From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 91871] link retraining for DP not possible with current design of Atomic modeset framework Date: Thu, 03 Sep 2015 19:26:00 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1064436824==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id D425E6E391 for ; Thu, 3 Sep 2015 12:26:00 -0700 (PDT) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1064436824== Content-Type: multipart/alternative; boundary="1441308360.6A84a0.28220"; charset="UTF-8" --1441308360.6A84a0.28220 Date: Thu, 3 Sep 2015 19:26:00 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=91871 Bug ID: 91871 Summary: link retraining for DP not possible with current design of Atomic modeset framework Product: DRI Version: XOrg git Hardware: All OS: All Status: NEW Severity: normal Priority: medium Component: General Assignee: dri-devel@lists.freedesktop.org Reporter: sivakumar.thulasimani@intel.com DP spec requires Link training from highest link rate supported by panel to lowest link rate supported by panel. It is not possible to implement this in the current atomic modeset logic since it splits modeset into two half atomic_check and atomic_commit, where it is expected all values to be calculated in atomic_check and programmed in atomic_commit. link training being a negotiation phase of DP modeset it is not possible to predict if a training at certain link rate will succeed or not. if it does fail it will require us to disable, calculate new values and enable pll. this is not possible in current DRM Atomic modeset framework. -- You are receiving this mail because: You are the assignee for the bug. --1441308360.6A84a0.28220 Date: Thu, 3 Sep 2015 19:26:00 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"
Bug ID 91871
Summary link retraining for DP not possible with current design of Atomic modeset framework
Product DRI
Version XOrg git
Hardware All
OS All
Status NEW
Severity normal
Priority medium
Component General
Assignee dri-devel@lists.freedesktop.org
Reporter sivakumar.thulasimani@intel.com 

DP spec requires Link training from highest link rate supported by panel to
lowest link rate supported by panel. 

It is not possible to implement this in the current atomic modeset logic since
it splits modeset into two half atomic_check and atomic_commit, where it is
expected all values to be calculated in atomic_check and programmed in
atomic_commit. 

link training being a negotiation phase of DP modeset it is not possible to
predict if a training at certain link rate will succeed or not. if it does fail
it will require us to disable, calculate new values and enable pll. this is not
possible in current DRM Atomic modeset framework.

You are receiving this mail because:
  • You are the assignee for the bug.
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