From patchwork Mon Sep 2 12:53:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 11126621 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9C49514E5 for ; Mon, 2 Sep 2019 12:54:46 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 847522168B for ; Mon, 2 Sep 2019 12:54:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 847522168B Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=ti.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 64B7F8907B; Mon, 2 Sep 2019 12:54:45 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from lelv0143.ext.ti.com (lelv0143.ext.ti.com [198.47.23.248]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1AC978907B for ; Mon, 2 Sep 2019 12:54:44 +0000 (UTC) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id x82CseRS021109; Mon, 2 Sep 2019 07:54:41 -0500 Received: from DFLE114.ent.ti.com (dfle114.ent.ti.com [10.64.6.35]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x82Csefc000693 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 2 Sep 2019 07:54:40 -0500 Received: from DFLE113.ent.ti.com (10.64.6.34) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Mon, 2 Sep 2019 07:54:40 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Mon, 2 Sep 2019 07:54:40 -0500 Received: from deskari.lan (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id x82CsYYK126767; Mon, 2 Sep 2019 07:54:38 -0500 From: Tomi Valkeinen To: , Laurent Pinchart Subject: [PATCH 2/7] drm/omap: tweak HDMI DDC timings Date: Mon, 2 Sep 2019 15:53:54 +0300 Message-ID: <20190902125359.18001-3-tomi.valkeinen@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190902125359.18001-1-tomi.valkeinen@ti.com> References: <20190902125359.18001-1-tomi.valkeinen@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1567428881; bh=mYX3M9lARZ7RahIZ6yhHUt6HTWrhvGOs4KiLMgz+DEY=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=PhDzanepuBPuaApuXUUyKKrUSTvXqdWhPNOkFwIG7ghF0IsKLaOS9NZs5XZKrFmi5 bdc00H1bmEf/BVOz8HwqgB2dyrkyQwo91SuHsZS4CChioYJa9pQDVRaaBEOZO+Dnp2 388WD6tsWlK4EUgMR4mcM2B6xGeOo3SKM+VGhT6E= X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alejandro Hernandez , Tomi Valkeinen , Jyri Sarha Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Alejandro Hernandez A "HDMI I2C Master Error" is sometimes reported with the current DDC SCL timings. The current settings for a 10us SCL period (100 KHz) causes the error with some displays. This patch increases the SCL signal period from 10us to 10.2us, with the new settings the error is not observed Signed-off-by: Alejandro Hernandez Signed-off-by: Tomi Valkeinen Acked-by: Laurent Pinchart --- drivers/gpu/drm/omapdrm/dss/hdmi5_core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c b/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c index 7400fb99d453..4c588ec7634a 100644 --- a/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c +++ b/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c @@ -39,8 +39,8 @@ static void hdmi_core_ddc_init(struct hdmi_core_data *core) { void __iomem *base = core->base; const unsigned long long iclk = 266000000; /* DSS L3 ICLK */ - const unsigned int ss_scl_high = 4600; /* ns */ - const unsigned int ss_scl_low = 5400; /* ns */ + const unsigned int ss_scl_high = 4700; /* ns */ + const unsigned int ss_scl_low = 5500; /* ns */ const unsigned int fs_scl_high = 600; /* ns */ const unsigned int fs_scl_low = 1300; /* ns */ const unsigned int sda_hold = 1000; /* ns */