIGJpbmRpbmdzKQo+ID4+IFRoZXNlIHR3byBjYW4gYWxz byBnbyBpbmRlcGVuZGVudGx5Ogo+ID4+IDMpIGh0dHBzOi8vbG9yZS5rZXJuZWwub3JnL2xpbnV4 LW10ZC8yMDIzMDYwMTA2MTg1MC4zOTA3ODAwLTYtQVZLcmFzbm92QHNiZXJkZXZpY2VzLnJ1Lwo+ ID4+IDQpIGh0dHBzOi8vbG9yZS5rZXJuZWwub3JnL2xpbnV4LW10ZC8yMDIzMDYwMTA2MTg1MC4z OTA3ODAwLTctQVZLcmFzbm92QHNiZXJkZXZpY2VzLnJ1LyAgCj4gPiAKPiA+IExHVE0uICAKPiAK PiBJIHRoaW5rIHdlIGRvbid0IG5lZWQgdGhpcyBwYXRjaCB3aXRoIG5ldyBSQl9JTlQgdmFsdWUu IEkgZGl2ZSBpbnRvIGNvbnZlcnNhdGlvbnMgd2l0aCBMaWFuZyBZYW5nIC0gYXV0aG9yIG9mIHRo aXMgZHJpdmVyLiBIZSBzYWlkLAo+IHRoYXQgdGhpcyBkZWZpbmUgaXMgInNwZWNpYWwiIHBvbGxp bmcgbW9kZS4gTm93IEknbSBhIGxpdHRsZSBiaXQgbW9yZSBleHBlcmllbmNlZCBpbiBOQU5EIGFy ZWEsIHNvIElJVUMgd2UgaGF2ZSB0d28gYmFzaWMgd2FpdGluZyBtb2RlczoKPiAxKSBTb2Z0d2Fy ZSwgYnkgc2VuZGluZyBzdGF0dXMgY29tbWFuZCwgdGhlbiBwb2xsaW5nIHJlcGx5IGZyb20gY29u dHJvbGxlciwgYW5kIHRoZW4gZmluYWxseSBzZW5kIFJFQUQwIHRvIGV4aXQgc3RhdHVzIHJlYWRp bmcgbW9kZSAobmFuZF9zb2Z0X3dhaXRyZHkoKSkuCgpUaGlzIGlzIHVzZWZ1bC4uLgoKPiAyKSBC eSBSQiBwaW4gYW5kIGludGVycnVwdCAtIGluIHRoaXMgbW9kZSB3ZSBzZW5kIHZlbmRvciBzcGVj aWZpYyBjb21tYW5kIHRvIHRoZSBjb250cm9sbGVyIGFuZCBpdCB0cmlnZ2VycyBpbnRlcnJ1cHQg b24gUkIgcGluIHVwZGF0ZS4KPiAgICBJbiB0aGlzIGNhc2UgUkIgcGluIG11c3QgYmUgY29ubmVj dGVkIHRvIHRoZSBjb250cm9sbGVyLiBUaGlzIG1vZGUgaXMgYWxyZWFkeSBpbXBsZW1lbnRlZCBi eSBMaWFuZyBZYW5nLgoKLi4udGhpcyBpcyB1c2VmdWwuLi4KCj4gCj4gTm93LCBjb21tYW5kIHdp dGggdGhpcyBuZXcgZGVmaW5lIHdvcmtzIGluIHRoZSBmb2xsb3dpbmcgd2F5OiB3ZSBzZW5kIHN0 YXR1cyBjb21tYW5kLCBieSBpbnN0ZWFkIG9mIHJlYWRpbmcgcmVwbHkgZnJvbSBpdCBieSBzb2Z0 d2FyZSwKPiBjb250cm9sbGVyIGl0c2VsZiBjaGVja3MgUkIgcGluIGFuZCBzdGF0dXMgcmVhZHkg Yml0IGluIElPIGJ1cy4gRHJpdmVyIGp1c3Qgd2FpdHMgb24gY29tcGxldGlvbi4gQWZ0ZXIgd2Fp dGluZyB3ZSBuZWVkIHRvIHNlbmQKPiBSRUFEMCBjb21tYW5kIGFnYWluIHRvIG1ha2UgY29udHJv bGxlciBsZWF2ZSBzdGF0dXMgcmVhZGluZyBtb2RlLiBJIHRoaW5rIHRoaXMgaXMgbGlrZSAiaW50 ZXJtZWRpYXRlIiBtb2RlIGJldHdlZW4gc29mdHdhcmUgcG9sbGluZwo+IGFuZCBoYXJkd2FyZSBp bnRlcnJ1cHQgLSB0aGVyZSBpcyBubyBuZWVkIHRvIHNwaW4gaW4gbG9vcCwgd2FpdGluZyBmb3Ig c3RhdHVzIHJlYWR5IGJpdCwgYnV0IHN0aWxsIG5lZWQgdG8gbGVhdmUgc3RhdHVzIG1vZGUgYnkg c2VuZGluZwo+IFJFQUQwIGNvbW1hbmQuIEknbSBub3Qgc3VyZSB0aGF0IHdlIG5lZWQgdGhpcyBh cyB0aGlyZCBtb2RlIG9mIHdhaXRpbmcgZm9yIGNvbW1hbmQgaXMgZG9uZS4gTWF5IGJlIGF0IGxl YXN0IG5vdCBpbiB0aGlzIHdvcmsgb24gTWVzb24gZHJpdmVyLAo+IHNvIEkgZ3Vlc3MgdG8gZHJv cCB0aGlzIHBhdGNoIGF0ICB0aGlzIG1vbWVudCBhbmQgYWRkICduYW5kX3NvZnRfd2FpdHJkeSgp JyBzdXBwb3J0LgoKLi4uSSBhZ3JlZSB3ZSBjYW4gc2tpcCB0aGlzIG9uZS4KClRoYW5rcywKTWlx dcOobAoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGlu dXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRl YWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgt YXJtLWtlcm5lbAo=