From patchwork Mon Mar 16 13:35:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Icenowy Zheng X-Patchwork-Id: 11443001 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 1319D14B4 for ; Tue, 17 Mar 2020 14:16:53 +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 E541920663 for ; Tue, 17 Mar 2020 14:16:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=aosc.io header.i=@aosc.io header.b="quP9cKqY" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E541920663 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=aosc.io 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 6B51E89FBC; Tue, 17 Mar 2020 14:16:41 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from dodo.xh.is (dodo.xh.is [IPv6:2001:19f0:8001:184d:5400:2ff:fe7b:e8bd]) by gabe.freedesktop.org (Postfix) with ESMTPS id 45DA389DA6 for ; Mon, 16 Mar 2020 13:37:57 +0000 (UTC) X-Spam: yes X-Spam-Score: 6.6 / 99999 X-Spam-Symbols: TO_DN_SOME, FREEMAIL_ENVRCPT, TO_MATCH_ENVRCPT_SOME, MID_CONTAINS_FROM, RCVD_NO_TLS_LAST, RCVD_COUNT_TWO, SUSPICIOUS_RECIPS, FROM_EQ_ENVFROM, ASN, R_MISSING_CHARSET, TAGGED_RCPT, RCPT_COUNT_TWELVE, FREEMAIL_TO, ARC_NA, RCVD_VIA_SMTP_AUTH, FROM_HAS_DN, BROKEN_CONTENT_TYPE, MIME_TRACE Received: by dodo.xh.is (OpenSMTPD) with ESMTPSA id d83d4fb8 (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256:NO); Mon, 16 Mar 2020 06:37:56 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) (Authenticated sender: icenowy@aosc.io) by hermes.aosc.io (Postfix) with ESMTPSA id 904224CA5E; Mon, 16 Mar 2020 13:37:47 +0000 (UTC) From: Icenowy Zheng To: Thierry Reding , Sam Ravnborg , Rob Herring , Maxime Ripard , Chen-Yu Tsai , Ondrej Jirman Subject: [PATCH v2 4/5] drm/sun4i: sun6i_mipi_dsi: fix horizontal timing calculation Date: Mon, 16 Mar 2020 21:35:02 +0800 Message-Id: <20200316133503.144650-5-icenowy@aosc.io> In-Reply-To: <20200316133503.144650-1-icenowy@aosc.io> References: <20200316133503.144650-1-icenowy@aosc.io> MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aosc.io; s=dkim; t=1584365875; h=from:subject:date:message-id:to:cc:mime-version:content-transfer-encoding:in-reply-to:references; bh=I9YOqCvznKIa+lsR+6QqRxbL27UJzO8C40dZ4CFdKfA=; b=quP9cKqYYDD232RMGPzPh7YZaHSfncJHKNCNVORZvb7EzFJyswyLBv7GzoCIM/6KvGiH5Z xbpDQs4fRsR5P/Cp7hTcnx+MoFGO3XV0SD6R82gTqKwejhi4j3ozUQiiIMTMC0P2NzAMb0 tDkRk8CMwU/bfv3YHZlXvgGaYrZkMd8= X-Mailman-Approved-At: Tue, 17 Mar 2020 14:16:40 +0000 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, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-sunxi@googlegroups.com, linux-arm-kernel@lists.infradead.org, Icenowy Zheng Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The max() function call in horizontal timing calculation shouldn't pad a length already subtracted with overhead to overhead, instead it should only prevent the set timing to underflow. Signed-off-by: Icenowy Zheng --- No changes in v2. drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 059939789730..5f2313c40328 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -555,7 +555,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi, */ #define HSA_PACKET_OVERHEAD 10 hsa = max((unsigned int)HSA_PACKET_OVERHEAD, - (mode->hsync_end - mode->hsync_start) * Bpp - HSA_PACKET_OVERHEAD); + (mode->hsync_end - mode->hsync_start) * Bpp) - HSA_PACKET_OVERHEAD; /* * The backporch is set using a blanking packet (4 @@ -564,7 +564,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi, */ #define HBP_PACKET_OVERHEAD 6 hbp = max((unsigned int)HBP_PACKET_OVERHEAD, - (mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD); + (mode->htotal - mode->hsync_end) * Bpp) - HBP_PACKET_OVERHEAD; /* * The frontporch is set using a sync event (4 bytes) @@ -574,7 +574,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi, */ #define HFP_PACKET_OVERHEAD 16 hfp = max((unsigned int)HFP_PACKET_OVERHEAD, - (mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD); + (mode->hsync_start - mode->hdisplay) * Bpp) - HFP_PACKET_OVERHEAD; /* * The blanking is set using a sync event (4 bytes) @@ -583,8 +583,8 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi, */ #define HBLK_PACKET_OVERHEAD 10 hblk = max((unsigned int)HBLK_PACKET_OVERHEAD, - (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp - - HBLK_PACKET_OVERHEAD); + (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp) - + HBLK_PACKET_OVERHEAD; /* * And I'm not entirely sure what vblk is about. The driver in