From nobody Tue Nov 11 02:12:59 2025 Delivered-To: importer@patchew.org Received-SPF: none (zohomail.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; spf=none (zohomail.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1580299598068577.4251934074614; Wed, 29 Jan 2020 04:06:38 -0800 (PST) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1iwm6o-0005zT-Ba; Wed, 29 Jan 2020 12:06:14 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1iwm6m-0005ws-5G for xen-devel@lists.xenproject.org; Wed, 29 Jan 2020 12:06:12 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id aba1f11c-428f-11ea-889e-12813bfff9fa; Wed, 29 Jan 2020 12:05:42 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 3B79FB1F1; Wed, 29 Jan 2020 12:05:41 +0000 (UTC) X-Inumbo-ID: aba1f11c-428f-11ea-889e-12813bfff9fa X-Virus-Scanned: by amavisd-new at test-mx.suse.de From: Thomas Zimmermann To: airlied@linux.ie, daniel@ffwll.ch, kraxel@redhat.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, hdegoede@redhat.com, david@lechnology.com, noralf@tronnes.org, sean@poorly.run, oleksandr_andrushchenko@epam.com, sam@ravnborg.org, laurent.pinchart@ideasonboard.com, emil.velikov@collabora.com Date: Wed, 29 Jan 2020 13:05:31 +0100 Message-Id: <20200129120531.6891-16-tzimmermann@suse.de> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200129120531.6891-1-tzimmermann@suse.de> References: <20200129120531.6891-1-tzimmermann@suse.de> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v5 15/15] drm/xen: Explicitly disable automatic sending of vblank event X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , xen-devel@lists.xenproject.org, Thomas Zimmermann , dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" The atomic helpers automatically send out fake VBLANK events if no vblanking has been initialized. This would apply to xen, but xen has its own vblank logic. To avoid interfering with the atomic helpers, disable automatic vblank events explicitly. v5: * update comment v4: * separate commit from core vblank changes Signed-off-by: Thomas Zimmermann Acked-by: Gerd Hoffmann Reviewed-by: Daniel Vetter --- drivers/gpu/drm/xen/xen_drm_front_kms.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/gpu/drm/xen/xen_drm_front_kms.c b/drivers/gpu/drm/xen/= xen_drm_front_kms.c index 4f34c5208180..78096bbcd226 100644 --- a/drivers/gpu/drm/xen/xen_drm_front_kms.c +++ b/drivers/gpu/drm/xen/xen_drm_front_kms.c @@ -220,6 +220,24 @@ static bool display_send_page_flip(struct drm_simple_d= isplay_pipe *pipe, return false; } =20 +static int display_check(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *plane_state, + struct drm_crtc_state *crtc_state) +{ + /* + * Xen doesn't initialize vblanking via drm_vblank_init(), so + * DRM helpers assume that it doesn't handle vblanking and start + * sending out fake VBLANK events automatically. + * + * As xen contains it's own logic for sending out VBLANK events + * in send_pending_event(), disable no_vblank (i.e., the xen + * driver has vblanking support). + */ + crtc_state->no_vblank =3D false; + + return 0; +} + static void display_update(struct drm_simple_display_pipe *pipe, struct drm_plane_state *old_plane_state) { @@ -284,6 +302,7 @@ static const struct drm_simple_display_pipe_funcs displ= ay_funcs =3D { .enable =3D display_enable, .disable =3D display_disable, .prepare_fb =3D drm_gem_fb_simple_display_pipe_prepare_fb, + .check =3D display_check, .update =3D display_update, }; =20 --=20 2.25.0 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel