From patchwork Mon Feb 20 08:02:22 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Zhong X-Patchwork-Id: 9582069 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 5898B6047C for ; Mon, 20 Feb 2017 08:03:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 48AF9287D2 for ; Mon, 20 Feb 2017 08:03:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3D8C528820; Mon, 20 Feb 2017 08:03:00 +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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BDAEF287D2 for ; Mon, 20 Feb 2017 08:02:59 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C474A6E36E; Mon, 20 Feb 2017 08:02:58 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-pf0-f196.google.com (mail-pf0-f196.google.com [209.85.192.196]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9E8C96E36E for ; Mon, 20 Feb 2017 08:02:57 +0000 (UTC) Received: by mail-pf0-f196.google.com with SMTP id o64so8552802pfb.1 for ; Mon, 20 Feb 2017 00:02:57 -0800 (PST) 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; bh=O2eb/NVQl2N4BfPpZaKgFjaKaFzNrD11xWbrVErevoU=; b=rZSSpxrIch7UIgUyrXsPhmwNZz3HmvW6QqKQtJOjptWm4nkH8EeUoHGWHc2zlAq24L AMUHlfsZJ1uI/JTYks7cFNo7YoKPL6tjFg7LuEgMQXb7wkUg2LwZr9Pigj5Kwr8aL0bN vOKJmeVC2vR3cZp43iUkERTH5DJ91XwlZMkBIiNGpQr7gO5ws0GpXX+bY6/lWhCejmF9 WxefmEOGl3tzsdWZWuYBlSwiTldVpmsw4JjDQyyQ0KiLalb2xYUnORRGkjem4yb48tsG Ec2c7nkpKunjvtNtiGUOyDqHJy8jCBH8poxKQIn/5YZlIgVR5RMuVmQMUIZN/NYX+mr6 H35A== X-Gm-Message-State: AMke39lC+uzKQicIdidtdjSzN6DitWE5+6Ee4wLHeuLkSIS85IWUuMFPXIbl740UA7dMrQ== X-Received: by 10.84.197.69 with SMTP id m63mr30296011pld.19.1487577777284; Mon, 20 Feb 2017 00:02:57 -0800 (PST) Received: from localhost.localdomain ([103.29.142.67]) by smtp.gmail.com with ESMTPSA id j127sm9998784pfg.89.2017.02.20.00.02.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 20 Feb 2017 00:02:56 -0800 (PST) From: Chris Zhong To: john@metanate.com, dianders@chromium.org, tfiga@chromium.org, heiko@sntech.de, yzq@rock-chips.com, mark.rutland@arm.com, devicetree@vger.kernel.org, robh+dt@kernel.org, galak@codeaurora.org, pawel.moll@arm.com, seanpaul@chromium.org Subject: [RESEND PATCH v7 6/7] drm/rockchip/dsi: fix insufficient bandwidth of some panel Date: Mon, 20 Feb 2017 16:02:22 +0800 Message-Id: <1487577744-2855-7-git-send-email-zyw@rock-chips.com> X-Mailer: git-send-email 2.6.3 In-Reply-To: <1487577744-2855-1-git-send-email-zyw@rock-chips.com> References: <1487577744-2855-1-git-send-email-zyw@rock-chips.com> Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, Chris Zhong , linux-arm-kernel@lists.infradead.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 Reviewed-by: Sean Paul --- Changes in v6: None Changes in v5: None Changes in v4: None Changes in v3: None 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 c2d7674..a653384 100644 --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c @@ -532,8 +532,8 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi, mpclk = DIV_ROUND_UP(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