[{"id":3678700,"web_url":"http://patchwork.ozlabs.org/comment/3678700/","msgid":"","list_archive_url":null,"date":"2026-04-16T14:14:33","subject":"Re: [PATCH] usb: gadget: renesas: add support for RZ/G2L SoC","submitter":{"id":93164,"url":"http://patchwork.ozlabs.org/api/people/93164/","name":"Michele Bisogno","email":"micbis.openwrt@gmail.com"},"content":"Hi Marek,\n\nThank you for the review and the link to the Linux implementation.\n\n> Regulator change should be a separate patch please.\n\nI agree. I will split the regulator changes into a separate patch\nfor the v2 series to keep the subsystem changes distinct.\n\n> drivers/usb/gadget/rcar is pulled from Linux 1b4861e32e46...\n> but none of these changes in this patch are even in Linux next.\n\nThe RZ/G2L support in Linux relies heavily on DMA for data transfers.\nIn U-Boot, we are primarily using the PIO path. The refactoring\nin fifo.c (switching to ioread8/iowrite8) was found to be necessary\nto handle trailing bytes and alignment specifically for the RZ/G2L\nbus when DMA is not active.\n\nAdditionally, the usb_del_gadget_udc() change in common.c addresses\na re-entrancy bug unique to U-Boot's gadget lifecycle. Without\nthis, the UDC list becomes stale, causing the board to crash if\na command like 'ums' is executed more than once.\n\n> The addition of RZ/G2L into USBHS driver in Linux was much simpler\n\nI agree that moving the RZ/G2L specifics in common.c to a platform\ndependent file (similar to Linux) would be the cleaner long-term\narchitecture. However, doing so would require a much more invasive\nrefactoring of the existing driver structure. I opted for these\nminimal changes to maintain stability for existing R-Car Gen3\nusers while enabling RZ/G2L support.\n\nI will prepare a v2 series with the patches split as requested.\n\nKind regards,\nMichele","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=p7cv17Rt;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.b=\"p7cv17Rt\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass smtp.mailfrom=micbis.openwrt@gmail.com"],"Received":["from phobos.denx.de (phobos.denx.de\n [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fxvhR4h96z1yD3\n\tfor ; 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Thu, 16 Apr 2026\n 07:14:44 -0700 (PDT)","MIME-Version":"1.0","References":"<20260415172113.273702-1-micbis.openwrt@gmail.com>\n ","In-Reply-To":"","From":"Michele Bisogno ","Date":"Thu, 16 Apr 2026 16:14:33 +0200","X-Gm-Features":"AQROBzDngIMKMorPF71TpKSKiqtlIgmmuh92e6JcDQyqKmkXry0g28V4-RwtLl4","Message-ID":"\n ","Subject":"Re: [PATCH] usb: gadget: renesas: add support for RZ/G2L SoC","To":"Marek Vasut ","Cc":"u-boot@lists.denx.de, marek.vasut+renesas@mailbox.org, paul@pbarker.dev,\n jh80.chung@samsung.com, peng.fan@nxp.com, lukma@denx.de,\n mkorpershoek@kernel.org, trini@konsulko.com","Content-Type":"text/plain; charset=\"UTF-8\"","X-Mailman-Approved-At":"Fri, 17 Apr 2026 14:43:59 +0200","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}},{"id":3679642,"web_url":"http://patchwork.ozlabs.org/comment/3679642/","msgid":"<5aaaf387-f48b-4fe0-8461-7c3f05e27fe2@mailbox.org>","list_archive_url":null,"date":"2026-04-20T23:15:45","subject":"Re: [PATCH] usb: gadget: renesas: add support for RZ/G2L SoC","submitter":{"id":85664,"url":"http://patchwork.ozlabs.org/api/people/85664/","name":"Marek Vasut","email":"marek.vasut@mailbox.org"},"content":"On 4/16/26 4:14 PM, Michele Bisogno wrote:\n\nHello Michele,\n\n> Thank you for the review and the link to the Linux implementation.\n> \n>> Regulator change should be a separate patch please.\n> \n> I agree. I will split the regulator changes into a separate patch\n> for the v2 series to keep the subsystem changes distinct.\n> \n>> drivers/usb/gadget/rcar is pulled from Linux 1b4861e32e46...\n>> but none of these changes in this patch are even in Linux next.\n> \n> The RZ/G2L support in Linux relies heavily on DMA for data transfers.\n> In U-Boot, we are primarily using the PIO path. The refactoring\n> in fifo.c (switching to ioread8/iowrite8) was found to be necessary\n> to handle trailing bytes and alignment specifically for the RZ/G2L\n> bus when DMA is not active.\n\nIf Linux also contains the PIO code, it would also benefit from matching \nimprovement, right ?\n\n> Additionally, the usb_del_gadget_udc() change in common.c addresses\n> a re-entrancy bug unique to U-Boot's gadget lifecycle. Without\n> this, the UDC list becomes stale, causing the board to crash if\n> a command like 'ums' is executed more than once.\n\nThis should be a separate bugfix patch.\n\n>> The addition of RZ/G2L into USBHS driver in Linux was much simpler\n> \n> I agree that moving the RZ/G2L specifics in common.c to a platform\n> dependent file (similar to Linux) would be the cleaner long-term\n> architecture. However, doing so would require a much more invasive\n> refactoring of the existing driver structure. I opted for these\n> minimal changes to maintain stability for existing R-Car Gen3\n> users while enabling RZ/G2L support.\n> \n> I will prepare a v2 series with the patches split as requested.\n\nIdeally, let's try to keep the Linux and U-Boot driver code base \nsynchronized as much as possible.\n\nThank you !","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=mailbox.org header.i=@mailbox.org header.a=rsa-sha256\n header.s=mail20150812 header.b=SqGptAt1;\n\tdkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org\n header.a=rsa-sha256 header.s=mail20150812 header.b=d1TwRccn;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=reject dis=none) header.from=mailbox.org","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (2048-bit key;\n secure) header.d=mailbox.org header.i=@mailbox.org header.b=\"SqGptAt1\";\n\tdkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org\n header.b=\"d1TwRccn\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=reject dis=none) header.from=mailbox.org","phobos.denx.de;\n spf=pass smtp.mailfrom=marek.vasut@mailbox.org","outgoing_mbo_mout;\n dkim=pass header.d=mailbox.org header.s=mail20150812 header.b=d1TwRccn;\n spf=pass (outgoing_mbo_mout: domain of marek.vasut@mailbox.org designates\n 2001:67c:2050:b231:465::1 as permitted sender)\n smtp.mailfrom=marek.vasut@mailbox.org"],"Received":["from phobos.denx.de (phobos.denx.de\n [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g03d23MWwz1yHB\n\tfor ; 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a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org;\n s=mail20150812; t=1776732496;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=CoaSZbsAXynu8zEj6gnCSvekj6dTOsFpf5FtAlIffBw=;\n b=SqGptAt18degHwQSTUkg3pmXFpyqhaZ2RYjjj6rBG0thwFqXlZIWtfhydE21PmP3CdQr1L\n LFly7E5IjwhP27MclwHFIcHqtGixQZhejBe8lxHgCLT6DTyPTZAcqNSa38yCaNtTLAqZnl\n 1p+EQ2cdgZaxEwbpeguHwhz6mxxeydszH7eA2M6RNSODZxSZyPF85aSNimmND6Kfg3CAvt\n R0qIEEugFcnxAHb9c0uRHhxtvv47mjZCWatsn+74CKyFOdI8sTCaWw03Pp8RuZzekdb7RK\n xPybCoOrQLrBuMZmW0di+xVp2yKDS+TO951UevtYt4Ho/fNYJg1LgZr4OBT8zg==","v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org;\n s=mail20150812; t=1776732495;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=CoaSZbsAXynu8zEj6gnCSvekj6dTOsFpf5FtAlIffBw=;\n b=d1TwRccnJfYdHDv0cK+3rzGYN9C2NN7IR0+XG4kp6/tWoGs7JSvppUvIUTYlt1X8jvC0hJ\n 9c7xB0VLSd1Wm799TFsgZRehkEmXg5yKr1Mb9asQzfCs3rR3kvL+Iafyl4DxRwPDDcwQVE\n PeMXmK+tTOnMwpBjx6piQV/f3m22+YBkHQPDGODH2fI3tSlpgd1cOF3tlJtsHT/2NBB/ER\n BHefMfUp7R5kughqU5AgrrEDapco8Z/7uRscQHEktYR9tZE6vOJ2jTG9k9CDtnWpoQeue+\n 9vEZxA/LuPM4mcIvqDQs0dLjXWsdK2viLgiHwfn02GFWUTEKj2XCOB7E1XXavA=="],"Message-ID":"<5aaaf387-f48b-4fe0-8461-7c3f05e27fe2@mailbox.org>","Date":"Tue, 21 Apr 2026 01:15:45 +0200","MIME-Version":"1.0","From":"Marek Vasut ","Subject":"Re: [PATCH] usb: gadget: renesas: add support for RZ/G2L SoC","To":"Michele Bisogno ","Cc":"u-boot@lists.denx.de, marek.vasut+renesas@mailbox.org, paul@pbarker.dev,\n jh80.chung@samsung.com, peng.fan@nxp.com, lukma@denx.de,\n mkorpershoek@kernel.org, trini@konsulko.com","References":"<20260415172113.273702-1-micbis.openwrt@gmail.com>\n \n ","Content-Language":"en-US","In-Reply-To":"\n ","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","X-MBO-RS-META":"p5zrhftjyna66xmuo7crfqyw1xmisbkj","X-MBO-RS-ID":"7627dceba75c288e024","X-Rspamd-Queue-Id":"4g03cc4FJtz9tpN","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}},{"id":3679858,"web_url":"http://patchwork.ozlabs.org/comment/3679858/","msgid":"","list_archive_url":null,"date":"2026-04-21T07:32:00","subject":"Re: [PATCH] usb: gadget: renesas: add support for RZ/G2L SoC","submitter":{"id":93164,"url":"http://patchwork.ozlabs.org/api/people/93164/","name":"Michele Bisogno","email":"micbis.openwrt@gmail.com"},"content":"Hi Marek,\n\nthank you for your comments and suggestions.\n\n> If Linux also contains the PIO code, it would also benefit from matching\n> improvement, right ?\n\nYes, though I have found the fix is not strictly required. We can maintain\nsynchronization between both repositories by utilizing the cfifo_byte_addr\nparameter for the RZ/G2L and similar devices, allowing us to leave the\nexisting PIO code untouched.\n\n> This should be a separate bugfix patch.\n\nAgreed.\n\n> Ideally, let's try to keep the Linux and U-Boot driver code base\n> synchronized as much as possible.\n\nUnderstood. I am currently preparing a revised patch set that aligns with\nthis approach to ensure consistency between the codebases.\n\nKind regards,\nMichele","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=pIfwGCN5;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.b=\"pIfwGCN5\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass smtp.mailfrom=micbis.openwrt@gmail.com"],"Received":["from phobos.denx.de (phobos.denx.de\n [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g0MMG1qlBz1yJG\n\tfor ; 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Tue, 21 Apr 2026\n 00:32:12 -0700 (PDT)","MIME-Version":"1.0","References":"<20260415172113.273702-1-micbis.openwrt@gmail.com>\n \n \n <5aaaf387-f48b-4fe0-8461-7c3f05e27fe2@mailbox.org>","In-Reply-To":"<5aaaf387-f48b-4fe0-8461-7c3f05e27fe2@mailbox.org>","From":"Michele Bisogno ","Date":"Tue, 21 Apr 2026 09:32:00 +0200","X-Gm-Features":"AQROBzDzu-qKb2bpuAcUpKRxiYiNbCFSjJx849CXj2DwUsBbhPq2RpHkn-wCFKc","Message-ID":"\n ","Subject":"Re: [PATCH] usb: gadget: renesas: add support for RZ/G2L SoC","To":"Marek Vasut ","Cc":"u-boot@lists.denx.de, marek.vasut+renesas@mailbox.org, paul@pbarker.dev,\n jh80.chung@samsung.com, peng.fan@nxp.com, lukma@denx.de,\n mkorpershoek@kernel.org, trini@konsulko.com","Content-Type":"text/plain; charset=\"UTF-8\"","X-Mailman-Approved-At":"Tue, 21 Apr 2026 14:37:42 +0200","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}},{"id":3680182,"web_url":"http://patchwork.ozlabs.org/comment/3680182/","msgid":"<41c9c73f-63ac-4ddf-98f4-d2762e94f0c8@mailbox.org>","list_archive_url":null,"date":"2026-04-22T01:16:15","subject":"Re: [PATCH] usb: gadget: renesas: add support for RZ/G2L SoC","submitter":{"id":85664,"url":"http://patchwork.ozlabs.org/api/people/85664/","name":"Marek Vasut","email":"marek.vasut@mailbox.org"},"content":"On 4/21/26 9:32 AM, Michele Bisogno wrote:\n\nHello Michele,\n\n> thank you for your comments and suggestions.\n> \n>> If Linux also contains the PIO code, it would also benefit from matching\n>> improvement, right ?\n> \n> Yes, though I have found the fix is not strictly required. We can maintain\n> synchronization between both repositories by utilizing the cfifo_byte_addr\n> parameter for the RZ/G2L and similar devices, allowing us to leave the\n> existing PIO code untouched.\n> \n>> This should be a separate bugfix patch.\n> \n> Agreed.\n> \n>> Ideally, let's try to keep the Linux and U-Boot driver code base\n>> synchronized as much as possible.\n> \n> Understood. I am currently preparing a revised patch set that aligns with\n> this approach to ensure consistency between the codebases.\nThank you !","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=mailbox.org header.i=@mailbox.org header.a=rsa-sha256\n header.s=mail20150812 header.b=KijCAcfk;\n\tdkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org\n header.a=rsa-sha256 header.s=mail20150812 header.b=H8dMfGJ9;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=85.214.62.61; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=reject dis=none) header.from=mailbox.org","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (2048-bit key;\n secure) header.d=mailbox.org header.i=@mailbox.org header.b=\"KijCAcfk\";\n\tdkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org\n header.b=\"H8dMfGJ9\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=reject dis=none) header.from=mailbox.org","phobos.denx.de;\n spf=pass smtp.mailfrom=marek.vasut@mailbox.org"],"Received":["from phobos.denx.de (phobos.denx.de [85.214.62.61])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g0hsW2258z1y2d\n\tfor ; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","X-MBO-RS-META":"gznszw7ardmk9mitxd59xxotdieyuu7w","X-MBO-RS-ID":"48db31876a797ca9372","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}}]