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 X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A5F1C433E2 for ; Thu, 14 May 2020 14:36:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C03E205CB for ; Thu, 14 May 2020 14:36:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727928AbgENOgh (ORCPT ); Thu, 14 May 2020 10:36:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726146AbgENOgh (ORCPT ); Thu, 14 May 2020 10:36:37 -0400 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2700C061A0C for ; Thu, 14 May 2020 07:36:37 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: rcn) with ESMTPSA id DE0952A2EE9 From: =?UTF-8?q?Ricardo=20Ca=C3=B1uelo?= To: Laurent.pinchart@ideasonboard.com Cc: kernel@collabora.com, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, jason@lakedaemon.net, tomi.valkeinen@ti.com, robh+dt@kernel.org, airlied@linux.ie, shawnguo@kernel.org Subject: [PATCH v2 4/4] drm/bridge: tfp410: Fix setup and hold time calculation Date: Thu, 14 May 2020 16:36:12 +0200 Message-Id: <20200514143612.2094-5-ricardo.canuelo@collabora.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20200514143612.2094-1-ricardo.canuelo@collabora.com> References: <20200514143612.2094-1-ricardo.canuelo@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The tfp410 has a data de-skew feature that allows the user to compensate the skew between IDCK and the pixel data and control signals. In the driver, the setup and hold times are calculated from the de-skew value. This retrieves the deskew value from the DT using the proper datatype and range check as described by the binding (u32 from 0 to 7) and fixes the calculation of the setup and hold times. Signed-off-by: Ricardo Cañuelo --- drivers/gpu/drm/bridge/ti-tfp410.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c index e3eb6364c0f7..21d99b4ea0c9 100644 --- a/drivers/gpu/drm/bridge/ti-tfp410.c +++ b/drivers/gpu/drm/bridge/ti-tfp410.c @@ -220,7 +220,7 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c) struct device_node *ep; u32 pclk_sample = 0; u32 bus_width = 24; - s32 deskew = 0; + u32 deskew = 0; /* Start with defaults. */ *timings = tfp410_default_timings; @@ -274,12 +274,12 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c) } /* Get the setup and hold time from vendor-specific properties. */ - of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew); - if (deskew < -4 || deskew > 3) + of_property_read_u32(dvi->dev->of_node, "ti,deskew", &deskew); + if (deskew > 7) return -EINVAL; - timings->setup_time_ps = min(0, 1200 - 350 * deskew); - timings->hold_time_ps = min(0, 1300 + 350 * deskew); + timings->setup_time_ps = 1200 - 350 * ((s32)deskew - 4); + timings->hold_time_ps = max(0, 1300 + 350 * ((s32)deskew - 4)); return 0; } -- 2.18.0 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 X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9DC74C433DF for ; Thu, 14 May 2020 14:38:14 +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 687B72070A for ; 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Thu, 14 May 2020 14:36:44 +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 88600205CB for ; Thu, 14 May 2020 14:36:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 88600205CB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.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 169306EB57; Thu, 14 May 2020 14:36:40 +0000 (UTC) Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by gabe.freedesktop.org (Postfix) with ESMTPS id ABAE76EB54 for ; Thu, 14 May 2020 14:36:37 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: rcn) with ESMTPSA id DE0952A2EE9 From: =?UTF-8?q?Ricardo=20Ca=C3=B1uelo?= To: Laurent.pinchart@ideasonboard.com Subject: [PATCH v2 4/4] drm/bridge: tfp410: Fix setup and hold time calculation Date: Thu, 14 May 2020 16:36:12 +0200 Message-Id: <20200514143612.2094-5-ricardo.canuelo@collabora.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20200514143612.2094-1-ricardo.canuelo@collabora.com> References: <20200514143612.2094-1-ricardo.canuelo@collabora.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, jason@lakedaemon.net, airlied@linux.ie, dri-devel@lists.freedesktop.org, robh+dt@kernel.org, tomi.valkeinen@ti.com, kernel@collabora.com, shawnguo@kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; 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