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,DKIM_VALID_AU,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 2209EC282C4 for ; Sat, 9 Feb 2019 18:56:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E642A21916 for ; Sat, 9 Feb 2019 18:56:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549738606; bh=vhSyGlSfNiaxv2u5D6pn5vHFf9zDklCeNazlJitckDE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lMDn8X8FI6CuwOEOxjaA9JQ/SBTURxPmfXvUYDlr375SzZogwVfhGVi5oyLp+AEBF yu9H3IKmGr4rSRkueYzuvjq2EglXdynRc1z1p7Ahqv0eVg67Q0V8OuzJZIXOEkumPK r+8SkCgr48UOdk0Ihiifqlbgb/91Fm+2y52RvaeY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728087AbfBIS4o (ORCPT ); Sat, 9 Feb 2019 13:56:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:60712 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727464AbfBISr4 (ORCPT ); Sat, 9 Feb 2019 13:47:56 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 17AC72192C; Sat, 9 Feb 2019 18:47:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549738075; bh=vhSyGlSfNiaxv2u5D6pn5vHFf9zDklCeNazlJitckDE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hpjCYVcl+kj96DlzN16EilMJ016j26sD/TnL5LTPos1nz00hiGVlED4NX+hBjM3fY /kP/3lA8o+P0yXcmB7w0mYhXP+DTzOUjHmcPytnqx5C7Wv0KkTGpN5dj12M4jYKE9M pGBBjBEfiKBIwtkXzUh4s/EBHwa0AwulOUoJWkcA= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Tomi Valkeinen , Andrzej Hajda , Sasha Levin , dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.20 19/42] drm/bridge: tc358767: reject modes which require too much BW Date: Sat, 9 Feb 2019 13:47:11 -0500 Message-Id: <20190209184734.125935-19-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190209184734.125935-1-sashal@kernel.org> References: <20190209184734.125935-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tomi Valkeinen [ 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