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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,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 BC215C43381 for ; Mon, 18 Feb 2019 13:46:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8A3AA217F5 for ; Mon, 18 Feb 2019 13:46:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550497594; bh=3Rp3UfnMSf9TPj0p0X4vGCJSHFOUMx/nzpo+PRdgel4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=EtruZwFFI09ncZEMiXEoMnsXQhKJd8YSHt+DXWqRtKfpsK4kWQLCWwbFW2AfDZNcd EEZiVhVgH2YixbCGdI4cZJD7oJkLEBcL3u/9X64ceLpsDOTpFvWwoSg4sD/CEyZnMN aGmPGwgL5bCot7Tig7k1H0oH469LFkY7tGj/r/fA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731653AbfBRNqd (ORCPT ); Mon, 18 Feb 2019 08:46:33 -0500 Received: from mail.kernel.org ([198.145.29.99]:52938 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730512AbfBRNqb (ORCPT ); Mon, 18 Feb 2019 08:46:31 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2C384217F5; Mon, 18 Feb 2019 13:46:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550497589; bh=3Rp3UfnMSf9TPj0p0X4vGCJSHFOUMx/nzpo+PRdgel4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Jzir9p3Eey7Bi4nUQ2zqI+FKK+vqM7WKombRRh/V4Lt4vh1adGRLyjM974WqcEPrH nag09+xFaInUhE6SuAUzXsoBDYeyaRlPaSQU8FIqOxU14ygQrYZ5m/mvBF4HomD69D wk4RcdYq26ECk7dvkIHcSGXksFc4HCe5wTJ3kAM4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tomi Valkeinen , Andrzej Hajda , Sasha Levin Subject: [PATCH 4.20 22/92] drm/bridge: tc358767: reject modes which require too much BW Date: Mon, 18 Feb 2019 14:42:25 +0100 Message-Id: <20190218133456.800168913@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190218133454.668268457@linuxfoundation.org> References: <20190218133454.668268457@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 51b9e62eb6950c762162ab7eb8390990179be067 ] The current driver accepts any videomode with pclk < 154MHz. This is not correct, as with 1 lane and/or 1.62Mbps speed not all videomodes can be supported. Add code to reject modes that require more bandwidth that is available. Signed-off-by: Tomi Valkeinen Reviewed-by: Andrzej Hajda Signed-off-by: Andrzej Hajda Link: https://patchwork.freedesktop.org/patch/msgid/20190103115954.12785-6-tomi.valkeinen@ti.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/bridge/tc358767.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index ab299f4debfa..a1f3dd2afbb1 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -1114,10 +1114,20 @@ static bool tc_bridge_mode_fixup(struct drm_bridge *bridge, static enum drm_mode_status tc_connector_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode) { + struct tc_data *tc = connector_to_tc(connector); + u32 req, avail; + u32 bits_per_pixel = 24; + /* DPI interface clock limitation: upto 154 MHz */ if (mode->clock > 154000) return MODE_CLOCK_HIGH; + req = mode->clock * bits_per_pixel / 8; + avail = tc->link.base.num_lanes * tc->link.base.rate; + + if (req > avail) + return MODE_BAD; + return MODE_OK; } -- 2.19.1