[{"id":3188552,"web_url":"http://patchwork.ozlabs.org/comment/3188552/","msgid":"","list_archive_url":null,"date":"2023-09-27T09:02:02","subject":"Re: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","submitter":{"id":24878,"url":"http://patchwork.ozlabs.org/api/people/24878/","name":"Mark Brown","email":"broonie@kernel.org"},"content":"On Tue, Sep 26, 2023 at 10:08:18PM +0100, Fabrizio Castro wrote:\n\n> The CSI IP found inside the Renesas RZ/V2M SoC supports\n> both SPI Master and SPI Slave roles.\n\nPrefer controller and device.","headers":{"Return-Path":"\n ","X-Original-To":["incoming-dt@patchwork.ozlabs.org","devicetree@vger.kernel.org"],"Delivered-To":"patchwork-incoming-dt@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=U+C5aCr1;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=permerror (SPF Permanent Error: More than 10 MX records returned)\n smtp.mailfrom=vger.kernel.org (client-ip=2604:1380:40f1:3f00::1;\n helo=sy.mirrors.kernel.org;\n envelope-from=devicetree+bounces-3725-incoming-dt=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from sy.mirrors.kernel.org (sy.mirrors.kernel.org\n [IPv6:2604:1380:40f1:3f00::1])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange X25519 server-signature ECDSA (secp384r1))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4RwVwx2nlSz1yp0\n\tfor ;\n Wed, 27 Sep 2023 19:02:09 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sy.mirrors.kernel.org (Postfix) with ESMTP id 7DEE3B20AE3\n\tfor ; Wed, 27 Sep 2023 09:02:08 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 7AED91F60B;\n\tWed, 27 Sep 2023 09:02:06 +0000 (UTC)","from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org\n [10.30.226.201])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 584EE1F604\n\tfor ; Wed, 27 Sep 2023 09:02:05 +0000 (UTC)","by smtp.kernel.org (Postfix) with ESMTPSA id 661CAC433C7;\n\tWed, 27 Sep 2023 09:02:05 +0000 (UTC)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1695805325;\n\tbh=NV3CQINOR3lLeasFFHKqaebi0Y2ZJ3Da2K0ghEVndvk=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=U+C5aCr1b1Pf9qpCyCXMWmkBS4e9877ocdcpipFjyK2AlldG6OQvIc5Lh/66hIj1p\n\t gMrANA0eF5mYhtiaR4lk/afnIWB/8cl0D1lN2ywOFolD6dYkbTDVsGtGfE+go8gkKE\n\t AuLIJcLoCgcmkXkCnMaIrZ04hBOmteJq/ttIrOeWqb2F8fr+d7a61wmoEUoVVCpQ1w\n\t g5fGartvWQ7MJ9dkpTrW1R9oHKCVa9MTS7yNoTPfdZ91mBLaWYHpzSQIWZ+L+45st9\n\t vDu0MSsnm9d80g/khvDnm57KqJNtdrkq/0q4OKnUZlc1u9wv1IlWq/vhLJUsOKOHrh\n\t 4z0/Rf9Ay9SXg==","Date":"Wed, 27 Sep 2023 11:02:02 +0200","From":"Mark Brown ","To":"Fabrizio Castro ","Cc":"Rob Herring ,\n\tKrzysztof Kozlowski ,\n\tConor Dooley ,\n\tGeert Uytterhoeven ,\n\tMagnus Damm , linux-spi@vger.kernel.org,\n\tdevicetree@vger.kernel.org, linux-kernel@vger.kernel.org,\n\tlinux-renesas-soc@vger.kernel.org,\n\tChris Paterson ,\n\tBiju Das ,\n\tLad Prabhakar ","Subject":"Re: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","Message-ID":"","References":"<20230926210818.197356-1-fabrizio.castro.jz@renesas.com>\n <20230926210818.197356-3-fabrizio.castro.jz@renesas.com>","Precedence":"bulk","X-Mailing-List":"devicetree@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"multipart/signed; micalg=pgp-sha512;\n\tprotocol=\"application/pgp-signature\"; boundary=\"ndibdbb3gqomR4sh\"","Content-Disposition":"inline","In-Reply-To":"<20230926210818.197356-3-fabrizio.castro.jz@renesas.com>","X-Cookie":"Save energy: Drive a smaller shell."}},{"id":3188568,"web_url":"http://patchwork.ozlabs.org/comment/3188568/","msgid":"","list_archive_url":null,"date":"2023-09-27T09:12:49","subject":"Re: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","submitter":{"id":703,"url":"http://patchwork.ozlabs.org/api/people/703/","name":"Geert Uytterhoeven","email":"geert@linux-m68k.org"},"content":"Hi Mark,\n\nOn Wed, Sep 27, 2023 at 11:02 AM Mark Brown wrote:\n> On Tue, Sep 26, 2023 at 10:08:18PM +0100, Fabrizio Castro wrote:\n>\n> > The CSI IP found inside the Renesas RZ/V2M SoC supports\n> > both SPI Master and SPI Slave roles.\n>\n> Prefer controller and device.\n\nYou mean host and target?\n(oops, got the latter wrong in my previous email, too ;-)\n\nGr{oetje,eeting}s,\n\n Geert\n\n\n--\nGeert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org\n\nIn personal conversations with technical people, I call myself a hacker. But\nwhen I'm talking to journalists I just say \"programmer\" or something like that.\n -- Linus Torvalds","headers":{"Return-Path":"\n ","X-Original-To":["incoming-dt@patchwork.ozlabs.org","devicetree@vger.kernel.org"],"Delivered-To":"patchwork-incoming-dt@legolas.ozlabs.org","Authentication-Results":"legolas.ozlabs.org;\n spf=permerror (SPF Permanent Error: More than 10 MX records returned)\n smtp.mailfrom=vger.kernel.org (client-ip=2604:1380:45e3:2400::1;\n helo=sv.mirrors.kernel.org;\n envelope-from=devicetree+bounces-3735-incoming-dt=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","Received":["from sv.mirrors.kernel.org (sv.mirrors.kernel.org\n [IPv6:2604:1380:45e3:2400::1])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange X25519 server-signature ECDSA (secp384r1))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4RwW9m1ZXfz1yqW\n\tfor ;\n Wed, 27 Sep 2023 19:13:16 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sv.mirrors.kernel.org (Postfix) with ESMTP id F0B58281695\n\tfor ; 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Wed, 27\n Sep 2023 02:13:02 -0700 (PDT)"],"Precedence":"bulk","X-Mailing-List":"devicetree@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20230926210818.197356-1-fabrizio.castro.jz@renesas.com>\n <20230926210818.197356-3-fabrizio.castro.jz@renesas.com>\n ","In-Reply-To":"","From":"Geert Uytterhoeven ","Date":"Wed, 27 Sep 2023 11:12:49 +0200","X-Gmail-Original-Message-ID":"\n ","Message-ID":"\n ","Subject":"Re: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","To":"Mark Brown ","Cc":"Fabrizio Castro ,\n Rob Herring ,\n\tKrzysztof Kozlowski ,\n Conor Dooley ,\n\tGeert Uytterhoeven ,\n Magnus Damm ,\n\tlinux-spi@vger.kernel.org, devicetree@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,\n\tChris Paterson ,\n Biju Das ,\n\tLad Prabhakar ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-Spam-Status":"No, score=-1.4 required=5.0 tests=BAYES_00,\n\tFREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,\n\tRCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS\n\tautolearn=no autolearn_force=no version=3.4.6","X-Spam-Checker-Version":"SpamAssassin 3.4.6 (2021-04-09) on\n\tlindbergh.monkeyblade.net"}},{"id":3188572,"web_url":"http://patchwork.ozlabs.org/comment/3188572/","msgid":"","list_archive_url":null,"date":"2023-09-27T09:15:29","subject":"Re: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","submitter":{"id":24878,"url":"http://patchwork.ozlabs.org/api/people/24878/","name":"Mark Brown","email":"broonie@kernel.org"},"content":"On Wed, Sep 27, 2023 at 11:12:49AM +0200, Geert Uytterhoeven wrote:\n> On Wed, Sep 27, 2023 at 11:02 AM Mark Brown wrote:\n\n> > Prefer controller and device.\n\n> You mean host and target?\n> (oops, got the latter wrong in my previous email, too ;-)\n\nThose also work, yes and there's less chance of confusion for the\ncontroller bit.","headers":{"Return-Path":"\n ","X-Original-To":["incoming-dt@patchwork.ozlabs.org","devicetree@vger.kernel.org"],"Delivered-To":"patchwork-incoming-dt@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=CIr6kxnX;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=permerror (SPF Permanent Error: More than 10 MX records returned)\n smtp.mailfrom=vger.kernel.org (client-ip=147.75.48.161;\n helo=sy.mirrors.kernel.org;\n envelope-from=devicetree+bounces-3737-incoming-dt=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from sy.mirrors.kernel.org (sy.mirrors.kernel.org [147.75.48.161])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange X25519 server-signature ECDSA (secp384r1))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4RwWDS115Dz1yp0\n\tfor ;\n Wed, 27 Sep 2023 19:15:36 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sy.mirrors.kernel.org (Postfix) with ESMTP id C9C79B209B8\n\tfor ; Wed, 27 Sep 2023 09:15:35 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id E9ED920B03;\n\tWed, 27 Sep 2023 09:15:32 +0000 (UTC)","from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org\n [10.30.226.201])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id C6ECE208CA\n\tfor ; Wed, 27 Sep 2023 09:15:32 +0000 (UTC)","by smtp.kernel.org (Postfix) with ESMTPSA id DE51AC433C9;\n\tWed, 27 Sep 2023 09:15:31 +0000 (UTC)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1695806132;\n\tbh=8igskYP9DAYLL5BkUN44/CdlHV/Mw6iIVgqVj3quSNA=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=CIr6kxnXH3pNiI03CWn0VRQusJvmXnl05H0S/6tJttkoPRIBzM6b0HAKACG7eUt7L\n\t 0A45Y8WSDoETfTvJFhAi87L2x3wGvoBEpRlDJhU0J5ljJ3ZXjw/9BBm7XD8dkoGMys\n\t sQgWnlYpBTnNldge90gMmkQ3P4zen8WAZrFEuLldDHEjgdxkhwrfa1Tw9yGr0o3Gup\n\t ZJl/77HJO87YX33GMlAKc9iICxyQLaXfi1+ZdIv0W74UPuWFcAjqJBlkhBaxMKwKjf\n\t 7h8s2kvUOX/lwmd0J4mNr0hocvq8FtB1ybKObQjpkjImMm/NjO4C5G/VG3YS/FaItD\n\t YKFdpkGjpHTyA==","Date":"Wed, 27 Sep 2023 11:15:29 +0200","From":"Mark Brown ","To":"Geert Uytterhoeven ","Cc":"Fabrizio Castro ,\n\tRob Herring ,\n\tKrzysztof Kozlowski ,\n\tConor Dooley ,\n\tGeert Uytterhoeven ,\n\tMagnus Damm , linux-spi@vger.kernel.org,\n\tdevicetree@vger.kernel.org, linux-kernel@vger.kernel.org,\n\tlinux-renesas-soc@vger.kernel.org,\n\tChris Paterson ,\n\tBiju Das ,\n\tLad Prabhakar ","Subject":"Re: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","Message-ID":"","References":"<20230926210818.197356-1-fabrizio.castro.jz@renesas.com>\n <20230926210818.197356-3-fabrizio.castro.jz@renesas.com>\n \n ","Precedence":"bulk","X-Mailing-List":"devicetree@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"multipart/signed; micalg=pgp-sha512;\n\tprotocol=\"application/pgp-signature\"; boundary=\"7Q6HPrYwTOa6SDxa\"","Content-Disposition":"inline","In-Reply-To":"\n ","X-Cookie":"Save energy: Drive a smaller shell."}},{"id":3188603,"web_url":"http://patchwork.ozlabs.org/comment/3188603/","msgid":"","list_archive_url":null,"date":"2023-09-27T09:51:39","subject":"Re: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","submitter":{"id":703,"url":"http://patchwork.ozlabs.org/api/people/703/","name":"Geert Uytterhoeven","email":"geert@linux-m68k.org"},"content":"Hi Fabrizio,\n\nOn Tue, Sep 26, 2023 at 11:08 PM Fabrizio Castro\n wrote:\n> The CSI IP found inside the Renesas RZ/V2M SoC supports\n> both SPI Master and SPI Slave roles.\n>\n> When working in slave mode, the CSI IP has the option\n> of using its Slave Select (SS) pin to enable TX and RX\n> operations. Since the SPI slave cannot control the clock,\n> when working as slave it's best not to stop operations\n> during a transfer, as by doing so the IP will not send or\n> receive data, regardless of clock and active level on pin SS.\n> A side effect from not stopping operations is that the RX\n> FIFO needs to be flushed, word by word, when RX data needs\n> to be discarded.\n>\n> Finally, when in slave mode timings are tighter, as missing a\n> deadline translates to errors being thrown, resulting in\n> aborting the transfer. In order to speed things up, we can\n> avoid waiting for the TX FIFO to be empty, we can just wait\n> for the RX FIFO to contain at least the number of words that\n> we expect.\n>\n> Add slave support to the currently existing CSI driver.\n>\n> Signed-off-by: Fabrizio Castro \n\nThanks for your patch!\n\n> --- a/drivers/spi/Kconfig\n> +++ b/drivers/spi/Kconfig\n> @@ -861,8 +861,10 @@ config SPI_RSPI\n> config SPI_RZV2M_CSI\n> tristate \"Renesas RZ/V2M CSI controller\"\n> depends on ARCH_RENESAS || COMPILE_TEST\n> + depends on SPI_SLAVE\n\nIsn't that a bit too strict?\nThe driver can/should be used/usable in host mode when SPI_SLAVE\nis not enabled.\n\n> help\n> - SPI driver for Renesas RZ/V2M Clocked Serial Interface (CSI)\n> + SPI driver for Renesas RZ/V2M Clocked Serial Interface (CSI).\n> + CSI supports master and slave roles.\n>\n> config SPI_QCOM_QSPI\n> tristate \"QTI QSPI controller\"\n\n> --- a/drivers/spi/spi-rzv2m-csi.c\n> +++ b/drivers/spi/spi-rzv2m-csi.c\n\n> @@ -99,6 +112,9 @@ struct rzv2m_csi_priv {\n> wait_queue_head_t wait;\n> u32 errors;\n> u32 status;\n> + int mode;\n\nDo you need this flag?\nYou can use spi_controller_is_target() instead.\n\n> + int slave_select;\n> + bool slave_aborted;\n> };\n>\n> static void rzv2m_csi_reg_write_bit(const struct rzv2m_csi_priv *csi,\n\n> @@ -279,32 +303,23 @@ static int rzv2m_csi_wait_for_interrupt(struct rzv2m_csi_priv *csi,\n>\n> rzv2m_csi_enable_irqs(csi, enable_bits);\n>\n> - ret = wait_event_timeout(csi->wait,\n> - ((csi->status & wait_mask) == wait_mask) ||\n> - csi->errors, HZ);\n> + if (csi->mode == RZV2M_CSI_SPI_SLAVE) {\n\nspi_controller_is_target()\n\n> + ret = wait_event_interruptible(csi->wait,\n> + ((csi->status & wait_mask) == wait_mask) ||\n> + csi->errors || csi->slave_aborted);\n\ntarget_aborted (everywhere)\n\n> + if (ret || csi->slave_aborted)\n> + ret = -EINTR;\n> + } else {\n> + ret = wait_event_timeout(csi->wait,\n> + ((csi->status & wait_mask) == wait_mask) ||\n> + csi->errors, HZ) == 0 ? -ETIMEDOUT : 0;\n> + }\n\nGr{oetje,eeting}s,\n\n Geert","headers":{"Return-Path":"\n ","X-Original-To":["incoming-dt@patchwork.ozlabs.org","devicetree@vger.kernel.org"],"Delivered-To":"patchwork-incoming-dt@legolas.ozlabs.org","Authentication-Results":"legolas.ozlabs.org;\n spf=permerror (SPF Permanent Error: More than 10 MX records returned)\n smtp.mailfrom=vger.kernel.org (client-ip=2604:1380:45e3:2400::1;\n helo=sv.mirrors.kernel.org;\n envelope-from=devicetree+bounces-3756-incoming-dt=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","Received":["from sv.mirrors.kernel.org (sv.mirrors.kernel.org\n [IPv6:2604:1380:45e3:2400::1])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4RwX2T4NY2z1yp8\n\tfor ;\n Wed, 27 Sep 2023 19:52:00 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sv.mirrors.kernel.org (Postfix) with ESMTP id 70C17281B16\n\tfor ; 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Wed, 27 Sep\n 2023 02:51:52 -0700 (PDT)"],"Precedence":"bulk","X-Mailing-List":"devicetree@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20230926210818.197356-1-fabrizio.castro.jz@renesas.com>\n <20230926210818.197356-3-fabrizio.castro.jz@renesas.com>","In-Reply-To":"<20230926210818.197356-3-fabrizio.castro.jz@renesas.com>","From":"Geert Uytterhoeven ","Date":"Wed, 27 Sep 2023 11:51:39 +0200","X-Gmail-Original-Message-ID":"\n ","Message-ID":"\n ","Subject":"Re: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","To":"Fabrizio Castro ","Cc":"Mark Brown , Rob Herring ,\n\tKrzysztof Kozlowski ,\n Conor Dooley ,\n\tGeert Uytterhoeven ,\n Magnus Damm ,\n\tlinux-spi@vger.kernel.org, devicetree@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,\n\tChris Paterson ,\n Biju Das ,\n\tLad Prabhakar ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-Spam-Status":"No, score=-1.4 required=5.0 tests=BAYES_00,\n\tFREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,\n\tRCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS\n\tautolearn=no autolearn_force=no version=3.4.6","X-Spam-Checker-Version":"SpamAssassin 3.4.6 (2021-04-09) on\n\tlindbergh.monkeyblade.net"}},{"id":3188616,"web_url":"http://patchwork.ozlabs.org/comment/3188616/","msgid":"","list_archive_url":null,"date":"2023-09-27T10:05:18","subject":"RE: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","submitter":{"id":80106,"url":"http://patchwork.ozlabs.org/api/people/80106/","name":"Fabrizio Castro","email":"fabrizio.castro.jz@renesas.com"},"content":"Hi Geert,\n\nThanks for your reply!\n\n> From: Geert Uytterhoeven \n> Subject: Re: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support\n> \n> Hi Fabrizio,\n> \n> On Tue, Sep 26, 2023 at 11:08 PM Fabrizio Castro\n> wrote:\n> > The CSI IP found inside the Renesas RZ/V2M SoC supports\n> > both SPI Master and SPI Slave roles.\n> >\n> > When working in slave mode, the CSI IP has the option\n> > of using its Slave Select (SS) pin to enable TX and RX\n> > operations. Since the SPI slave cannot control the clock,\n> > when working as slave it's best not to stop operations\n> > during a transfer, as by doing so the IP will not send or\n> > receive data, regardless of clock and active level on pin SS.\n> > A side effect from not stopping operations is that the RX\n> > FIFO needs to be flushed, word by word, when RX data needs\n> > to be discarded.\n> >\n> > Finally, when in slave mode timings are tighter, as missing a\n> > deadline translates to errors being thrown, resulting in\n> > aborting the transfer. In order to speed things up, we can\n> > avoid waiting for the TX FIFO to be empty, we can just wait\n> > for the RX FIFO to contain at least the number of words that\n> > we expect.\n> >\n> > Add slave support to the currently existing CSI driver.\n> >\n> > Signed-off-by: Fabrizio Castro \n> \n> Thanks for your patch!\n> \n> > --- a/drivers/spi/Kconfig\n> > +++ b/drivers/spi/Kconfig\n> > @@ -861,8 +861,10 @@ config SPI_RSPI\n> > config SPI_RZV2M_CSI\n> > tristate \"Renesas RZ/V2M CSI controller\"\n> > depends on ARCH_RENESAS || COMPILE_TEST\n> > + depends on SPI_SLAVE\n> \n> Isn't that a bit too strict?\n> The driver can/should be used/usable in host mode when SPI_SLAVE\n> is not enabled.\n\nGood point, I'll take this dependency out.\n\n> \n> > help\n> > - SPI driver for Renesas RZ/V2M Clocked Serial Interface\n> (CSI)\n> > + SPI driver for Renesas RZ/V2M Clocked Serial Interface\n> (CSI).\n> > + CSI supports master and slave roles.\n> >\n> > config SPI_QCOM_QSPI\n> > tristate \"QTI QSPI controller\"\n> \n> > --- a/drivers/spi/spi-rzv2m-csi.c\n> > +++ b/drivers/spi/spi-rzv2m-csi.c\n> \n> > @@ -99,6 +112,9 @@ struct rzv2m_csi_priv {\n> > wait_queue_head_t wait;\n> > u32 errors;\n> > u32 status;\n> > + int mode;\n> \n> Do you need this flag?\n\nNope, it's just that testing it is going to be slightly faster.\n\n> You can use spi_controller_is_target() instead.\n\nWill do.\n\n> \n> > + int slave_select;\n> > + bool slave_aborted;\n> > };\n> >\n> > static void rzv2m_csi_reg_write_bit(const struct rzv2m_csi_priv\n> *csi,\n> \n> > @@ -279,32 +303,23 @@ static int rzv2m_csi_wait_for_interrupt(struct\n> rzv2m_csi_priv *csi,\n> >\n> > rzv2m_csi_enable_irqs(csi, enable_bits);\n> >\n> > - ret = wait_event_timeout(csi->wait,\n> > - ((csi->status & wait_mask) ==\n> wait_mask) ||\n> > - csi->errors, HZ);\n> > + if (csi->mode == RZV2M_CSI_SPI_SLAVE) {\n> \n> spi_controller_is_target()\n\nWill change.\n\n> \n> > + ret = wait_event_interruptible(csi->wait,\n> > + ((csi->status & wait_mask) ==\n> wait_mask) ||\n> > + csi->errors || csi->slave_aborted);\n> \n> target_aborted (everywhere)\n\nWill change.\n\nCheers,\nFab\n\n> \n> > + if (ret || csi->slave_aborted)\n> > + ret = -EINTR;\n> > + } else {\n> > + ret = wait_event_timeout(csi->wait,\n> > + ((csi->status & wait_mask) ==\n> wait_mask) ||\n> > + csi->errors, HZ) == 0 ? -ETIMEDOUT :\n> 0;\n> > + }\n> \n> Gr{oetje,eeting}s,\n> \n> Geert\n> \n> --\n> Geert Uytterhoeven -- There's lots of Linux beyond ia32 --\n> geert@linux-m68k.org\n> \n> In personal conversations with technical people, I call myself a\n> hacker. But\n> when I'm talking to journalists I just say \"programmer\" or something\n> like that.\n> -- Linus Torvalds","headers":{"Return-Path":"\n ","X-Original-To":["incoming-dt@patchwork.ozlabs.org","devicetree@vger.kernel.org"],"Delivered-To":"patchwork-incoming-dt@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=renesas.com header.i=@renesas.com header.a=rsa-sha256\n header.s=selector1 header.b=NoOPUEBp;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=permerror (SPF Permanent Error: More than 10 MX records returned)\n smtp.mailfrom=vger.kernel.org (client-ip=2604:1380:45d1:ec00::1;\n helo=ny.mirrors.kernel.org;\n envelope-from=devicetree+bounces-3762-incoming-dt=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","dkim=none (message not signed)\n header.d=none;dmarc=none action=none header.from=renesas.com;"],"Received":["from ny.mirrors.kernel.org (ny.mirrors.kernel.org\n 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Brown , Rob Herring ,\n\tKrzysztof Kozlowski , Conor Dooley\n\t, Geert Uytterhoeven , Magnus\n Damm , \"linux-spi@vger.kernel.org\"\n\t, \"devicetree@vger.kernel.org\"\n\t, \"linux-kernel@vger.kernel.org\"\n\t, \"linux-renesas-soc@vger.kernel.org\"\n\t, Chris Paterson\n\t, Biju Das , Prabhakar\n Mahadev Lad ","Subject":"RE: [PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","Thread-Topic":"[PATCH 2/2] spi: rzv2m-csi: Add Slave mode support","Thread-Index":"AQHZ8L2ejUaaZDAgQ0CDGG2+qUjFFbAubvCAgAABB5A=","Date":"Wed, 27 Sep 2023 10:05:18 +0000","Message-ID":"\n ","References":"<20230926210818.197356-1-fabrizio.castro.jz@renesas.com>\n <20230926210818.197356-3-fabrizio.castro.jz@renesas.com>\n ","In-Reply-To":"\n ","Accept-Language":"en-GB, en-US","Content-Language":"en-US","X-MS-Has-Attach":"","X-MS-TNEF-Correlator":"","authentication-results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=renesas.com header.i=@renesas.com header.a=rsa-sha256\n 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