From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Clark Subject: [RFCv3 04/14] drm: add DRM_MODE_PROP_DYNAMIC property flag Date: Wed, 20 Nov 2013 15:48:03 -0500 Message-ID: <1384980493-25499-5-git-send-email-robdclark@gmail.com> References: <1384980493-25499-1-git-send-email-robdclark@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-qc0-f180.google.com (mail-qc0-f180.google.com [209.85.216.180]) by gabe.freedesktop.org (Postfix) with ESMTP id F24201059C6 for ; Wed, 20 Nov 2013 12:48:33 -0800 (PST) Received: by mail-qc0-f180.google.com with SMTP id e16so4293154qcx.39 for ; Wed, 20 Nov 2013 12:48:33 -0800 (PST) In-Reply-To: <1384980493-25499-1-git-send-email-robdclark@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org This indicates to userspace that the property is something that can be set dynamically without requiring a "test" step to check if the hw is capable. This allows a userspace compositor, such as weston, to avoid an extra ioctl to check whether it needs to fall-back to GPU to composite some surface prior to submission of GPU render commands. --- include/uapi/drm/drm_mode.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 73cfd1e..536897a 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -251,6 +251,15 @@ struct drm_mode_get_connector { #define DRM_MODE_PROP_BLOB (1<<4) #define DRM_MODE_PROP_BITMASK (1<<5) /* bitmask of enumerated types */ #define DRM_MODE_PROP_OBJECT (1<<6) /* drm mode object */ +/* Properties that are not dynamic cannot safely be changed without a + * atomic-modeset / atomic-pageflip test step. But if userspace is + * only changing dynamic properties, it is guaranteed that the change + * will not exceed hw limits, so no test step is required. + * + * Note that fb_id properties are a bit ambiguous.. they of course can + * be changed dynamically, assuming the pixel format does not change. + */ +#define DRM_MODE_PROP_DYNAMIC (1<<24) struct drm_mode_property_enum { __u64 value; -- 1.8.4.2