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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 067BBC6FD1F for ; Thu, 9 Mar 2023 14:20:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231794AbjCIOUo (ORCPT ); Thu, 9 Mar 2023 09:20:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38060 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231725AbjCIOUP (ORCPT ); Thu, 9 Mar 2023 09:20:15 -0500 Received: from mail-wr1-x432.google.com (mail-wr1-x432.google.com [IPv6:2a00:1450:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30188BF399; Thu, 9 Mar 2023 06:20:10 -0800 (PST) Received: by mail-wr1-x432.google.com with SMTP id g3so2033708wri.6; Thu, 09 Mar 2023 06:20:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1678371608; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=g9PFCuPFcq1FIHz8HOZSI5nxjlQ6hpHQldXpRzabQWk=; b=pQ8rH9hmAvMGPdlWLtsaiCL1tbAk6J5Bet/1wrFc3yD0T50sPxhzJap0s2h/tEDON1 ZyckrHIm+7bwS9K33CaoBmOEZv2I7afmQGc2Er54g/6BTDs+CyEWTFawrPc5lAPk872n dmirs2Ttda4PnqKgROjUd7CIwz9tdnPCkSyzGIlnzIK6bEyGRSqA1H7/Ze090yaenbxK iPzeJNvkLQF6jNvmwsa7eHyXANDHZkBWQs6sisMepYXK+3QyecdSDDX0uIOJQsDjVcfx gAyo8YDxkCaJ9wJqVQYaGvOmMuszKOMwbyHS/bu+S6gVRzJL6eI6sGaSbulGjMzjlnVQ sYJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678371608; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=g9PFCuPFcq1FIHz8HOZSI5nxjlQ6hpHQldXpRzabQWk=; b=xFMfRC9HlTvcN8cA8S5lBKg9TAPjgd8DgspIL6eI4iwtEXmoKcAOvYtdS1Om4+4MHN QErD9O49XcbcSOitRv2tIFbxBvGU10xaq3+NNqAC84qPyXKXW9Q/6zTZZWPmY7h7Cb3l IS2zf0wHDm/YSW3e1yeXHVd69vzqpepCIW2BEt/Aet1xDZbZZnp0bElxNyRl2hGCIfeo IzngZd+z7cgyGQ+30aqbwueEHKTyBQQaZUwpBVQCOKvi/5vghPk7310HvuhalpQJ/KvJ gEMkF4X493ToOmKZKvn4O43D5otS8YPwhs+tHZAnyan059QHa3JIZ8BVsNHT+ZFXZkgM /bqQ== X-Gm-Message-State: AO0yUKX4H5YaTQXMG6UimAe8iQKyLDEn/Njf2qc4D4wBnpGK/VEfK+EW Z4pLAbNdTekirveibikhiQl98QxHWterhlcvUyk= X-Google-Smtp-Source: AK7set+Yd9KrImooA6uxrXUVmDh+Rcs9q/1b8CgKBFtf9L4gNgxW+NQjjkIdwpsMyntXGCBQF88sBj/dwaEvM3BdnWg= X-Received: by 2002:adf:dd4f:0:b0:2c5:5297:1f9a with SMTP id u15-20020adfdd4f000000b002c552971f9amr4901402wrm.14.1678371608475; Thu, 09 Mar 2023 06:20:08 -0800 (PST) MIME-Version: 1.0 References: <20220911174551.653599-1-sergiu.moga@microchip.com> <20220925220304.buk3yuqoh6vszfci@mobilestation> <18e6e8a8-6412-7e31-21e0-6becd4400ac1@microchip.com> <20220926172454.kbpzck7med5bopre@mobilestation> <1766f6ef-d9d8-04f7-a6bf-0ea6bc0b3d23@linaro.org> <1849e2c8-54f5-9e56-4ed8-8b0e4a826d04@linaro.org> <302ecf0421fe4c99fca3eb0ca2f66127@walle.cc> <5183a184-c72d-3acd-70cd-6aa1e31533f5@linaro.org> <03a9f117316ab81f1b5a18100f771e65@walle.cc> <6c2090bf-d102-a333-3a83-03abe81ff70e@linaro.org> <460ef5ff3846b409b322ca53559e2476@walle.cc> In-Reply-To: From: Chuanhong Guo Date: Thu, 9 Mar 2023 22:19:55 +0800 Message-ID: Subject: Re: [PATCH] spi: Replace `dummy.nbytes` with `dummy.ncycles` To: Michael Walle Cc: Tudor Ambarus , Serge Semin , Sergiu.Moga@microchip.com, Mark Brown , Tudor Ambarus , Pratyush Yadav , miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, Nicolas.Ferre@microchip.com, alexandre.belloni@bootlin.com, Claudiu.Beznea@microchip.com, chin-ting_kuo@aspeedtech.com, clg@kaod.org, joel@jms.id.au, andrew@aj.id.au, kdasu.kdev@gmail.com, han.xu@nxp.com, john.garry@huawei.com, matthias.bgg@gmail.com, avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, haibo.chen@nxp.com, yogeshgaur.83@gmail.com, heiko@sntech.de, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, michal.simek@xilinx.com, bcm-kernel-feedback-list@broadcom.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, openbmc@lists.ozlabs.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! On Thu, Mar 9, 2023 at 10:04=E2=80=AFPM Michael Walle wr= ote: > > Am 2023-03-09 14:54, schrieb Tudor Ambarus: > > On 09.03.2023 15:33, Michael Walle wrote: > >>>>> The controllers that can talk in dummy ncycles don't need the > >>>>> dummy.{buswidth, dtr} fields. > >>>>> > >>>>> The controllers that can't talk in dummy cycles, but only on a > >>>>> "byte" > >>>>> boundary need both buswidth and dtr fields. Assume a flash needs 32 > >>>>> dummy cycles for an op on 8D-8D-8D mode. If the controller does not > >>>>> have > >>>>> the buswidth and dtr info, it can't convert the dummy ncycles to > >>>>> nbytes. > >>>>> If he knows only that buswidth is 8, it will convert ncycles to 4 > >>>>> bytes. > >>>>> If dtr is also specified it converts ncycles to 2 bytes. > >>>> > >>>> No they don't need it. Lets take your semper flash and assume it > >>>> needs > >>>> 12 latency cycles. SPI-NOR will set ncycles to 12 *regardless of the > >>>> mode > >>>> or dtr setting*. The controller then knows we need 12 clock cycles. > >>>> It has > >>>> then to figure out how that can be achieved. E.g. if it can only do > >>>> the > >>>> "old" byte programming and is in quad mode, good for it. It will > >>>> send 6 > >>>> dummy bytes, which will result in 12 dummy clock cycles, because 1 > >>>> byte > >>>> takes two clock cycles in quad SDR mode. If its in octal mode, send > >>>> 12 > >>>> bytes. If its in dual mode, send 3 bytes. Obiously, it cannot be in > >>>> single bit mode, because it cannot send 1.5 bytes.. > >>>> > >>> > >>> You miss the fact that you can have 1-1-4. What buswidth do you use > >>> for dummy, the address buswidth or the data buswidth? > >> > >> Doesn't matter, does it? The driver is free to chose, 1, 4, or > >> anything > >> else. You don't sample any data during the dummy phase. > >> To answer your question: single for instruction, single for address, > >> whatever you choose for dummy as long as there are ncycles space > >> between > >> address and data, and quad for data. > > > > Huh? How does the controller chose, based on what? > > Based on its own capabilities. It can choose either way. In the end > what matters is how many clock cycles there are between the address > and data phase. And you only need to convey that information to the > SPI controller - your new ncycles. It does matter. Controller may be designed to actively drive MOSI/WP/HOLD during single-spi dummy cycles and WP/HOLD during dual-spi dummy cycles. If the pin modes between the controller and device mismatched, worst case scenario the chip may get fried. --=20 Regards, Chuanhong Guo 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 E01E1C64EC4 for ; Thu, 9 Mar 2023 14:20:43 +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:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Thu, 09 Mar 2023 06:20:08 -0800 (PST) MIME-Version: 1.0 References: <20220911174551.653599-1-sergiu.moga@microchip.com> <20220925220304.buk3yuqoh6vszfci@mobilestation> <18e6e8a8-6412-7e31-21e0-6becd4400ac1@microchip.com> <20220926172454.kbpzck7med5bopre@mobilestation> <1766f6ef-d9d8-04f7-a6bf-0ea6bc0b3d23@linaro.org> <1849e2c8-54f5-9e56-4ed8-8b0e4a826d04@linaro.org> <302ecf0421fe4c99fca3eb0ca2f66127@walle.cc> <5183a184-c72d-3acd-70cd-6aa1e31533f5@linaro.org> <03a9f117316ab81f1b5a18100f771e65@walle.cc> <6c2090bf-d102-a333-3a83-03abe81ff70e@linaro.org> <460ef5ff3846b409b322ca53559e2476@walle.cc> In-Reply-To: From: Chuanhong Guo Date: Thu, 9 Mar 2023 22:19:55 +0800 Message-ID: Subject: Re: [PATCH] spi: Replace `dummy.nbytes` with `dummy.ncycles` To: Michael Walle Cc: Tudor Ambarus , Serge Semin , Sergiu.Moga@microchip.com, Mark Brown , Tudor Ambarus , Pratyush Yadav , miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, Nicolas.Ferre@microchip.com, alexandre.belloni@bootlin.com, Claudiu.Beznea@microchip.com, chin-ting_kuo@aspeedtech.com, clg@kaod.org, joel@jms.id.au, andrew@aj.id.au, kdasu.kdev@gmail.com, han.xu@nxp.com, john.garry@huawei.com, matthias.bgg@gmail.com, avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, haibo.chen@nxp.com, yogeshgaur.83@gmail.com, heiko@sntech.de, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, michal.simek@xilinx.com, bcm-kernel-feedback-list@broadcom.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, openbmc@lists.ozlabs.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230309_062013_311075_DEDF1065 X-CRM114-Status: GOOD ( 21.57 ) 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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Thu, 09 Mar 2023 06:20:08 -0800 (PST) MIME-Version: 1.0 References: <20220911174551.653599-1-sergiu.moga@microchip.com> <20220925220304.buk3yuqoh6vszfci@mobilestation> <18e6e8a8-6412-7e31-21e0-6becd4400ac1@microchip.com> <20220926172454.kbpzck7med5bopre@mobilestation> <1766f6ef-d9d8-04f7-a6bf-0ea6bc0b3d23@linaro.org> <1849e2c8-54f5-9e56-4ed8-8b0e4a826d04@linaro.org> <302ecf0421fe4c99fca3eb0ca2f66127@walle.cc> <5183a184-c72d-3acd-70cd-6aa1e31533f5@linaro.org> <03a9f117316ab81f1b5a18100f771e65@walle.cc> <6c2090bf-d102-a333-3a83-03abe81ff70e@linaro.org> <460ef5ff3846b409b322ca53559e2476@walle.cc> In-Reply-To: From: Chuanhong Guo Date: Thu, 9 Mar 2023 22:19:55 +0800 Message-ID: Subject: Re: [PATCH] spi: Replace `dummy.nbytes` with `dummy.ncycles` To: Michael Walle Cc: Tudor Ambarus , Serge Semin , Sergiu.Moga@microchip.com, Mark Brown , Tudor Ambarus , Pratyush Yadav , miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, Nicolas.Ferre@microchip.com, alexandre.belloni@bootlin.com, Claudiu.Beznea@microchip.com, chin-ting_kuo@aspeedtech.com, clg@kaod.org, joel@jms.id.au, andrew@aj.id.au, kdasu.kdev@gmail.com, han.xu@nxp.com, john.garry@huawei.com, matthias.bgg@gmail.com, avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, haibo.chen@nxp.com, yogeshgaur.83@gmail.com, heiko@sntech.de, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, michal.simek@xilinx.com, bcm-kernel-feedback-list@broadcom.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, openbmc@lists.ozlabs.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230309_062013_311075_DEDF1065 X-CRM114-Status: GOOD ( 21.57 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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Thu, 09 Mar 2023 06:20:08 -0800 (PST) MIME-Version: 1.0 References: <20220911174551.653599-1-sergiu.moga@microchip.com> <20220925220304.buk3yuqoh6vszfci@mobilestation> <18e6e8a8-6412-7e31-21e0-6becd4400ac1@microchip.com> <20220926172454.kbpzck7med5bopre@mobilestation> <1766f6ef-d9d8-04f7-a6bf-0ea6bc0b3d23@linaro.org> <1849e2c8-54f5-9e56-4ed8-8b0e4a826d04@linaro.org> <302ecf0421fe4c99fca3eb0ca2f66127@walle.cc> <5183a184-c72d-3acd-70cd-6aa1e31533f5@linaro.org> <03a9f117316ab81f1b5a18100f771e65@walle.cc> <6c2090bf-d102-a333-3a83-03abe81ff70e@linaro.org> <460ef5ff3846b409b322ca53559e2476@walle.cc> In-Reply-To: From: Chuanhong Guo Date: Thu, 9 Mar 2023 22:19:55 +0800 Message-ID: Subject: Re: [PATCH] spi: Replace `dummy.nbytes` with `dummy.ncycles` To: Michael Walle X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230309_062013_311075_DEDF1065 X-CRM114-Status: GOOD ( 21.57 ) 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: , Cc: alexandre.belloni@bootlin.com, vigneshr@ti.com, linux-aspeed@lists.ozlabs.org, alexandre.torgue@foss.st.com, tali.perry1@gmail.com, linux-mtd@lists.infradead.org, miquel.raynal@bootlin.com, linux-spi@vger.kernel.org, michal.simek@xilinx.com, tmaimon77@gmail.com, benjaminfair@google.com, kdasu.kdev@gmail.com, richard@nod.at, chin-ting_kuo@aspeedtech.com, Sergiu.Moga@microchip.com, haibo.chen@nxp.com, openbmc@lists.ozlabs.org, yuenn@google.com, Tudor Ambarus , bcm-kernel-feedback-list@broadcom.com, joel@jms.id.au, yogeshgaur.83@gmail.com, linux-rockchip@lists.infradead.org, Tudor Ambarus , john.garry@huawei.com, Mark Brown , linux-mediatek@lists.infradead.org, clg@kaod.org, matthias.bgg@gmail.com, han.xu@nxp.com, linux-arm-kernel@lists.infradead.org, andrew@aj.id.au, venture@google.com, linux-stm32@st-md-mailman.stormreply.com, heiko@sntech.de, Serge Semin , linux-kernel@vger.kernel.org, avifishman70@gmail.com, mcoquelin.stm32@gmail.com, Claudiu.Beznea@microchip.com, Pratyush Yadav Content-Type: text/plain; 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