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 53B31C433F5 for ; Thu, 16 Dec 2021 09:44:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235516AbhLPJop (ORCPT ); Thu, 16 Dec 2021 04:44:45 -0500 Received: from mx07-00178001.pphosted.com ([185.132.182.106]:58250 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232987AbhLPJoo (ORCPT ); Thu, 16 Dec 2021 04:44:44 -0500 Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 1BG4BBpb032006; Thu, 16 Dec 2021 10:44:11 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=subject : to : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=selector1; bh=V5ZIMz/aPi5v3BQ3aLEg97h6IbRb7qKQ5CfjX76CSD4=; b=JJkMGEWzDvhRE/iYKtH31anMVtaBskikUfsRvGvQYkZkF8jA0+J5dbmdpTlZ87B/waUZ 69l88X7SzgdeJSgNubggT5CUO3aVBAfYa4ME4258in8/LvpTWgEVyPx5HXSN6Z2rQXyM X41T/ZSZZRcPfedR1I3OUxUBI01L38Wp0EsfBcm9BqL6AmFABsa4px+9IgIvqTCIJgWB O8GE3/QFdYYO5siLhYz/JDmazb+JDALVk3mJ4gNrO0wh/bcJLsg9hPJIRY70Bg+rNY4V 5zDJmubei7Le6VW9MOPUjl3VlY50CtXHWE/qi91cuo6nXFlm952Fj0YgfC1I1MUIKuM2 IA== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3cyfpxnm0j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 16 Dec 2021 10:44:11 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 7E3B210002A; Thu, 16 Dec 2021 10:44:10 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node2.st.com [10.75.127.5]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 741EB229A83; Thu, 16 Dec 2021 10:44:10 +0100 (CET) Received: from lmecxl0504.lme.st.com (10.75.127.45) by SFHDAG2NODE2.st.com (10.75.127.5) with Microsoft SMTP Server (TLS) id 15.0.1497.26; Thu, 16 Dec 2021 10:44:09 +0100 Subject: Re: [PATCH 4/4] mmc: mmci: add hs200 support for stm32 sdmmc To: Marek Vasut , Ulf Hansson , Russell King , Maxime Coquelin , Alexandre Torgue , Philipp Zabel , Linus Walleij , Vladimir Zapolskiy , , Christophe Kerello , Ludovic Barre , , , , References: <20211215141727.4901-1-yann.gautier@foss.st.com> <20211215141727.4901-5-yann.gautier@foss.st.com> From: Yann Gautier Message-ID: Date: Thu, 16 Dec 2021 10:44:09 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.75.127.45] X-ClientProxiedBy: SFHDAG1NODE3.st.com (10.75.127.3) To SFHDAG2NODE2.st.com (10.75.127.5) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-16_03,2021-12-14_01,2021-12-02_01 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/16/21 10:14 AM, Marek Vasut wrote: > On 12/15/21 15:17, Yann Gautier wrote: >> Use feedback clock for HS200 mode, as for SDR104. >> The HS200 mode can be enabled through DT by using mmc-hs200-1_8v. >> It is possible to use it on STM32MP13, but not STM32MP15 platforms. > > HS200 is possible even on the MP15, it just doesn't yield any > (performance) benefits due to the slower bus clock (125 MHz or so?), so > it isn't worth enabling it on MP15. It is nice to see MP13 can do better. Hi Marek, There is a limitation on MP15, please see errata sheet [1], chapter 2.3.19. HS200 (and SDR104) shouldn't be enabled on MP15. Best regards, Yann [1] https://www.st.com/resource/en/errata_sheet/dm00516256.pdf 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 709ACC433EF for ; Thu, 16 Dec 2021 09:46:09 +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-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Cc:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=FSylCfHbASV6OyvEqxIjCo0lsWutV+GPqoYLXKFYaak=; 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Thu, 16 Dec 2021 10:44:10 +0100 (CET) Received: from lmecxl0504.lme.st.com (10.75.127.45) by SFHDAG2NODE2.st.com (10.75.127.5) with Microsoft SMTP Server (TLS) id 15.0.1497.26; Thu, 16 Dec 2021 10:44:09 +0100 Subject: Re: [PATCH 4/4] mmc: mmci: add hs200 support for stm32 sdmmc To: Marek Vasut , Ulf Hansson , Russell King , Maxime Coquelin , Alexandre Torgue , Philipp Zabel , Linus Walleij , Vladimir Zapolskiy , , Christophe Kerello , Ludovic Barre , , , , References: <20211215141727.4901-1-yann.gautier@foss.st.com> <20211215141727.4901-5-yann.gautier@foss.st.com> From: Yann Gautier Message-ID: Date: Thu, 16 Dec 2021 10:44:09 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Originating-IP: [10.75.127.45] X-ClientProxiedBy: SFHDAG1NODE3.st.com (10.75.127.3) To SFHDAG2NODE2.st.com (10.75.127.5) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-16_03,2021-12-14_01,2021-12-02_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211216_014435_028838_58C636C9 X-CRM114-Status: GOOD ( 16.97 ) 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 12/16/21 10:14 AM, Marek Vasut wrote: > On 12/15/21 15:17, Yann Gautier wrote: >> Use feedback clock for HS200 mode, as for SDR104. >> The HS200 mode can be enabled through DT by using mmc-hs200-1_8v. >> It is possible to use it on STM32MP13, but not STM32MP15 platforms. > > HS200 is possible even on the MP15, it just doesn't yield any > (performance) benefits due to the slower bus clock (125 MHz or so?), so > it isn't worth enabling it on MP15. It is nice to see MP13 can do better. Hi Marek, There is a limitation on MP15, please see errata sheet [1], chapter 2.3.19. HS200 (and SDR104) shouldn't be enabled on MP15. Best regards, Yann [1] https://www.st.com/resource/en/errata_sheet/dm00516256.pdf _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel