From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x224iGaGojMXHTTOsM9RjYnt67fBOPvKet4e+P5t99pT0ZKbn8lrfzKeR1xgQYWECZ8a6gaGz ARC-Seal: i=1; a=rsa-sha256; t=1517591205; cv=none; d=google.com; s=arc-20160816; b=sNXCprO8JhowcHKjeCHB6P0qAUK1tjK/oR8sAOmG+sbpDbqYZC19hQYsfr77BV4S87 ekKxJLwaTO0E12q6M9XsJD+o3ZfcmB4EMwgIM3DE/wDKEmmFBd6NXOd3p0G14wG/OsR6 Sw+tPPS8gfeH+g72PYvZjvu7fjbWlvA/qUrruVcEKWnczd9PI8opGFvO7arGcEiKAFQe YCvEvD4OP9NmMOOwRRk1/25KoI0b7rBcuJj/fOw2lBTXwe2MaqOtERHyhq+/NHgkYXkq gJZyKDf35eooRCegRH9p3wiaLX9cVamhc/wEYGmDLkrxtNjUxA9mjJuCmBJ30405dVPB yybw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=aHq5udxkgcQbbPyVlwSnX8jJBC3qqMrKh+RmtpvttGI=; b=FVwUWXz6rFbGGTvbf2B8ZVt/gr43ro0Gc/L5yJ1dHfuon4VGB01uf5/2EfeltEPyjv i5FoFFON/pnEGZCnI80CHWwn5wzhqwg8G7INtmW0bC3yneO3Xud45hpqVlq0f6QzxhXf 3pXulHsSKV/Z1dVEyT8Rnb2spNReHS2Aofss5u2weIz4/Du6bCFmM2oqDdmZU+uzdrsS QFyjclPf/dXzz57K9m2KpKkZq6XwiH5Gib0uuekomNrMMtKEGxeYFGH0F2GHrSV8g/Eo dFqrB5nPxge1Le1Xs0rL93FZO31JaLx7VYAI4aM0MbKq0O291EY4nuc2uHxVi2Ms7sM4 6gfw== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Philipp Zabel , Andrzej Hajda , Andrey Gusakov , Sasha Levin Subject: [PATCH 4.9 54/86] drm/bridge: tc358767: do no fail on hi-res displays Date: Fri, 2 Feb 2018 17:58:14 +0100 Message-Id: <20180202140827.266152758@linuxfoundation.org> X-Mailer: git-send-email 2.16.1 In-Reply-To: <20180202140822.679101338@linuxfoundation.org> References: <20180202140822.679101338@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1591309715852709438?= X-GMAIL-MSGID: =?utf-8?q?1591309715852709438?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ 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)