From patchwork Mon Nov 15 17:02:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 12692645 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2DBA3C433F5 for ; Mon, 15 Nov 2021 17:46:50 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id EB53C633B7 for ; Mon, 15 Nov 2021 17:46:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org EB53C633B7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org 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:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=OnDH1i61pCSA+wOQ6hP8SXgnZhEGWTXY+azEVWI2aNA=; b=IOMzJrtQ37r98d mf7W/ukbYRIiBDawNeVuiRQPq53aZ9bLN4mY1l5BCTSEA/G/97iCeR8TNULSvqKToljg+RCksHXpi XJ+5T3OQ4Uuh9qsTjKMTWN/72BySjnGbZLxZbREnKdBzej03Oj5s0M4Fv4k2k7x5AfcIl9nkGuuv9 zBukKYArcx5wIMl+ZG53lhNFSM+v10GyqRbcYuM4qZctnQmLUGmeGkCy07jKHArl5+4hyOjZhL7fZ 2r7Db+Xd/XhZl+5GpM61rwtrn4gkHOWbAIeHtYH5cbV4uA503WMdujj8wsS3Vr70aO4PY7byffD7y tCASyzb3nXLaxmgWM8JA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mmg2p-00GaGD-Ei; Mon, 15 Nov 2021 17:45:27 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mmg2l-00GaFK-AY for linux-arm-kernel@lists.infradead.org; Mon, 15 Nov 2021 17:45:24 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 74DF4633A5; Mon, 15 Nov 2021 17:45:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636998323; bh=rLY4Mke7S36U1O4oppZxQHTcYaUOjDpT7lsAxWlWmoA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=i7tNAxdIY4dfVm/M0BDiQu0AC0d4WoltfD5+Myi0imYB+kI2VOcGG0aqIu/iOR59J KsH3AdxKBem3S0JwKdYPlwzrunG7s4jxaoUiZhCRoFmkTkq+plpnxvAOSOxNiOWywL XVfnsjt7qbcv2zE5TVffaJZgNqu5Fl1Bg+nxtiGE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marek Vasut , Alexandre Torgue , Patrice Chotard , Patrick Delaunay , linux-stm32@st-md-mailman.stormreply.com, Sasha Levin Subject: [PATCH 5.10 435/575] ARM: dts: stm32: Reduce DHCOR SPI NOR frequency to 50 MHz Date: Mon, 15 Nov 2021 18:02:40 +0100 Message-Id: <20211115165358.816966209@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165343.579890274@linuxfoundation.org> References: <20211115165343.579890274@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211115_094523_412628_4A631F27 X-CRM114-Status: GOOD ( 14.00 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Marek Vasut [ Upstream commit 2012579b31293d0a8cf2024e9dab66810bf1a15e ] The SPI NOR is a bit further away from the SoC on DHCOR than on DHCOM, which causes additional signal delay. At 108 MHz, this delay triggers a sporadic issue where the first bit of RX data is not received by the QSPI controller. There are two options of addressing this problem, either by using the DLYB block to compensate the extra delay, or by reducing the QSPI bus clock frequency. The former requires calibration and that is overly complex, so opt for the second option. Fixes: 76045bc457104 ("ARM: dts: stm32: Add QSPI NOR on AV96") Signed-off-by: Marek Vasut Cc: Alexandre Torgue Cc: Patrice Chotard Cc: Patrick Delaunay Cc: linux-stm32@st-md-mailman.stormreply.com To: linux-arm-kernel@lists.infradead.org Signed-off-by: Alexandre Torgue Signed-off-by: Sasha Levin --- arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi index a9eb82b2f1704..5af32140e128b 100644 --- a/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi +++ b/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi @@ -198,7 +198,7 @@ compatible = "jedec,spi-nor"; reg = <0>; spi-rx-bus-width = <4>; - spi-max-frequency = <108000000>; + spi-max-frequency = <50000000>; #address-cells = <1>; #size-cells = <1>; };