From patchwork Fri Jul 28 17:34:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aradhya Bhatia X-Patchwork-Id: 707646 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 848C2C001DE for ; Fri, 28 Jul 2023 17:35:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232744AbjG1RfB (ORCPT ); Fri, 28 Jul 2023 13:35:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59736 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229459AbjG1RfA (ORCPT ); Fri, 28 Jul 2023 13:35:00 -0400 Received: from lelv0142.ext.ti.com (lelv0142.ext.ti.com [198.47.23.249]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 04F052D7E; Fri, 28 Jul 2023 10:34:57 -0700 (PDT) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 36SHYfDv124814; Fri, 28 Jul 2023 12:34:41 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1690565681; bh=MOLHCWreKJ2rhA1byXhX1C2yjsQpFL8ke8qzPBhzQ3E=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=SXdUjPaz8L4EqpxcTl+3AdjhfVHt2xdAPqzBnyEJglgNSaicEYmpcwtPxktGmsM2r zEQQbm1ObYAdKBxdkD3RiJPfVRopVRNCwr4X4nb7DAHI/ibb2U2Vf2tKV3CLdErTVF Obw9KjoQzxTkhJJSnVaQCtBcfQuIGF36EUiq+tPw= Received: from DFLE105.ent.ti.com (dfle105.ent.ti.com [10.64.6.26]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 36SHYf0N020852 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 28 Jul 2023 12:34:41 -0500 Received: from DFLE103.ent.ti.com (10.64.6.24) by DFLE105.ent.ti.com (10.64.6.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Fri, 28 Jul 2023 12:34:41 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE103.ent.ti.com (10.64.6.24) 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; Fri, 28 Jul 2023 12:34:41 -0500 Received: from localhost (ileaxei01-snat.itg.ti.com [10.180.69.5]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 36SHYe4F003975; Fri, 28 Jul 2023 12:34:41 -0500 From: Aradhya Bhatia To: Nishanth Menon , Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Catalin Marinas , Conor Dooley CC: Devicetree List , Linux Kernel List , Linux ARM Kernel List , Tomi Valkeinen , Rahul T R , Devarsh Thakkar , Jai Luthra , Jayesh Choudhary , Aradhya Bhatia Subject: [PATCH v3 1/8] arm64: dts: ti: k3-am62x-sk-common: Update main-i2c1 frequency Date: Fri, 28 Jul 2023 23:04:31 +0530 Message-ID: <20230728173438.12995-2-a-bhatia1@ti.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230728173438.12995-1-a-bhatia1@ti.com> References: <20230728173438.12995-1-a-bhatia1@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 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>;