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Mon, 10 Nov 2025 09:57:54 +0000 Message-ID: <29b1cc39-7868-4b15-bac6-7dc97869dbdb@suse.de> Date: Mon, 10 Nov 2025 10:57:53 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/6] drm/atomic: use drm_crtc_vblank_waitqueue() To: Jani Nikula , dri-devel@lists.freedesktop.org Cc: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, ville.syrjala@linux.intel.com References: <1097348197acea9110da8baebbbc189890d01660.1762513240.git.jani.nikula@intel.com> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNJ1Rob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmRlPsLAjgQTAQgAOAIb AwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftODH AAoJEGgNwR1TC3ojx1wH/0hKGWugiqDgLNXLRD/4TfHBEKmxIrmfu9Z5t7vwUKfwhFL6hqvo lXPJJKQpQ2z8+X2vZm/slsLn7J1yjrOsoJhKABDi+3QWWSGkaGwRJAdPVVyJMfJRNNNIKwVb U6B1BkX2XDKDGffF4TxlOpSQzdtNI/9gleOoUA8+jy8knnDYzjBNOZqLG2FuTdicBXblz0Mf vg41gd9kCwYXDnD91rJU8tzylXv03E75NCaTxTM+FBXPmsAVYQ4GYhhgFt8S2UWMoaaABLDe 7l5FdnLdDEcbmd8uLU2CaG4W2cLrUaI4jz2XbkcPQkqTQ3EB67hYkjiEE6Zy3ggOitiQGcqp j//OwE0EWznS4AEIAMYmP4M/V+T5RY5at/g7rUdNsLhWv1APYrh9RQefODYHrNRHUE9eosYb T6XMryR9hT8XlGOYRwKWwiQBoWSDiTMo/Xi29jUnn4BXfI2px2DTXwc22LKtLAgTRjP+qbU6 3Y0xnQN29UGDbYgyyK51DW3H0If2a3JNsheAAK+Xc9baj0LGIc8T9uiEWHBnCH+RdhgATnWW GKdDegUR5BkDfDg5O/FISymJBHx2Dyoklv5g4BzkgqTqwmaYzsl8UxZKvbaxq0zbehDda8lv hFXodNFMAgTLJlLuDYOGLK2AwbrS3Sp0AEbkpdJBb44qVlGm5bApZouHeJ/+n+7r12+lqdsA EQEAAcLAdgQYAQgAIAIbDBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftOH6AAoJEGgNwR1T C3ojVSkIALpAPkIJPQoURPb1VWjh34l0HlglmYHvZszJWTXYwavHR8+k6Baa6H7ufXNQtThR yIxJrQLW6rV5lm7TjhffEhxVCn37+cg0zZ3j7zIsSS0rx/aMwi6VhFJA5hfn3T0TtrijKP4A SAQO9xD1Zk9/61JWk8OysuIh7MXkl0fxbRKWE93XeQBhIJHQfnc+YBLprdnxR446Sh8Wn/2D Ya8cavuWf2zrB6cZurs048xe0UbSW5AOSo4V9M0jzYI4nZqTmPxYyXbm30Kvmz0rYVRaitYJ 4kyYYMhuULvrJDMjZRvaNe52tkKAvMevcGdt38H4KSVXAylqyQOW5zvPc4/sq9c= In-Reply-To: <1097348197acea9110da8baebbbc189890d01660.1762513240.git.jani.nikula@intel.com> Content-Type: text/plain; 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DBL_BLOCKED_OPENRESOLVER(0.00)[intel.com:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,bootlin.com:url,suse.de:dkim,suse.de:mid,suse.de:email,suse.com:url]; URIBL_BLOCKED(0.00)[intel.com:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.de:dkim,suse.de:mid,suse.de:email,suse.com:url,bootlin.com:url]; DKIM_TRACE(0.00)[suse.de:+] X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Hi Am 07.11.25 um 12:04 schrieb Jani Nikula: > We have drm_crtc_vblank_waitqueue() to get the wait_queue_head_t pointer > for a vblank. Use it instead of poking at dev->vblank[] directly. > > Due to the macro maze of wait_event_timeout() that uses the address-of > operator on the argument, we have to pass it in with the indirection > operator. > > Signed-off-by: Jani Nikula Reviewed-by Thomas Zimmermann But... drm_crtc_vblank_waitqueue() is a terrible interface IMHO, as it exports internal details of the vblank implementation. I wonder if the existing users at [1] and [2] couldn't be replaced with a common vblank helper. And there's drm_wait_one_vblank() [3] and the waiting that's being fixed here [4]. The latter looks like [3] but with multiple CRTC waiting for their next vblank. I'd say this could be a single implementation within the vblank code. [1] https://elixir.bootlin.com/linux/v6.18-rc4/source/drivers/gpu/drm/i915/display/intel_display_rps.c#L73 [2] https://elixir.bootlin.com/linux/v6.18-rc4/source/drivers/gpu/drm/i915/display/intel_vblank.c#L715 [3] https://elixir.bootlin.com/linux/v6.18-rc4/source/drivers/gpu/drm/drm_vblank.c#L1304 [4] https://elixir.bootlin.com/linux/v6.18-rc4/source/drivers/gpu/drm/drm_atomic_helper.c#L1837 Best regards Thomas > --- > drivers/gpu/drm/drm_atomic_helper.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c > index 5a473a274ff0..e641fcf8c568 100644 > --- a/drivers/gpu/drm/drm_atomic_helper.c > +++ b/drivers/gpu/drm/drm_atomic_helper.c > @@ -1831,10 +1831,12 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev, > } > > for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) { > + wait_queue_head_t *queue = drm_crtc_vblank_waitqueue(crtc); > + > if (!(crtc_mask & drm_crtc_mask(crtc))) > continue; > > - ret = wait_event_timeout(dev->vblank[i].queue, > + ret = wait_event_timeout(*queue, > state->crtcs[i].last_vblank_count != > drm_crtc_vblank_count(crtc), > msecs_to_jiffies(100)); -- -- 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)