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 5C49CC001DC for ; Sun, 30 Jul 2023 16:31:51 +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:In-Reply-To:MIME-Version:References: Message-ID:Subject:CC:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=KBzKe4uKiRC+zXSXmV/Hjrbi0yUDcapcfOcelFA4OPk=; b=yCWcaHZsheiPZO 8Sbt4ovb+S1g9tNDuy7yStFtdo37FU5d2PraE1gzZEI1cQN0MOev9cwfcPmy7pw0FYsVp8zgYoMqb ITb34qIU/OniWdhvm/uynyQc59R/9woblv5dmRpxlICVocnnSo/Vpf/ycWIFwRQj2y9y3AT8dfY/S +vy90WStBRhfvNENB9DBpGyoloTtq2uCi+Yj5o+gokDtW/KigBFIZNYJ825yEUGaISH8norJ6gmlx TvNDJrSEr/R4PFGrK2gbg0YsbAomMEae2f9IFtlxYu9BWQOSoDeApEBMNG3g+DKD4aOILfIdql9sq tCJp9laUsZMO01lACS2w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qQ9KF-00C58v-09; Sun, 30 Jul 2023 16:31:23 +0000 Received: from lelv0142.ext.ti.com ([198.47.23.249]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qQ9KC-00C57i-2R for linux-arm-kernel@lists.infradead.org; Sun, 30 Jul 2023 16:31:22 +0000 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 36UGUrpZ100932; Sun, 30 Jul 2023 11:30:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1690734653; bh=XKtNxckA/XWO2NAsROeQTCyFJZHbB19LMoO2JprXf3g=; h=Date:From:To:CC:Subject:References:In-Reply-To; b=UgtXhNlxbg37JbuX4E7Wfa5GZcg44techGXloHYcx1wW8eICj2Vt3aucZROKr7rUB YJPd5ulMgI4jvL4HZmSsWuQk44G4tWOT4nXxWBDmK2nGRy5hgDLs3FblsM1r67KNJ4 mBqcXjOqI9BGIa5TZvSX5Ec/Yy89SfNf2oQsbiEI= Received: from DLEE100.ent.ti.com (dlee100.ent.ti.com [157.170.170.30]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 36UGUro2114094 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Sun, 30 Jul 2023 11:30:53 -0500 Received: from DLEE100.ent.ti.com (157.170.170.30) by DLEE100.ent.ti.com (157.170.170.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Sun, 30 Jul 2023 11:30:52 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE100.ent.ti.com (157.170.170.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Sun, 30 Jul 2023 11:30:52 -0500 Received: from localhost (ileaxei01-snat.itg.ti.com [10.180.69.5]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 36UGUqla002529; Sun, 30 Jul 2023 11:30:52 -0500 Date: Sun, 30 Jul 2023 11:30:52 -0500 From: Nishanth Menon To: Aradhya Bhatia CC: Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Catalin Marinas , Conor Dooley , Devicetree List , Linux Kernel List , Linux ARM Kernel List , Tomi Valkeinen , Rahul T R , Devarsh Thakkar , Jai Luthra , Jayesh Choudhary Subject: Re: [PATCH v3 1/8] arm64: dts: ti: k3-am62x-sk-common: Update main-i2c1 frequency Message-ID: <20230730163052.w5y5a25xgpxzuhzs@serving> References: <20230728173438.12995-1-a-bhatia1@ti.com> <20230728173438.12995-2-a-bhatia1@ti.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230728173438.12995-2-a-bhatia1@ti.com> X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230730_093120_987180_99E5EE72 X-CRM114-Status: GOOD ( 21.49 ) 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-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 23:04-20230728, Aradhya Bhatia wrote: > The Display Data Channel (DDC) transactions between an HDMI transmitter > (SIL9022A in this case) and an HDMI monitor, occur at a maximum of > 100KHz. That's the maximum supported frequency within DDC standards. > > While the SIL9022A can transact with the core at 400KHz, it needs to > drop the frequency to 100KHz when communicating with the monitor, > otherwise, the i2c controller times out and shows warning like this. > > [ 985.773431] omap_i2c 20010000.i2c: controller timed out > > That feature, however, has not been enabled in the SIL9022 driver. > > Since, dropping the frequency doesn't affect any other devices on the > bus, drop the main-i2c1 frequency from 400KHz to 100KHz. > > Signed-off-by: Aradhya Bhatia > --- > arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi > index 34c8ffc553ec..540ed8a0d7fb 100644 > --- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi > +++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi > @@ -300,7 +300,7 @@ &main_i2c1 { > status = "okay"; > pinctrl-names = "default"; > pinctrl-0 = <&main_i2c1_pins_default>; > - clock-frequency = <400000>; > + clock-frequency = <100000>; > > tlv320aic3106: audio-codec@1b { > #sound-dai-cells = <0>; > -- > 2.40.1 > I know we had issues with level shifters on the dev platform previously, but do we need this patch anymore with the production boards? if so, use Fixes and I can pick for next. -- Regards, Nishanth Menon Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel