From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:57190 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752338AbeBANMq (ORCPT ); Thu, 1 Feb 2018 08:12:46 -0500 Subject: Patch "drm/bridge: tc358767: do no fail on hi-res displays" has been added to the 4.14-stable tree To: andrey.gusakov@cogentembedded.com, a.hajda@samsung.com, alexander.levin@verizon.com, gregkh@linuxfoundation.org, p.zabel@pengutronix.de Cc: , From: Date: Thu, 01 Feb 2018 14:12:11 +0100 Message-ID: <1517490731132114@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled drm/bridge: tc358767: do no fail on hi-res displays to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-bridge-tc358767-do-no-fail-on-hi-res-displays.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Thu Feb 1 13:45:42 CET 2018 From: Andrey Gusakov Date: Tue, 7 Nov 2017 19:56:19 +0300 Subject: drm/bridge: tc358767: do no fail on hi-res displays 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 Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/bridge/tc358767.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) --- 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 t ret = drm_dp_link_probe(&tc->aux, &tc->link.base); if (ret < 0) goto err_dpcd_read; - if ((tc->link.base.rate != 162000) && (tc->link.base.rate != 270000)) - goto err_dpcd_inval; + if (tc->link.base.rate != 162000 && tc->link.base.rate != 270000) { + dev_dbg(tc->dev, "Falling to 2.7 Gbps rate\n"); + tc->link.base.rate = 270000; + } + + if (tc->link.base.num_lanes > 2) { + dev_dbg(tc->dev, "Falling to 2 lanes\n"); + tc->link.base.num_lanes = 2; + } ret = drm_dp_dpcd_readb(&tc->aux, DP_MAX_DOWNSPREAD, tmp); if (ret < 0) @@ -637,9 +644,6 @@ static int tc_get_display_props(struct t 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; } static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode) Patches currently in stable-queue which might be from andrey.gusakov@cogentembedded.com are queue-4.14/drm-bridge-tc358767-fix-timing-calculations.patch queue-4.14/drm-bridge-tc358767-fix-auxdatan-registers-access.patch queue-4.14/drm-bridge-tc358767-filter-out-too-high-modes.patch queue-4.14/drm-bridge-tc358767-fix-1-lane-behavior.patch queue-4.14/drm-bridge-tc358767-fix-dp0_misc-register-set.patch queue-4.14/drm-bridge-tc358767-do-no-fail-on-hi-res-displays.patch