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compositor-drm: get current mode on head discovery

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The inherited mode is the video mode on the connector when we have not
yet reconfigured the connector, if set.

Get the inherited mode the moment we create a drm_head, not when we
determine the mode for a drm_output. This way we are sure to read all
inherited modes before we reconfigure a single CRTC. Enabling one output
may grab the CRTC from another connector, overwriting whatever mode that
connector might have had.

The inherited mode is stored in drm_head, where we can keep it for the
lifetime of the head, rather than relying on re-loading it from the
kernel at set_mode() time.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Acked-by: Derek Foreman <derekf@osg.samsung.com>
This commit is contained in:
Pekka Paalanen 2017-09-11 14:06:11 +03:00
parent f857046559
commit 13d233edba
1 changed files with 11 additions and 5 deletions
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16
libweston/compositor-drm.c
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@ -416,6 +416,8 @@ struct drm_head {
struct drm_property_info props_conn[WDRM_CONNECTOR__COUNT];
struct backlight *backlight;
drmModeModeInfo inherited_mode; /**< Original mode on the connector */
};
struct drm_output {
@ -4560,12 +4562,9 @@ drm_output_set_mode(struct weston_output *base,
struct drm_head *head = to_drm_head(weston_output_get_first_head(base));
struct drm_mode *current;
drmModeModeInfo crtc_mode;
if (connector_get_current_mode(head->connector, b->drm.fd, &crtc_mode) < 0)
return -1;
current = drm_output_choose_initial_mode(b, output, mode, modeline, &crtc_mode);
current = drm_output_choose_initial_mode(b, output, mode, modeline,
&head->inherited_mode);
if (!current)
return -1;
@ -5079,6 +5078,13 @@ drm_head_create(struct drm_backend *backend, uint32_t connector_id,
head->connector->connector_type == DRM_MODE_CONNECTOR_eDP)
weston_head_set_internal(&head->base);
if (connector_get_current_mode(head->connector, backend->drm.fd,
&head->inherited_mode) < 0) {
weston_log("Failed to retrieve current mode from connector %d.\n",
head->connector_id);
/* Continue, inherited_mode was memset to zero. */
}
weston_compositor_add_head(backend->compositor, &head->base);
weston_log("DRM: found head '%s', connector %d %s.\n",