From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=85.214.240.192 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794769840; b=FJjQ6ZL7fnYyc+lUpnw/bNzXp+Wnnfgbz56HTJ4gn27m5gBNF5ONyr5GaFal6aqRySSk 19ROmMTQNoDhxp9PzSvEZnAKkWSEnZWpPvTYSNtiVvvCHJCUUFdrH6WAAQ14xXq6Fy4RT zAPtGrjpb7XZoIgpwUpU87gd271zpLuRFxnpHRu+hVLhTxlHKjzyZq6HIujnJjZH4AOlt bswTnswglOF/vPFbp+ehfz/wpYLGXvjeW0BXaeKWk6njjXjHwKybYzJu+n7dzfmXu9nWP VUBWG6p0OpPz0t/X5nPRPJGjE15Fn1Jt9xMWcTZHjz+2ttPNoV8xmDyxjIk9mpnnjQA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794769840; h=DMARC-Filter:Received:Date:From:To:Cc:Subject:Message-ID:In-Reply-To: References:X-Mailer:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=LtF+ZicJDI4fmgfCu+Ij9MY3N9bkIMYd5p+PyPTG2Fk=; b=OICFJPv7QlRQpQ4/qMt4jDo4zx4d2kCKO5j+eW5tNFvAMzpDRkzx7f0hg4x71NZxNO2w UrXy++jrgtzFokAaUq8UOXbFrskNIO0UrACBqhYDsLACSrBfZMEvHqutrDazfHy2NBncA 75Hzp7wDKkCJEp/5fAC03yvUCH8yefS6zEmyvKknc8ZpvbENrvs9Df3eURglSFAHqVccK ZV2GN5/VvW+Df6jeblwLy+/BCBmSv0fRtdKKKv5N8TJCAXHzqorq5j0yH0gQWDxffRjuj ZjTt5y3qFOAYiOqqnCIvQHHqEe0jeb2h/dlmKbo6JEzLjVpflKFqlwPEm2MfZrQjI2Q== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none header.from=sraa.de; spf=pass smtp.mailfrom=sraa.de; arc=none smtp.remote-ip=85.214.240.192 Received: from sraa.de (sraa.de [85.214.240.192]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 56DF3606A32C; Sun, 15 Nov 2026 19:10:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 56DF3606A32C Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sraa.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sraa.de Received: from [161.142.148.162] (helo=ryzen) by sraa.de with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1xSfcX-00FyWm-7L; Sun, 15 Nov 2026 20:10:33 +0100 Date: Mon, 16 Nov 2026 03:10:26 +0800 From: Sebastian Raase To: Hans de Goede Cc: Sebastian Raase , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Helge Deller Subject: Re: [PATCH 0/2] Add monochrome framebuffer support to simple-framebuffer Message-ID: <20261116031026.2afde847@ryzen> In-Reply-To: References: X-Mailer: Claws Mail 4.3.1 (GTK 3.24.49; x86_64-pc-linux-gnu) X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Hi Hans, On Wed, 11 Nov 2026 12:15:36 +0100 Hans de Goede wrote: > Hi Sebastian, > > On 4-Nov-26 03:34, Sebastian Raase wrote: > > This patch series adds support for monochrome framebuffers (1 bpp, > > packed-pixel) to simple-framebuffer. > > > > Monochrome framebuffers require far less video memory and bandwidth > > than 16bpp or 32bpp framebuffers, making them useful for small > > devices or FPGA implementations. > > Thank you for your patch-series and I see that Helge has just > applied this to the fbdev tree. This may need a revision because of the DT bindings discussion. I agree with Thomas that 'mono' was not a particularly good choice of name. > Have you considered also extending the simpledrm driver to also > support these monochrome formats there ? I have, but my target environment does not support simpledrm (DRM doesn't work with CONFIG_NOMMU), so I could not test it. It's a very basic Busybox-based system, not a full distribution. > Most Linux distributions now a days have switched from using simplefb > to using simpledrm. > > But I must admit I've no idea how well the drm subsys / kernel-mode- > setting API handles monochrome formats. > > Regards, > > Hans Best Regards, Sebastian