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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Uvp2LKsWFV+HPqYTA/6/y1AQwy9iRQHNO8CgpqyQps0=; b=Fm8DKYwHgzef5aqLh7zCRjUvAffeiqYc2rmKkFVfRtAytA/r+y1K1GwXlyd7J2ef+e tV+9Fxw+8kN5WNyRRkQLotNR89MYUE7ZT+BTzGhmq4jO6gTmpGNUTwo3RbDCUeF+VLT0 5zPSfT31GNqdQ8lZdcVyg3D1f2MeApMVKTFlE1FJPIE0Bw2h7dMmS7A3SRlFRcW0T5NK 6xU1QeFid1lmbhNXv3RPEcromQefbzx21gxzGds7sSpbO/izq1gAFov+KQfKJ6bO2nPN 1/440sHZRhDeA+l4ko2yxH4gi1rldrpQyS8LFuuqCuNduHrUdTmfv9V74b24p2by50Wj XziA== X-Gm-Message-State: AOAM5337spRSsxIRzQCoqJ20RYyZX6rR0qz22yqe0pUrahpodco4HGGg nImLwZWd79935e4b/2LhxtyADebmdNx1PhCK47pBdA== X-Google-Smtp-Source: ABdhPJwws7H4KNruNrz6E97+kcRL3M8/X6GOh5v04WYHUc0AjNQO3Z/2ZE9PQBIgoiKIDfWPidJN5lVMnTpURgjYy2g= X-Received: by 2002:a2e:810e:: with SMTP id d14mr1855297ljg.100.1601411373462; Tue, 29 Sep 2020 13:29:33 -0700 (PDT) MIME-Version: 1.0 References: <20200928200856.1897023-1-pcc@google.com> <0dc9f36b-417d-bfad-9eb7-858c3041ff0c@baylibre.com> <20200929093201.GL438822@phenom.ffwll.local> <20200929164828.GP438822@phenom.ffwll.local> <20200929165206.GQ438822@phenom.ffwll.local> In-Reply-To: From: Linus Walleij Date: Tue, 29 Sep 2020 22:29:22 +0200 Message-ID: Subject: Re: [PATCH] Revert "video: fbdev: amba-clcd: Retire elder CLCD driver" To: Daniel Vetter X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200929_162935_299673_F7BDE057 X-CRM114-Status: GOOD ( 10.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Neil Armstrong , Sean Paul , Kevin Brodsky , Russell King , ML dri-devel , Eric Anholt , Peter Collingbourne , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Sep 29, 2020 at 8:44 PM Daniel Vetter wrote: > On Tue, Sep 29, 2020 at 7:49 PM Peter Collingbourne wrote: > But aside from all this, why is this blocking the migration from fbdev > to drm? With fbdev you don't have buffer allocations, nor dma-buf > support, and somehow android can boot. I do not know how Android does things these days but back in the days it would request a virtual framebuffer twice the height of the physical framebuffer and then pan that up/down between composing frames, thus achieving a type of double-buffering from userspace. Given the type of bugs Peter is seeing this seems to still be the case, Peter can you confirm? Yours, Linus Walleij _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 74205C4727F for ; Tue, 29 Sep 2020 20:29:37 +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 EBA452076B for ; Tue, 29 Sep 2020 20:29:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="sht/fVKs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EBA452076B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.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 E5FFB89BF1; Tue, 29 Sep 2020 20:29:35 +0000 (UTC) Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2BC7689BF1 for ; Tue, 29 Sep 2020 20:29:35 +0000 (UTC) Received: by mail-lj1-x241.google.com with SMTP id r24so5143351ljm.3 for ; Tue, 29 Sep 2020 13:29:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Uvp2LKsWFV+HPqYTA/6/y1AQwy9iRQHNO8CgpqyQps0=; b=sht/fVKs372hvHFeW6wZN3AhYjl6BI/0lDKKCvVZZNRnH4lmLdBgwHjVDXIOVMN64A oZMp88l/7mM9yuB9f6Z8oHDLcxf4yYbCggZgNLPGBokCCr/xEGNLnV96QhEBpvbRqlyc +ngYf0iNVuRATx570nTzlGzPzUOKGTn6+tGM8aFORgZSwqVR+fTnrifFoWDQRk3DXFX/ SIMy7a9d2pjem8+P/fyMR0FNVVdv+pOJM68rY7N/IgnAP3TKLtAwyXve0nd9KgRl76T0 PdtZlCyAgKmd0eyO8CUkjNFOr/rMtcWsmFhbl069SnjIN9jg46YKj9kb/IbQZ7HqghAN T1WA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Uvp2LKsWFV+HPqYTA/6/y1AQwy9iRQHNO8CgpqyQps0=; b=nBgHa6PvIcNVJuf+izoggcuuiKCuqnw6qhvipve+NDfpY961+22rXrHypbTQFJpXHi /qasLtS1zYyuaZIBthX0HG00DCpjUJdIsFMmyy2zpmOkIiLnEywx0z6xq2W81EMNiygZ j0yq6WzIgR4dSlc6jKPc+RUpbU+TYGDey+WgLIyIwPVhWxAcAUcpMtISjMDqN9U0LQL2 N3glyNrTf01nD0SPkU3ks0YveVRVGlgeILQB/SLxZYf35tI23TyzjdubkFrSsJilvpSL pho6NTowH7CgqRbJjsBztzD4oqNWPjUL0LjIM8ZrU9BuZGAmBQEy8Wfx4PA+4oDMj5z/ s/Gg== X-Gm-Message-State: AOAM532+FBg1xxMK5RlzP7TBPupuuXJIVxFdoYztcG6OBaEB8mcmr7JP h2PmmyNp0+Hq7URWKzfdwzxJZLX9etsYSnPJzJyK3dK1Hzqrqw== X-Google-Smtp-Source: ABdhPJwws7H4KNruNrz6E97+kcRL3M8/X6GOh5v04WYHUc0AjNQO3Z/2ZE9PQBIgoiKIDfWPidJN5lVMnTpURgjYy2g= X-Received: by 2002:a2e:810e:: with SMTP id d14mr1855297ljg.100.1601411373462; Tue, 29 Sep 2020 13:29:33 -0700 (PDT) MIME-Version: 1.0 References: <20200928200856.1897023-1-pcc@google.com> <0dc9f36b-417d-bfad-9eb7-858c3041ff0c@baylibre.com> <20200929093201.GL438822@phenom.ffwll.local> <20200929164828.GP438822@phenom.ffwll.local> <20200929165206.GQ438822@phenom.ffwll.local> In-Reply-To: From: Linus Walleij Date: Tue, 29 Sep 2020 22:29:22 +0200 Message-ID: Subject: Re: [PATCH] Revert "video: fbdev: amba-clcd: Retire elder CLCD driver" To: Daniel Vetter 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: Neil Armstrong , Sean Paul , Kevin Brodsky , Russell King , ML dri-devel , Peter Collingbourne , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Tue, Sep 29, 2020 at 8:44 PM Daniel Vetter wrote: > On Tue, Sep 29, 2020 at 7:49 PM Peter Collingbourne wrote: > But aside from all this, why is this blocking the migration from fbdev > to drm? With fbdev you don't have buffer allocations, nor dma-buf > support, and somehow android can boot. I do not know how Android does things these days but back in the days it would request a virtual framebuffer twice the height of the physical framebuffer and then pan that up/down between composing frames, thus achieving a type of double-buffering from userspace. Given the type of bugs Peter is seeing this seems to still be the case, Peter can you confirm? Yours, Linus Walleij _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel