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Wed, 16 Jun 2021 03:27:39 -0400 (EDT) Date: Wed, 16 Jun 2021 09:27:36 +0200 From: Maxime Ripard To: Pekka Paalanen Subject: Re: New uAPI for color management proposal and feedback request Message-ID: <20210616072736.7lc7kiahfz7o2kod@gilmour> References: <8c0d7ad8-7ade-bf8a-0414-cc795fbb6aa2@tuxedocomputers.com> <20210607074805.bmonbg5nhr4etab2@gilmour> <20210607110632.6ec38e38@eldfell> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <20210607110632.6ec38e38@eldfell> 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: , Cc: "Deucher, Alexander" , intel-gfx@lists.freedesktop.org, Maling list - DRI developers , amd-gfx list , Werner Sembach Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi Pekka, On Mon, Jun 07, 2021 at 11:06:32AM +0300, Pekka Paalanen wrote: > On Mon, 7 Jun 2021 09:48:05 +0200 > Maxime Ripard wrote: >=20 > > I've started to implement this for the raspberrypi some time ago. > >=20 > > https://github.com/raspberrypi/linux/pull/4201 > >=20 > > It's basically two properties: a bitmask of the available output pixel > > encoding to report both what the display and the controller supports, > > and one to actually set what the userspace wants to get enforced (and > > that would return the active one when read). >=20 > Hi Maxime, >=20 > I would like to point out that I think it is a bad design to create a > read/write property that returns not what was written to it. It can > cause headaches to userspace that wants to save and restore property > values it does not understand. Userspace would want to do that to > mitigate damage from switching to another KMS client and then back. The > other KMS client could change properties the first KMS client does not > understand, causing the first KMS client to show incorrectly after > switching back. >=20 > Please, consider whether this use-case will work before designing a > property where read-back may not necessarily return the written value. Thanks for bringing that up. I guess the work being done currently by Werner and his active color format property addresses that concern :) Maxime 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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 2DA67C48BE8 for ; Wed, 16 Jun 2021 07:27:44 +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 EE0D66128C for ; Wed, 16 Jun 2021 07:27:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EE0D66128C Authentication-Results: mail.kernel.org; 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Wed, 16 Jun 2021 03:27:39 -0400 (EDT) Date: Wed, 16 Jun 2021 09:27:36 +0200 From: Maxime Ripard To: Pekka Paalanen Message-ID: <20210616072736.7lc7kiahfz7o2kod@gilmour> References: <8c0d7ad8-7ade-bf8a-0414-cc795fbb6aa2@tuxedocomputers.com> <20210607074805.bmonbg5nhr4etab2@gilmour> <20210607110632.6ec38e38@eldfell> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210607110632.6ec38e38@eldfell> Subject: Re: [Intel-gfx] New uAPI for color management proposal and feedback request X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Deucher, Alexander" , intel-gfx@lists.freedesktop.org, Maling list - DRI developers , amd-gfx list Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Hi Pekka, On Mon, Jun 07, 2021 at 11:06:32AM +0300, Pekka Paalanen wrote: > On Mon, 7 Jun 2021 09:48:05 +0200 > Maxime Ripard wrote: > > > I've started to implement this for the raspberrypi some time ago. > > > > https://github.com/raspberrypi/linux/pull/4201 > > > > It's basically two properties: a bitmask of the available output pixel > > encoding to report both what the display and the controller supports, > > and one to actually set what the userspace wants to get enforced (and > > that would return the active one when read). > > Hi Maxime, > > I would like to point out that I think it is a bad design to create a > read/write property that returns not what was written to it. It can > cause headaches to userspace that wants to save and restore property > values it does not understand. Userspace would want to do that to > mitigate damage from switching to another KMS client and then back. The > other KMS client could change properties the first KMS client does not > understand, causing the first KMS client to show incorrectly after > switching back. > > Please, consider whether this use-case will work before designing a > property where read-back may not necessarily return the written value. Thanks for bringing that up. I guess the work being done currently by Werner and his active color format property addresses that concern :) Maxime _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx 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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 C9656C48BE5 for ; Wed, 16 Jun 2021 14:51:51 +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 64B4260FD9 for ; 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Wed, 16 Jun 2021 03:27:39 -0400 (EDT) Date: Wed, 16 Jun 2021 09:27:36 +0200 From: Maxime Ripard To: Pekka Paalanen Subject: Re: New uAPI for color management proposal and feedback request Message-ID: <20210616072736.7lc7kiahfz7o2kod@gilmour> References: <8c0d7ad8-7ade-bf8a-0414-cc795fbb6aa2@tuxedocomputers.com> <20210607074805.bmonbg5nhr4etab2@gilmour> <20210607110632.6ec38e38@eldfell> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210607110632.6ec38e38@eldfell> X-Mailman-Approved-At: Wed, 16 Jun 2021 14:51:49 +0000 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Deucher, Alexander" , intel-gfx@lists.freedesktop.org, Maling list - DRI developers , amd-gfx list , Werner Sembach Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" Hi Pekka, On Mon, Jun 07, 2021 at 11:06:32AM +0300, Pekka Paalanen wrote: > On Mon, 7 Jun 2021 09:48:05 +0200 > Maxime Ripard wrote: > > > I've started to implement this for the raspberrypi some time ago. > > > > https://github.com/raspberrypi/linux/pull/4201 > > > > It's basically two properties: a bitmask of the available output pixel > > encoding to report both what the display and the controller supports, > > and one to actually set what the userspace wants to get enforced (and > > that would return the active one when read). > > Hi Maxime, > > I would like to point out that I think it is a bad design to create a > read/write property that returns not what was written to it. It can > cause headaches to userspace that wants to save and restore property > values it does not understand. Userspace would want to do that to > mitigate damage from switching to another KMS client and then back. The > other KMS client could change properties the first KMS client does not > understand, causing the first KMS client to show incorrectly after > switching back. > > Please, consider whether this use-case will work before designing a > property where read-back may not necessarily return the written value. Thanks for bringing that up. I guess the work being done currently by Werner and his active color format property addresses that concern :) Maxime _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx