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=2.4 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 1E47AC11D0C for ; Thu, 20 Feb 2020 18:46:32 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E9CE224673 for ; Thu, 20 Feb 2020 18:46:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="tMoWYpRQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E9CE224673 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 75FE289CD7; Thu, 20 Feb 2020 18:46:31 +0000 (UTC) Received: from mail27.static.mailgun.info (mail27.static.mailgun.info [104.130.122.27]) by gabe.freedesktop.org (Postfix) with ESMTPS id B4F9289CD7 for ; Thu, 20 Feb 2020 18:46:14 +0000 (UTC) DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1582224390; h=Content-Type: MIME-Version: Message-ID: Date: Subject: To: From: Sender; bh=aubYGhPIepdsqXsSzHOAT4/niHaZQbjgPeotFzZIp7w=; b=tMoWYpRQT+cAMJ5SfHZsl6IHxftqOQGa6bx8hPNnYkxoAfpMZOQ08io2lYPoFk68CE7x+Zja RrXOS1Stm7yKrl8UwaBVy2C+GOW3KqVdspOm5ycdaoh1EUuQ7aNQhXuNPVijIcCbZKeOm7ch BdL3c6RlURN0SBVzEmK/KLHvQKA= X-Mailgun-Sending-Ip: 104.130.122.27 X-Mailgun-Sid: WyJkOTU5ZSIsICJkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e4ed3e7.7f8252242f10-smtp-out-n02; Thu, 20 Feb 2020 18:45:59 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id B9A8DC4479F; Thu, 20 Feb 2020 18:45:58 +0000 (UTC) Received: from JEYKUMAR1 (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: jsanka) by smtp.codeaurora.org (Postfix) with ESMTPSA id D6CD3C43383; Thu, 20 Feb 2020 18:45:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org D6CD3C43383 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=jsanka@codeaurora.org From: To: "'Sean Paul'" , "'Rob Clark'" , Subject: Support for early wakeup in DRM Date: Thu, 20 Feb 2020 10:45:57 -0800 Message-ID: <00e901d5e81d$fd609ac0$f821d040$@codeaurora.org> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 16.0 Content-Language: en-us Thread-Index: AdXoHfy9XNgzjYeuQouCBuTEDJRhEg== X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1236610591==" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This is a multipart message in MIME format. --===============1236610591== Content-Type: multipart/alternative; boundary="----=_NextPart_000_00EA_01D5E7DA.EF3DCFF0" Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_00EA_01D5E7DA.EF3DCFF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hello All, I am seeking recommendations for DRM compatible methods of updating the HW other than frame commit path. When exiting idle/runtime_suspend, the driver votes for a bunch of resources including power/clk/bandwidth as a part of first commit handling. This usually adds a few millisecond delay before processing the frame. The requirement is to find possible ways to reduce this delay by providing an early intimation to the framework to "prepare" the HW by voting for the resources and keep the HW ready to process an imminent frame commit. Especially in performance oriented Automotive world, these delays are very time critical and we are working on ways to mitigate them. DRM framework converges all the parameters affecting the HW in terms of DRM properties in a single COMMIT call. To address the above issue, we need a parallel channel which should allow the framework to make necessary changes to the HW without violating the master access privileges. Before resorting to custom downstream ways, I want to check with the community for folks who might have encountered and resolved such issues. Thanks and Regards, Jeykumar S Qualcomm Inc. ------=_NextPart_000_00EA_01D5E7DA.EF3DCFF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hello All,

I am seeking recommendations for DRM = compatible methods of updating the HW other than frame commit path. When = exiting idle/runtime_suspend, the driver votes for a bunch of resources = including power/clk/bandwidth as a part of first commit handling. This = usually adds a few millisecond delay before processing the frame. The = requirement is to find possible ways to reduce this delay by providing = an early intimation to the framework to “prepare” the HW by = voting for the resources and keep the HW ready to process an imminent = frame commit. Especially in performance oriented Automotive world, these = delays are very time critical and we are working on ways to mitigate = them.  

 

DRM framework converges all the parameters = affecting the HW in terms of DRM properties in a single COMMIT call. To = address the above issue, we need a parallel channel which should allow = the framework to make necessary changes to the HW without violating the = master access privileges.

 

Before resorting to custom downstream ways, I = want to check with the community for folks who might have encountered = and resolved such issues.

 

Thanks and Regards,

Jeykumar S

Qualcomm = Inc.

 

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