From patchwork Fri Jul 8 09:05:01 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Zhong X-Patchwork-Id: 9220231 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2448F6044F for ; Fri, 8 Jul 2016 09:08:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 127DD285F9 for ; Fri, 8 Jul 2016 09:08:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 06FBB2860D; Fri, 8 Jul 2016 09:08:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C1CE0285F9 for ; Fri, 8 Jul 2016 09:08:11 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bLRkQ-0001Jm-I5; Fri, 08 Jul 2016 09:06:58 +0000 Received: from mail-pf0-f196.google.com ([209.85.192.196]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bLRjS-0000BX-GM; Fri, 08 Jul 2016 09:06:05 +0000 Received: by mail-pf0-f196.google.com with SMTP id 66so5439845pfy.1; Fri, 08 Jul 2016 02:05:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=AZ4M90jY1oTiCSrkggfMh4rKkqX256E0jKAz0BqH/LA=; b=B7X3ZODVAneK3nyZdaS2rqAapnJLjh0LROI0S26LLVBFEznbkgd+Ya1VoTJxzN+koU T+hE6ltCVEesa10FCMrfRn6S7kRNCB5J6/MZg/0Z8idZHSYqwKV2fnkacbunw0InkyTS djWBWBmoMheH/glUcZVScFoUBzVC3sIQJLqPzTuR59HwLQYyxjAATe8yNLvu9xMAxXID TUsF1gCKPVt4HcZFP00g8DeF7mpXMnJFD5gISTuVgAmwDuW13ApUQyqGgFRfdVdCn2dh vQeBG4kH45ZUnqxeETYUtBnPxc9fE9E6o6ocUQF4SX9KE7SelMT0/MFeOHcq4+2wZJrT teoA== X-Gm-Message-State: ALyK8tKMcbouGKnEaP1I0Pi9rTsUXl/uFvZP0DsvNZUm4MrgRIl3gq9oOnERRZFKSezhXQ== X-Received: by 10.98.95.5 with SMTP id t5mr8016852pfb.103.1467968740468; Fri, 08 Jul 2016 02:05:40 -0700 (PDT) Received: from localhost.localdomain ([103.29.142.67]) by smtp.gmail.com with ESMTPSA id by5sm3289881pad.36.2016.07.08.02.05.36 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 08 Jul 2016 02:05:39 -0700 (PDT) From: Chris Zhong To: dianders@chromium.org, tfiga@chromium.org, heiko@sntech.de, yzq@rock-chips.com Subject: [PATCH 7/7] drm/rockchip: dw-mipi: fix insufficient bandwidth of some panel Date: Fri, 8 Jul 2016 17:05:01 +0800 Message-Id: <1467968701-15620-8-git-send-email-zyw@rock-chips.com> X-Mailer: git-send-email 2.6.3 In-Reply-To: <1467968701-15620-1-git-send-email-zyw@rock-chips.com> References: <1467968701-15620-1-git-send-email-zyw@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160708_020558_901488_0DB38AC1 X-CRM114-Status: GOOD ( 10.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, Chris Zhong , linux-arm-kernel@lists.infradead.org, Mark Yao MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Set the lanes bps to 1 / 0.9 times of pclk, the margin is not enough for some panel, it will cause the screen display is not normal, so increases the badnwidth to 1 / 0.8. Signed-off-by: Chris Zhong --- drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c index 8401185..fca7dde 100644 --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c @@ -503,8 +503,8 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi) mpclk = DIV_ROUND_UP(dsi->mode->clock, MSEC_PER_SEC); if (mpclk) { - /* take 1 / 0.9, since mbps must big than bandwidth of RGB */ - tmp = mpclk * (bpp / dsi->lanes) * 10 / 9; + /* take 1 / 0.8, since mbps must big than bandwidth of RGB */ + tmp = mpclk * (bpp / dsi->lanes) * 10 / 8; if (tmp < max_mbps) target_mbps = tmp; else