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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wGC9U-0000000Csha-0cr6; Fri, 24 Apr 2026 08:44:44 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wGC9R-0000000Csh0-0DY0 for linux-arm-kernel@lists.infradead.org; Fri, 24 Apr 2026 08:44:42 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 80AC143E0B; Fri, 24 Apr 2026 08:44:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB358C19425; Fri, 24 Apr 2026 08:44:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777020278; bh=ZPtRTAcO5vKULVkGrPOpdr9dYJKbJwHKAW4LzVRqvoI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=CW7ZL+CRxx2Sijgh6xjUCCZml3UTTpMsXH6cO1EZ6wibNcZoHu595LxCD4AB8p2gn jSaoBI3ElXU1BYxmuOc3NDEcABEdeWKt6wgHB6S1IsWuiFyVWmWv6h/971fYooCBzo RXo6526CET9X621wMlDYeWZctMcReAJzCTJhKeUpGjw8LbqkjVRhIMh6j6vBuXZgaN vJhIZiRh3AQausKSMcfwwnRicX+K/+23ib3tV7aeM7/IdPKDxwRxc5oXLTYFRczQqC tBByluQBB80/irXS/ql/+Ua1O0zUeEjDHWti0vhpQ85qMnzbxJfKvOh6qIr9+EWwRy IX3mNtvMouAVQ== Date: Fri, 24 Apr 2026 10:44:35 +0200 From: Maxime Ripard To: Thomas Zimmermann Cc: Maarten Lankhorst , David Airlie , Simona Vetter , Jonathan Corbet , Shuah Khan , Dmitry Baryshkov , Jyri Sarha , Tomi Valkeinen , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Simon Ser , Harry Wentland , Melissa Wen , Sebastian Wick , Alex Hung , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Chen-Yu Tsai , Samuel Holland , Dave Stevenson , =?utf-8?B?TWHDrXJh?= Canal , Raspberry Pi Kernel Maintenance , dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Stone , intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev Subject: Re: [PATCH v2 15/20] drm/drv: Call drm_mode_config_create_state() by default Message-ID: <20260424-nimble-asparagus-tarsier-15f8bb@houat> References: <20260320-drm-mode-config-init-v2-0-c63f1134e76c@kernel.org> <20260320-drm-mode-config-init-v2-15-c63f1134e76c@kernel.org> <79cc30d5-80b5-4d87-a3ad-36d6fad98853@suse.de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha384; protocol="application/pgp-signature"; boundary="3cb63aedvnuis3py" Content-Disposition: inline In-Reply-To: <79cc30d5-80b5-4d87-a3ad-36d6fad98853@suse.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260424_014441_155961_AD2586D8 X-CRM114-Status: GOOD ( 26.33 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --3cb63aedvnuis3py Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH v2 15/20] drm/drv: Call drm_mode_config_create_state() by default MIME-Version: 1.0 Hi, On Tue, Apr 21, 2026 at 03:38:16PM +0200, Thomas Zimmermann wrote: > Am 20.03.26 um 17:27 schrieb Maxime Ripard: > > Almost all drivers, and our documented skeleton, call > > drm_mode_config_reset() prior to calling drm_dev_register() to > > initialize its DRM object states. > >=20 > > Now that we have drm_mode_config_create_state() to create that initial > > state if it doesn't exist, we can call it directly in > > drm_dev_register(). That way, we know that the initial atomic state will > > always be allocated without any boilerplate. > >=20 > > Signed-off-by: Maxime Ripard > > --- > > drivers/gpu/drm/drm_drv.c | 4 ++++ > > 1 file changed, 4 insertions(+) > >=20 > > diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c > > index 2915118436ce8a6640cfb0c59936031990727ed1..820106d56ab399a39cac56d= 98662b5ddbcae8ded 100644 > > --- a/drivers/gpu/drm/drm_drv.c > > +++ b/drivers/gpu/drm/drm_drv.c > > @@ -1097,10 +1097,14 @@ int drm_dev_register(struct drm_device *dev, un= signed long flags) > > if (drm_core_check_feature(dev, DRIVER_MODESET)) { > > ret =3D drm_modeset_register_all(dev); > > if (ret) > > goto err_unload; > > + > > + ret =3D drm_mode_config_create_state(dev); > > + if (ret) > > + goto err_unload; >=20 > Way too late. Yeah... I think that was Ville's main objection too. > Lets rather go through drivers and call this where they currently call > drm_mode_config_reset() for initialization. I was really hoping to remove the boilerplate from drivers, but I don't really see a good place for it then. drm_mode_config_init() could be another candidate, but it looks weird to put it there too. I'll drop that then. > This can be a single-patch mass conversion IMHO. I'm not really sure? For it to work we'd need to convert these drivers objects from reset to atomic_create_state too. I absolutely want to do it next, but I don't think it will be as trivial as a sed call, and it would probably be best done by driver to allow reverts if we screw up. Maxime --3cb63aedvnuis3py Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJUEABMJAB0WIQTkHFbLp4ejekA/qfgnX84Zoj2+dgUCaestcwAKCRAnX84Zoj2+ dqD3AX91s5aTyrSIs+zg1NTVZ/3A3vLYBnSfFHi5Qil7rXN1H/JxIEEE9V0Ta7xL sVv2OtMBfAktM0SQa0/hMpYggLwZw3S6EpI61etzjCn+mWT08kRxfRP0K6KBacXD xc3d+CTDBg== =tyOY -----END PGP SIGNATURE----- --3cb63aedvnuis3py--