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kmssink: Add "restore-crtc" property

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This adds "restore-crtc" property using which one
can restore previous crtc mode.

By default it is enabled, if CRTC was already
active with a valid mode and kmssink set a new mode
on CRTC using force-modesetting.

This helps user restore previous crtc mode and get
the previous session back after running a kmssink
pipeline involving a force-modesetting.

For e.g. When running a kmssink pipeline on rpi
using force-modesetting on tty console, it was giving
a blank screen after pipeline, and now with help of restore-crtc
functionality, CRTC is set with previous crtc mode
previously active on tty console.

Edited-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>

https://bugzilla.gnome.org/show_bug.cgi?id=797025
This commit is contained in:
Devarsh Thakkar 2018-08-25 22:47:34 +05:30 committed by Nicolas Dufresne
parent 531709e5bf
commit 7d79378895
2 changed files with 41 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

40
sys/kms/gstkmssink.c
View file

@ -90,6 +90,7 @@ enum
PROP_CONNECTOR_ID,
PROP_PLANE_ID,
PROP_FORCE_MODESETTING,
PROP_RESTORE_CRTC,
PROP_CAN_SCALE,
PROP_DISPLAY_WIDTH,
PROP_DISPLAY_HEIGHT,
@ -740,6 +741,10 @@ gst_kms_sink_start (GstBaseSink * bsink)
universal_planes = TRUE;
}
if (crtc->mode_valid && self->modesetting_enabled && self->restore_crtc) {
self->saved_crtc = (drmModeCrtc *) crtc;
}
retry_find_plane:
if (universal_planes &&
drmSetClientCap (self->fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1))
@ -805,7 +810,7 @@ bail:
drmModeFreePlane (plane);
if (pres)
drmModeFreePlaneResources (pres);
if (crtc)
if (crtc != self->saved_crtc)
drmModeFreeCrtc (crtc);
if (conn)
drmModeFreeConnector (conn);
@ -890,6 +895,7 @@ static gboolean
gst_kms_sink_stop (GstBaseSink * bsink)
{
GstKMSSink *self;
int err;
self = GST_KMS_SINK (bsink);
@ -905,6 +911,19 @@ gst_kms_sink_stop (GstBaseSink * bsink)
gst_poll_restart (self->poll);
gst_poll_fd_init (&self->pollfd);
if (self->saved_crtc) {
drmModeCrtc *crtc = (drmModeCrtc *) self->saved_crtc;
err = drmModeSetCrtc (self->fd, crtc->crtc_id, crtc->buffer_id, crtc->x,
crtc->y, (uint32_t *) & self->conn_id, 1, &crtc->mode);
if (err)
GST_ERROR_OBJECT (self, "Failed to restore previous CRTC mode: %s",
g_strerror (errno));
drmModeFreeCrtc (crtc);
self->saved_crtc = NULL;
}
if (self->fd >= 0) {
drmClose (self->fd);
self->fd = -1;
@ -1723,6 +1742,9 @@ gst_kms_sink_set_property (GObject * object, guint prop_id,
case PROP_FORCE_MODESETTING:
sink->modesetting_enabled = g_value_get_boolean (value);
break;
case PROP_RESTORE_CRTC:
sink->restore_crtc = g_value_get_boolean (value);
break;
case PROP_CAN_SCALE:
sink->can_scale = g_value_get_boolean (value);
break;
@ -1777,6 +1799,9 @@ gst_kms_sink_get_property (GObject * object, guint prop_id,
case PROP_FORCE_MODESETTING:
g_value_set_boolean (value, sink->modesetting_enabled);
break;
case PROP_RESTORE_CRTC:
g_value_set_boolean (value, sink->restore_crtc);
break;
case PROP_CAN_SCALE:
g_value_set_boolean (value, sink->can_scale);
break;
@ -1920,6 +1945,19 @@ gst_kms_sink_class_init (GstKMSSinkClass * klass)
"When enabled, the sink try to configure the display mode", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT);
/**
* kmssink:restore-crtc:
*
* Restore previous CRTC setting if new CRTC mode was set forcefully.
* By default this is enabled if user set CRTC with a new mode on an already
* active CRTC wich was having a valid mode.
*/
g_properties[PROP_RESTORE_CRTC] =
g_param_spec_boolean ("restore-crtc", "Restore CRTC mode",
"When enabled and CRTC was set with a new mode, previous CRTC mode will"
"be restored when going to NULL state.", TRUE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT);
/**
* kmssink:can-scale:
*

3
sys/kms/gstkmssink.h
View file

@ -65,6 +65,7 @@ struct _GstKMSSink {
gboolean can_scale;
gboolean modesetting_enabled;
gboolean restore_crtc;
GstStructure *connector_props;
GstStructure *plane_props;
@ -79,7 +80,7 @@ struct _GstKMSSink {
gchar *bus_id;
guint32 mm_width, mm_height;
gpointer saved_crtc;
GstPoll *poll;
GstPollFD pollfd;