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Tue, 21 Apr 2026 13:08:04 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id woxgEbR252nHeQAAD6G6ig (envelope-from ); Tue, 21 Apr 2026 13:08:04 +0000 Message-ID: <8f111841-bb88-4cbb-a3ae-b26ac2f252cb@suse.de> Date: Tue, 21 Apr 2026 15:08:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 03/20] drm/mode-config: Mention drm_mode_config_reset() culprits To: Maxime Ripard , 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?Q?Ma=C3=ADra_Canal?= , Raspberry Pi Kernel Maintenance Cc: 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, Laurent Pinchart References: <20260320-drm-mode-config-init-v2-0-c63f1134e76c@kernel.org> <20260320-drm-mode-config-init-v2-3-c63f1134e76c@kernel.org> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; 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DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:url,suse.de:mid] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260421_060807_356863_535A11B3 X-CRM114-Status: GOOD ( 18.12 ) 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 Hi Am 20.03.26 um 17:27 schrieb Maxime Ripard: > drm_mode_config_reset() does not reset drm_private_states by design. > > This is especially significant for the DP MST and tunneling code that > expect to be preserved across a suspend/resume cycle, where > drm_mode_config_reset() is also used. Do we really? There's drm_mode_config_helper_suspend/resume(). Why would drivers do a drm_mode_config_reset(). Best regards Thomas > > Let's document this expectation. > > Link: https://lore.kernel.org/dri-devel/aOaQLx-7EpsHRwkH@ideak-desk/ > Reviewed-by: Laurent Pinchart > Signed-off-by: Maxime Ripard > --- > drivers/gpu/drm/drm_mode_config.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c > index 66f7dc37b5970c0a08f8dde008aef56376c59f37..cba527571ca66d3aa6dc652c87e03a19815d1d41 100644 > --- a/drivers/gpu/drm/drm_mode_config.c > +++ b/drivers/gpu/drm/drm_mode_config.c > @@ -187,10 +187,14 @@ int drm_mode_getresources(struct drm_device *dev, void *data, > * @dev: drm device > * > * This functions calls all the crtc's, encoder's and connector's ->reset > * callback. Drivers can use this in e.g. their driver load or resume code to > * reset hardware and software state. > + * > + * Note that @drm_private_obj structures are expected to be stable across > + * suspend/resume cycles, and @drm_mode_config_reset() does not affect these > + * structures. > */ > void drm_mode_config_reset(struct drm_device *dev) > { > struct drm_crtc *crtc; > struct drm_colorop *colorop; > -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)