drm: atomically disable CRTCs
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parent
5c6ab5a730
commit
fc31fcf359
1 changed files with 21 additions and 11 deletions
32
src/drm.cpp
32
src/drm.cpp
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@ -454,8 +454,6 @@ static const drmModeModeInfo *get_matching_mode( const drmModeConnector *connect
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int init_drm(struct drm_t *drm, const char *device)
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{
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int ret;
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if (device) {
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drm->fd = open(device, O_RDWR | O_CLOEXEC);
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if (!drmIsKMS(drm->fd)) {
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@ -550,14 +548,6 @@ int init_drm(struct drm_t *drm, const char *device)
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}
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}
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// Disable all CRTCs. This ensures the CRTC we've selected isn't being used
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// by another connector.
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for (size_t i = 0; i < drm->crtcs.size(); i++) {
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ret = drmModeSetCrtc(drm->fd, drm->crtcs[i].id, 0, 0, 0, nullptr, 0, nullptr);
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if (ret != 0)
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fprintf(stderr, "failed to disable CRTC %" PRIu32 ": %s", drm->crtcs[i].id, strerror(-ret));
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}
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// Fetch formats which can be scanned out
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for (size_t i = 0; i < drm->planes.size(); i++) {
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struct plane *plane = &drm->planes[i];
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@ -1026,12 +1016,32 @@ bool drm_prepare( struct drm_t *drm, const struct Composite_t *pComposite, const
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if ( drm->pending.mode_id != drm->mode_id ) {
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flags |= DRM_MODE_ATOMIC_ALLOW_MODESET;
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// Disable all connectors and CRTCs
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for ( size_t i = 0; i < drm->connectors.size(); i++ ) {
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if ( add_connector_property( drm, drm->req, &drm->connectors[i], "CRTC_ID", 0 ) < 0 )
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return false;
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}
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for ( size_t i = 0; i < drm->crtcs.size(); i++ ) {
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// We can't disable a CRTC if it's already disabled, or else the
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// kernel will error out with "requesting event but off".
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// TODO: use current prop value, required for output switching support
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if (drm->crtcs[i].initial_prop_values["ACTIVE"] == 0)
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continue;
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if (add_crtc_property(drm, drm->req, &drm->crtcs[i], "MODE_ID", 0) < 0)
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return false;
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if (add_crtc_property(drm, drm->req, &drm->crtcs[i], "ACTIVE", 0) < 0)
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return false;
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}
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// Then enable the ones we've picked
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if (add_connector_property(drm, drm->req, drm->connector, "CRTC_ID", drm->crtc->id) < 0)
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return false;
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if (add_crtc_property(drm, drm->req, drm->crtc, "MODE_ID", drm->pending.mode_id) < 0)
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return false;
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if (add_crtc_property(drm, drm->req, drm->crtc, "ACTIVE", 1) < 0)
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return false;
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}
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