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Tue, 26 May 2026 09:05:19 +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 xO2qAk9iFWrmaQAAD6G6ig (envelope-from ); Tue, 26 May 2026 09:05:19 +0000 Message-ID: Date: Tue, 26 May 2026 11:05:18 +0200 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 05/19] drm/mode-config: Document drm_private_obj exclusion from drm_mode_config_reset() 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: <20260519-drm-mode-config-init-v5-0-388b03321e38@kernel.org> <20260519-drm-mode-config-init-v5-5-388b03321e38@kernel.org> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; 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DBL_BLOCKED_OPENRESOLVER(0.00)[ideasonboard.com:email,suse.de:email,suse.de:mid,imap1.dmz-prg2.suse.org:helo,suse.com:url] X-Spam-Level: X-Spam-Flag: NO Am 19.05.26 um 11:01 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. > > Document this expectation. > > Link: https://lore.kernel.org/dri-devel/aOaQLx-7EpsHRwkH@ideak-desk/ > Reviewed-by: Laurent Pinchart > Signed-off-by: Maxime Ripard Reviewed-by: Thomas Zimmermann > --- > 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 66f7dc37b597..c33382a38191 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)