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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 ADA84C10F00 for ; Sat, 7 Mar 2020 20:08:25 +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 8295820684 for ; Sat, 7 Mar 2020 20:08:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8295820684 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ravnborg.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 67CDA6E107; Sat, 7 Mar 2020 20:08:24 +0000 (UTC) Received: from asavdk4.altibox.net (asavdk4.altibox.net [109.247.116.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id C78E66E107 for ; Sat, 7 Mar 2020 20:08:22 +0000 (UTC) Received: from ravnborg.org (unknown [158.248.194.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by asavdk4.altibox.net (Postfix) with ESMTPS id C7F2880560; Sat, 7 Mar 2020 21:08:14 +0100 (CET) Date: Sat, 7 Mar 2020 21:08:13 +0100 From: Sam Ravnborg To: Thomas Zimmermann Subject: Re: [PATCH 00/22] drm: Convert drivers to drm_simple_encoder_init() Message-ID: <20200307200813.GA15363@ravnborg.org> References: <20200305155950.2705-1-tzimmermann@suse.de> <20200306142212.GF4878@pendragon.ideasonboard.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CMAE-Score: 0 X-CMAE-Analysis: v=2.3 cv=XpTUx2N9 c=1 sm=1 tr=0 a=UWs3HLbX/2nnQ3s7vZ42gw==:117 a=UWs3HLbX/2nnQ3s7vZ42gw==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=kj9zAlcOel0A:10 a=P1BnusSwAAAA:8 a=7gkXJVJtAAAA:8 a=S-uJQXsthdm-Wup5EDkA:9 a=CjuIK1q_8ugA:10 a=D0XLA9XvdZm18NrgonBM:22 a=E9Po1WZjFZOl8hwRPBS3:22 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: ludovic.desroches@microchip.com, hamohammed.sa@gmail.com, alexandre.belloni@bootlin.com, airlied@linux.ie, dri-devel@lists.freedesktop.org, linux@armlinux.org.uk, paul@crapouillou.net, linux-tegra@vger.kernel.org, thierry.reding@gmail.com, Laurent Pinchart , linux-samsung-soc@vger.kernel.org, jy0922.shim@samsung.com, hjc@rock-chips.com, abrodkin@synopsys.com, sebastian.reichel@collabora.com, krzk@kernel.org, jonathanh@nvidia.com, linux-rockchip@lists.infradead.org, wens@csie.org, tomi.valkeinen@ti.com, linux-imx@nxp.com, xinliang.liu@linaro.org, kong.kongxinwei@hisilicon.com, puck.chen@hisilicon.com, s.hauer@pengutronix.de, alison.wang@nxp.com, jsarha@ti.com, linux-mediatek@lists.infradead.org, matthias.bgg@gmail.com, virtualization@lists.linux-foundation.org, jernej.skrabec@siol.net, rodrigosiqueiramelo@gmail.com, bbrezillon@kernel.org, jingoohan1@gmail.com, sw0312.kim@samsung.com, nicolas.ferre@microchip.com, kyungmin.park@samsung.com, kieran.bingham+renesas@ideasonboard.com, kgene@kernel.org, kernel@pengutronix.de, zourongrong@gmail.com, shawnguo@kernel.org, kraxel@redhat.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi Thomas. On Fri, Mar 06, 2020 at 04:18:52PM +0100, Thomas Zimmermann wrote: > Hi Laurent > > Am 06.03.20 um 15:22 schrieb Laurent Pinchart: > > Hi Thomas, > > > > Thank you for the patch. > > > > On Thu, Mar 05, 2020 at 04:59:28PM +0100, Thomas Zimmermann wrote: > >> A call to drm_simple_encoder_init() initializes an encoder without > >> further functionality. It only provides the destroy callback to > >> cleanup the encoder's state. Only few drivers implement more > >> sophisticated encoders than that. Most drivers implement such a > >> simple encoder and can use drm_simple_encoder_init() instead. > >> > >> The patchset converts drivers where the encoder's instance is > >> embedded in a larger data structure. The driver releases the > >> memory during cleanup. Each patch replaces drm_encoder_init() with > >> drm_simple_encoder_init() and removes the (now unused) driver's > >> encoder functions. > >> > >> While the patchset is fairly large, the indiviual patches are self- > >> contained and can be merged independently from each other. The > >> simple-encoder functionality is currently in drm-misc-next, where > >> these patches could go as well. > > > > I've reviewed the whole series, including verifying that the few > > instances of struct drm_encoder_funcs that were not declared const were > > not modified somewhere to add more function pointers. > > > > Reviewed-by: Laurent Pinchart > > Thanks for the detailed review. > > > > > for all the patches. > > > > However, I'd like to note that drm_simple_encoder_init() is a bit of a > > misnommer here. Several of the encoders in those drivers to implement > > additional functionality. They just expose them through > > drm_encoder_helper_funcs, not drm_encoder_funcs. > > True. It's called 'simple encoder' for the lack of a better name. It's > part of the simple KMS helpers, so the name's at least consistent. OTOH > I always find drm_simple_display_pipe a bad name. > > We can still rename the simple-encoder function without much effort. I'm > open for suggestions. IMO this does not belong in drm_simple_kms - but in drm_encoder. This only occurs to me after looking a bit more on the patches, you would have loved to get this feedback earlier. Most users do not need their owm drm_encoder_funcs definition, and would be happy with the default as provided by drm_simple_* As the cleanup is handled automatically when the drm device is teared down (in mode_config_rest()) I considered if we could here use the drmm_ namespace - but that felt wrong. My proposal is the following: - Move the implementation to drm_encoder.c - Name it drm_encoder_init_nofuncs() The patches posted in this thread would be a little simpler as they would loose the added include file. And the three drivers using the current infrastructure would need a small update. I you decide to keep the current approach where the functions are in drm_simple_* then the full series is: Acked-by: Sam Ravnborg But I think moving it to drm_encoder.c would be the approach that would make it simpler to understand/follow. So that get my (biased) vote. Sam _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel