diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DocBook/gpu.tmpl | 117 |
1 files changed, 1 insertions, 116 deletions
diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl index be06c9b8a0a7..0ca010da4bdf 100644 --- a/Documentation/DocBook/gpu.tmpl +++ b/Documentation/DocBook/gpu.tmpl @@ -1174,121 +1174,6 @@ int max_width, max_height;</synopsis> pointer to CRTC functions. </para> </sect3> - <sect3 id="drm-kms-crtcops"> - <title>CRTC Operations</title> - <sect4> - <title>Set Configuration</title> - <synopsis>int (*set_config)(struct drm_mode_set *set);</synopsis> - <para> - Apply a new CRTC configuration to the device. The configuration - specifies a CRTC, a frame buffer to scan out from, a (x,y) position in - the frame buffer, a display mode and an array of connectors to drive - with the CRTC if possible. - </para> - <para> - If the frame buffer specified in the configuration is NULL, the driver - must detach all encoders connected to the CRTC and all connectors - attached to those encoders and disable them. - </para> - <para> - This operation is called with the mode config lock held. - </para> - <note><para> - Note that the drm core has no notion of restoring the mode setting - state after resume, since all resume handling is in the full - responsibility of the driver. The common mode setting helper library - though provides a helper which can be used for this: - <function>drm_helper_resume_force_mode</function>. - </para></note> - </sect4> - <sect4> - <title>Page Flipping</title> - <synopsis>int (*page_flip)(struct drm_crtc *crtc, struct drm_framebuffer *fb, - struct drm_pending_vblank_event *event);</synopsis> - <para> - Schedule a page flip to the given frame buffer for the CRTC. This - operation is called with the mode config mutex held. - </para> - <para> - Page flipping is a synchronization mechanism that replaces the frame - buffer being scanned out by the CRTC with a new frame buffer during - vertical blanking, avoiding tearing. When an application requests a page - flip the DRM core verifies that the new frame buffer is large enough to - be scanned out by the CRTC in the currently configured mode and then - calls the CRTC <methodname>page_flip</methodname> operation with a - pointer to the new frame buffer. - </para> - <para> - The <methodname>page_flip</methodname> operation schedules a page flip. - Once any pending rendering targeting the new frame buffer has - completed, the CRTC will be reprogrammed to display that frame buffer - after the next vertical refresh. The operation must return immediately - without waiting for rendering or page flip to complete and must block - any new rendering to the frame buffer until the page flip completes. - </para> - <para> - If a page flip can be successfully scheduled the driver must set the - <code>drm_crtc->fb</code> field to the new framebuffer pointed to - by <code>fb</code>. This is important so that the reference counting - on framebuffers stays balanced. - </para> - <para> - If a page flip is already pending, the - <methodname>page_flip</methodname> operation must return - -<errorname>EBUSY</errorname>. - </para> - <para> - To synchronize page flip to vertical blanking the driver will likely - need to enable vertical blanking interrupts. It should call - <function>drm_vblank_get</function> for that purpose, and call - <function>drm_vblank_put</function> after the page flip completes. - </para> - <para> - If the application has requested to be notified when page flip completes - the <methodname>page_flip</methodname> operation will be called with a - non-NULL <parameter>event</parameter> argument pointing to a - <structname>drm_pending_vblank_event</structname> instance. Upon page - flip completion the driver must call <methodname>drm_send_vblank_event</methodname> - to fill in the event and send to wake up any waiting processes. - This can be performed with - <programlisting><![CDATA[ - spin_lock_irqsave(&dev->event_lock, flags); - ... - drm_send_vblank_event(dev, pipe, event); - spin_unlock_irqrestore(&dev->event_lock, flags); - ]]></programlisting> - </para> - <note><para> - FIXME: Could drivers that don't need to wait for rendering to complete - just add the event to <literal>dev->vblank_event_list</literal> and - let the DRM core handle everything, as for "normal" vertical blanking - events? - </para></note> - <para> - While waiting for the page flip to complete, the - <literal>event->base.link</literal> list head can be used freely by - the driver to store the pending event in a driver-specific list. - </para> - <para> - If the file handle is closed before the event is signaled, drivers must - take care to destroy the event in their - <methodname>preclose</methodname> operation (and, if needed, call - <function>drm_vblank_put</function>). - </para> - </sect4> - <sect4> - <title>Miscellaneous</title> - <itemizedlist> - <listitem> - <synopsis>void (*gamma_set)(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b, - uint32_t start, uint32_t size);</synopsis> - <para> - Apply a gamma table to the device. The operation is optional. - </para> - </listitem> - </itemizedlist> - </sect4> - </sect3> </sect2> <sect2> <title>Planes (struct <structname>drm_plane</structname>)</title> @@ -1305,7 +1190,7 @@ int max_width, max_height;</synopsis> <listitem> DRM_PLANE_TYPE_PRIMARY represents a "main" plane for a CRTC. Primary planes are the planes operated upon by CRTC modesetting and flipping - operations described in <xref linkend="drm-kms-crtcops"/>. + operations described in the page_flip hook in <structname>drm_crtc_funcs</structname>. </listitem> <listitem> DRM_PLANE_TYPE_CURSOR represents a "cursor" plane for a CRTC. Cursor |