From: Thomas Zimmermann <tzimmermann@suse.de>
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
Cc: xen-devel@lists.xenproject.org,
Thomas Zimmermann <tzimmermann@suse.de>,
dri-devel@lists.freedesktop.org,
virtualization@lists.linux-foundation.org
Subject: [PATCH v3 1/4] drm: Add drm_crtc_has_vblank()
Date: Mon, 20 Jan 2020 13:20:48 +0100 [thread overview]
Message-ID: <20200120122051.25178-2-tzimmermann@suse.de> (raw)
In-Reply-To: <20200120122051.25178-1-tzimmermann@suse.de>
The new interface drm_crtc_has_vblank() return true if vblanking has
been initialized for a certain CRTC, or false otherwise. This function
will be useful for initializing CRTC state.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/drm_vblank.c | 21 +++++++++++++++++++++
include/drm/drm_vblank.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 1659b13b178c..c20102899411 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -501,6 +501,27 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
}
EXPORT_SYMBOL(drm_vblank_init);
+/**
+ * drm_crtc_has_vblank - test if vblanking has been initialized for
+ * a CRTC
+ * @crtc: the CRTC
+ *
+ * Drivers may call this function to test if vblank support is
+ * initialized for a CRTC. For most hardware this means that vblanking
+ * can also be enabled on the CRTC.
+ *
+ * Returns:
+ * True if vblanking has been initialized for the given CRTC, false
+ * otherwise.
+ */
+bool drm_crtc_has_vblank(const struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+
+ return crtc->index < dev->num_crtcs;
+}
+EXPORT_SYMBOL(drm_crtc_has_vblank);
+
/**
* drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
* @crtc: which CRTC's vblank waitqueue to retrieve
diff --git a/include/drm/drm_vblank.h b/include/drm/drm_vblank.h
index c16c44052b3d..531a6bc12b7e 100644
--- a/include/drm/drm_vblank.h
+++ b/include/drm/drm_vblank.h
@@ -206,6 +206,7 @@ struct drm_vblank_crtc {
};
int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
+bool drm_crtc_has_vblank(const struct drm_crtc *crtc);
u64 drm_crtc_vblank_count(struct drm_crtc *crtc);
u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
ktime_t *vblanktime);
--
2.24.1
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next prev parent reply other threads:[~2020-01-20 12:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-20 12:20 [PATCH v3 0/4] Use no_vblank property for drivers without VBLANK Thomas Zimmermann
2020-01-20 12:20 ` Thomas Zimmermann [this message]
2020-01-22 8:31 ` [PATCH v3 1/4] drm: Add drm_crtc_has_vblank() Daniel Vetter
2020-01-22 8:53 ` Thomas Zimmermann
2020-01-22 9:04 ` Daniel Vetter
2020-01-22 9:42 ` Thomas Zimmermann
2020-01-20 12:20 ` [PATCH v3 2/4] drm: Initialize struct drm_crtc_state.no_vblank from device settings Thomas Zimmermann
2020-01-22 8:47 ` Daniel Vetter
2020-01-20 12:20 ` [PATCH v3 3/4] drm/ast: Don't set struct drm_crtc_state.no_vblank explictly Thomas Zimmermann
2020-01-20 12:20 ` [PATCH v3 4/4] drm/udl: " Thomas Zimmermann
2020-01-21 9:36 ` [PATCH v3 0/4] Use no_vblank property for drivers without VBLANK Gerd Hoffmann
2020-01-23 8:40 ` Thomas Zimmermann
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