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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,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 3F9E6C4360F for ; Thu, 14 Feb 2019 19:26:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0FC52222DA for ; Thu, 14 Feb 2019 19:26:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amarulasolutions.com header.i=@amarulasolutions.com header.b="Vyk+rJ8H" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2438434AbfBNT0T (ORCPT ); Thu, 14 Feb 2019 14:26:19 -0500 Received: from mail-pf1-f195.google.com ([209.85.210.195]:43598 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438384AbfBNT0Q (ORCPT ); Thu, 14 Feb 2019 14:26:16 -0500 Received: by mail-pf1-f195.google.com with SMTP id q17so3570681pfh.10 for ; Thu, 14 Feb 2019 11:26:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amarulasolutions.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=pAS7zvIWI8WLdUvyOqbvv5PR0m69rmeaJXwVeXQOXIs=; b=Vyk+rJ8HvVAw95K6i0er3o3GNantkwwsjUiLABTAEq6sF0u+4mSOsSfAZ/oI4R7WgP /iJ5gbUmN04+hyYNrPzcHSe32um4i+w4XAccxMIUx/wGn+D5SC7j62hQfUdX4aE6ADDS ZM9FaE3AAv09SKXRnMRi9uQZsv/g5QHruIiO8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=pAS7zvIWI8WLdUvyOqbvv5PR0m69rmeaJXwVeXQOXIs=; b=hIkLpDH1/6+yPCpJRWzE9uQ51T4kedLq6OosKUusA9x1dCT6ZGMdAAvOtWlNJMq+JL BJGoOmZ7AO70m+89Fdogif7v4JSp4b8y9OiCXcqg9TovoTLDU6yFXscfmf52xP7ZyqZE VwIUV8YXq9qX0eWl/rmommM/Iy7yMGY9LkszT9E/jvZPGq95b6kQHH8gJSEsQmlWvh+K N5AHrlF2lMY8PZAXvRF9oqjcd5tP46nT9ECNPO/ZMODGEsgVAKY0Lu2EeWGY86O3U062 mA/ylJvoiLXOORbpqCNbqyVc5LtI2JuHVSr6JlZc2WEEP92URcY6GDTcewVQLwXqKnCm 4nHA== X-Gm-Message-State: AHQUAuYsgudgmDQfBx5uvcy35i8BsCouUv+Z+cpmPHQOp0nuR2b0/lNA CdaHpznFdbzDQNq5qXkM/bS87Q== X-Google-Smtp-Source: AHgI3IZW3Ke01qP/UcsGyJ+t0jFHnf1csxubvY1+0IvrmamyU3fpmC2bQHR9lusbB5SS1SjeFuh2FQ== X-Received: by 2002:a63:7402:: with SMTP id p2mr1397042pgc.360.1550172375719; Thu, 14 Feb 2019 11:26:15 -0800 (PST) Received: from localhost.localdomain ([115.97.184.151]) by smtp.gmail.com with ESMTPSA id k71sm8390100pga.44.2019.02.14.11.26.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Feb 2019 11:26:15 -0800 (PST) From: Jagan Teki To: Maxime Ripard , David Airlie , Daniel Vetter , Chen-Yu Tsai Cc: dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-amarula@amarulasolutions.com, Michael Trimarchi , Jagan Teki Subject: [PATCH v8 3/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hfp timing value Date: Fri, 15 Feb 2019 00:55:39 +0530 Message-Id: <20190214192544.7314-4-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.18.0.321.gffc6fa0e3 In-Reply-To: <20190214192544.7314-1-jagan@amarulasolutions.com> References: <20190214192544.7314-1-jagan@amarulasolutions.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Current driver is calculating hfp maximum value by subtracting htotal with hsync_end which is back porch value, but the hfp refers to front porch. Front porch value is calculating by subtracting hsync_start with hdisplay as per drm_mode timings, and BSP code from BPI-M64-bsp is eventually following the same. BPI-M64-bsp is computing hfp as (from linux-sunxi/ drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c) dsi_hbp = (hbp-hspw)*dsi_pixel_bits[format]/8 - (4+2); dsi_hact = x * dsi_pixel_bits[format]/8; dsi_hblk = (ht-hspw)*dsi_pixel_bits[format]/8-(4+4+2); dsi_hfp = dsi_hblk - (4+dsi_hact+2) - (4+dsi_hbp+2); Example, u32 fmt = dsi_pixel_bits[format]/8; => ((ht-hspw)*fmt - 10) - (6 + x * fmt) - (6 + (hbp-hspw)*fmt - 6) => (ht - hspw - x - (hbp - hspw)) * fmt - 16 => (ht - x - hbp) * fmt - 16 => (ht - x - (timmings->hor_total_time - timmings->hor_front_porch - x) * fmt - 16 => (timmings->hor_total_time - x - timmings->hor_total_time + timmings->hor_front_porch + x) * fmt - 16 => timmings->hor_front_porch * fmt - 16 So, update the hfp value accordingly in sun6i_dsi_setup_timings. Tested on 2-lane, 4-lane MIPI-DSI LCD panels. Signed-off-by: Jagan Teki Tested-by: Merlijn Wajer --- drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 982ae6b17654..21f39f11a8de 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -480,7 +480,8 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi, */ #define HFP_PACKET_OVERHEAD 6 hfp = max((unsigned int)HFP_PACKET_OVERHEAD, - (mode->htotal - mode->hsync_end) * Bpp - HFP_PACKET_OVERHEAD); + (mode->hsync_start - mode->hdisplay) * Bpp - + HFP_PACKET_OVERHEAD); /* * hblk seems to be the line + porches length. -- 2.18.0.321.gffc6fa0e3