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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2014-12-10 21:11:31 +0200
committerDave Airlie <airlied@redhat.com>2014-12-11 10:28:41 +1000
commitf41c2581bc2b6b21f774596845952a7cb4c15c74 (patch)
treeecbfd6722709f613c37abd7cc2ccad777a4a17b7 /Documentation/DocBook/drm.tmpl
parentMerge tag 'topic/core-stuff-2014-12-10' of git://anongit.freedesktop.org/drm-intel into drm-next (diff)
downloadlinux-dev-f41c2581bc2b6b21f774596845952a7cb4c15c74.tar.xz
linux-dev-f41c2581bc2b6b21f774596845952a7cb4c15c74.zip
drm/doc: Document drm_add_modes_noedid() usage
And fix a spelling mistake. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'Documentation/DocBook/drm.tmpl')
-rw-r--r--Documentation/DocBook/drm.tmpl24
1 files changed, 19 insertions, 5 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 7a44d9d43c49..4b592ffbafee 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -1947,10 +1947,16 @@ void intel_crt_init(struct drm_device *dev)
and then retrieves a list of modes by calling the connector
<methodname>get_modes</methodname> helper operation.
</para>
+ <para>
+ If the helper operation returns no mode, and if the connector status
+ is connector_status_connected, standard VESA DMT modes up to
+ 1024x768 are automatically added to the modes list by a call to
+ <function>drm_add_modes_noedid</function>.
+ </para>
<para>
- The function filters out modes larger than
+ The function then filters out modes larger than
<parameter>max_width</parameter> and <parameter>max_height</parameter>
- if specified. It then calls the optional connector
+ if specified. It finally calls the optional connector
<methodname>mode_valid</methodname> helper operation for each mode in
the probed list to check whether the mode is valid for the connector.
</para>
@@ -2090,12 +2096,20 @@ void intel_crt_init(struct drm_device *dev)
<synopsis>int (*get_modes)(struct drm_connector *connector);</synopsis>
<para>
Fill the connector's <structfield>probed_modes</structfield> list
- by parsing EDID data with <function>drm_add_edid_modes</function> or
- calling <function>drm_mode_probed_add</function> directly for every
+ by parsing EDID data with <function>drm_add_edid_modes</function>,
+ adding standard VESA DMT modes with <function>drm_add_modes_noedid</function>,
+ or calling <function>drm_mode_probed_add</function> directly for every
supported mode and return the number of modes it has detected. This
operation is mandatory.
</para>
<para>
+ Note that the caller function will automatically add standard VESA
+ DMT modes up to 1024x768 if the <methodname>get_modes</methodname>
+ helper operation returns no mode and if the connector status is
+ connector_status_connected. There is no need to call
+ <function>drm_add_edid_modes</function> manually in that case.
+ </para>
+ <para>
When adding modes manually the driver creates each mode with a call to
<function>drm_mode_create</function> and must fill the following fields.
<itemizedlist>
@@ -2292,7 +2306,7 @@ void intel_crt_init(struct drm_device *dev)
<function>drm_helper_probe_single_connector_modes</function>.
</para>
<para>
- When parsing EDID data, <function>drm_add_edid_modes</function> fill the
+ When parsing EDID data, <function>drm_add_edid_modes</function> fills the
connector <structfield>display_info</structfield>
<structfield>width_mm</structfield> and
<structfield>height_mm</structfield> fields. When creating modes