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Tue, 23 Jan 2018 23:49:22 -0500 Received: from mail-by2nam03on0117.outbound.protection.outlook.com ([104.47.42.117]:41259 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932502AbeAXEQH (ORCPT ); Tue, 23 Jan 2018 23:16:07 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Andrey Gusakov , Andrzej Hajda , Sasha Levin Subject: [PATCH AUTOSEL for 4.14 080/100] drm/bridge: tc358767: do no fail on hi-res displays Thread-Topic: [PATCH AUTOSEL for 4.14 080/100] drm/bridge: tc358767: do no fail on hi-res displays Thread-Index: AQHTlMnq5iOhZ2E8o0eEakpL58PQzw== Date: Wed, 24 Jan 2018 04:15:06 +0000 Message-ID: <20180124041414.32065-80-alexander.levin@microsoft.com> References: <20180124041414.32065-1-alexander.levin@microsoft.com> In-Reply-To: <20180124041414.32065-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1078;6:r90N6ScGl4y6dsfppPqtmsqpzz+UftJbtKHK4AzBd1NB5bKAh/u9mmzhHDXjfex49xzURpnhHy6ZdjFMO+B/cqYOkMvHlGWzrd6y/QlK9GcNB8G35Wy1TH1GwyFsVf31Hu1DoBwuausJmz8xVTEFDUBthYgB21/xqYLRTnAyQ4RP2rGpPrOfM2QdEAn4GFVmqyNbQ3QWnGwyold3I48W9RWW+OPfWc8BscJMWF4wBTQVT/XKxxmfJ4KYLYvo4SlBHof0CRftF9VHsGwBXw4G4olcy4Cw+pa61KqGyimIGQ4tMLe/BGbKTkjE7DCuafZaea2q8VdlDpR74HMaAs2q2mX7e2YYFRCdSID0ZZryV5pqBuASi7mtc3T4nZBywCgW;5:ZmFT6uN8kyQrxGDT0xCiivCEzNf8uxVLTjBuXZFYe4i21AwNq5Dd5bIOPrOiR66BDclxxvSb7u3YTetMGN03qFO0q4Eo2+pTB/ljhT3L/FZ/d9YHrXX6semZDsQATOns8pXjIT32v4a8eBCTJrNxOZaQ/1MC6gfYmz5fKbbcl2U=;24:qfvfax0j7CsmaeXFl3sO28jxMsBJyLDQgI8gEHSdsbhnUHoFGIZHFjGFBnTcFIvcATqwhbTB1CCh6XMkrVEHQWrm3b6Ppbek/O/1ZoQJifM=;7:wqRw0+tTy7t+U2zvZSUGJuBnyUsey//I6gEKf/ELef47TLNa0a4w4hoSwPnB3kw/FapMWsP+dtjJCQ/PjrImHU2LqfXdWAT/Hc5fDbMLka8IFLAVQcl+3JiAvI22U6Ze9kbMgvjuNd7xZXY8I16jteKT1JQhq9LL1L/g/BlBegSLRfOVjSGkTGl+ZB69iX0sp3DwJL0LZlISOOltdhxFqZKaLc6FY1sOYOyRxnuqO56+wf3hluYwSPCEKa2R+ib6 x-ms-office365-filtering-correlation-id: 185fcd52-fa10-4c30-896d-08d562e12ddd x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(2017052603307)(7193020);SRVR:DM5PR2101MB1078; 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authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: PDawb1r+CG/Jx7pe7dA1mCvKTptxvXYccPhNP3GBJrUi4tVlIiu8TYTv0aJZs6S1NXq/h/72WPE9dt0L/LU9dg== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 185fcd52-fa10-4c30-896d-08d562e12ddd X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jan 2018 04:15:06.6327 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1078 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Andrey Gusakov [ Upstream commit cffd2b16c01c3431a7a7dd62e722af33490fc436 ] Do not fail data rates higher than 2.7 and more than 2 lanes. Try to fall back to 2.7Gbps and 2 lanes. Acked-by: Philipp Zabel Reviewed-by: Andrzej Hajda Signed-off-by: Andrey Gusakov Signed-off-by: Andrzej Hajda Link: https://patchwork.freedesktop.org/patch/msgid/1510073785-16108-2-git-= send-email-andrey.gusakov@cogentembedded.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/bridge/tc358767.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc3= 58767.c index 8571cfd877c5..e1996dbfb0a1 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -603,8 +603,15 @@ static int tc_get_display_props(struct tc_data *tc) ret =3D drm_dp_link_probe(&tc->aux, &tc->link.base); if (ret < 0) goto err_dpcd_read; - if ((tc->link.base.rate !=3D 162000) && (tc->link.base.rate !=3D 270000)) - goto err_dpcd_inval; + if (tc->link.base.rate !=3D 162000 && tc->link.base.rate !=3D 270000) { + dev_dbg(tc->dev, "Falling to 2.7 Gbps rate\n"); + tc->link.base.rate =3D 270000; + } + + if (tc->link.base.num_lanes > 2) { + dev_dbg(tc->dev, "Falling to 2 lanes\n"); + tc->link.base.num_lanes =3D 2; + } =20 ret =3D drm_dp_dpcd_readb(&tc->aux, DP_MAX_DOWNSPREAD, tmp); if (ret < 0) @@ -637,9 +644,6 @@ static int tc_get_display_props(struct tc_data *tc) err_dpcd_read: dev_err(tc->dev, "failed to read DPCD: %d\n", ret); return ret; -err_dpcd_inval: - dev_err(tc->dev, "invalid DPCD\n"); - return -EINVAL; } =20 static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *= mode) --=20 2.11.0