eglfs_kms: Implement DPMS mode

Implement the new QPlatformScreen API for power state.

[ChangeLog][QPA][eglfs][kms] Allow to set DPMS mode and get the current
value for each screen.

Change-Id: I5abfb53c3e2f6579a2d6ff19d780b67f424903bf
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsdevice.cpp

@@ -283,7 +283,8 @@ QEglFSKmsScreen *QEglFSKmsDevice::screenForConnector(drmModeResPtr resources, dr
         selected_mode,
         false,
         drmModeGetCrtc(m_dri_fd, crtc_id),
-        modes
+        modes,
+        connectorProperty(connector, QByteArrayLiteral("DPMS"))
     };
 
     m_crtc_allocator |= (1 << output.crtc_id);
@@ -292,6 +293,22 @@ QEglFSKmsScreen *QEglFSKmsDevice::screenForConnector(drmModeResPtr resources, dr
     return new QEglFSKmsScreen(m_integration, this, output, pos);
 }
 
+drmModePropertyPtr QEglFSKmsDevice::connectorProperty(drmModeConnectorPtr connector, const QByteArray &name)
+{
+    drmModePropertyPtr prop;
+
+    for (int i = 0; i < connector->count_props; i++) {
+        prop = drmModeGetProperty(m_dri_fd, connector->props[i]);
+        if (!prop)
+            continue;
+        if (strcmp(prop->name, name.constData()) == 0)
+            return prop;
+        drmModeFreeProperty(prop);
+    }
+
+    return Q_NULLPTR;
+}
+
 void QEglFSKmsDevice::pageFlipHandler(int fd, unsigned int sequence, unsigned int tv_sec, unsigned int tv_usec, void *user_data)
 {
     Q_UNUSED(fd);

src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsdevice.h

@@ -78,6 +78,7 @@ private:
 
     int crtcForConnector(drmModeResPtr resources, drmModeConnectorPtr connector);
     QEglFSKmsScreen *screenForConnector(drmModeResPtr resources, drmModeConnectorPtr connector, QPoint pos);
+    drmModePropertyPtr connectorProperty(drmModeConnectorPtr connector, const QByteArray &name);
 
     static void pageFlipHandler(int fd,
                                 unsigned int sequence,

src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsscreen.cpp

@@ -119,6 +119,7 @@ QEglFSKmsScreen::QEglFSKmsScreen(QEglFSKmsIntegration *integration,
     , m_output(output)
     , m_pos(position)
     , m_cursor(Q_NULLPTR)
+    , m_powerState(PowerStateOn)
     , m_interruptHandler(new QEglFSKmsInterruptHandler(this))
 {
     m_siblings << this;
@@ -126,6 +127,10 @@ QEglFSKmsScreen::QEglFSKmsScreen(QEglFSKmsIntegration *integration,
 
 QEglFSKmsScreen::~QEglFSKmsScreen()
 {
+    if (m_output.dpms_prop) {
+        drmModeFreeProperty(m_output.dpms_prop);
+        m_output.dpms_prop = Q_NULLPTR;
+    }
     restoreMode();
     if (m_output.saved_crtc) {
         drmModeFreeCrtc(m_output.saved_crtc);
@@ -266,10 +271,12 @@ void QEglFSKmsScreen::flip()
                                  &m_output.connector_id, 1,
                                  &m_output.modes[m_output.mode]);
 
-        if (ret)
+        if (ret) {
             qErrnoWarning("Could not set DRM mode!");
-        else
+        } else {
             m_output.mode_set = true;
+            setPowerState(PowerStateOn);
+        }
     }
 
     int ret = drmModePageFlip(m_device->fd(),
@@ -314,4 +321,19 @@ qreal QEglFSKmsScreen::refreshRate() const
     return refresh > 0 ? refresh : 60;
 }
 
+QPlatformScreen::PowerState QEglFSKmsScreen::powerState() const
+{
+    return m_powerState;
+}
+
+void QEglFSKmsScreen::setPowerState(QPlatformScreen::PowerState state)
+{
+    if (!m_output.dpms_prop)
+        return;
+
+    drmModeConnectorSetProperty(m_device->fd(), m_output.connector_id,
+                                m_output.dpms_prop->prop_id, (int)state);
+    m_powerState = state;
+}
+
 QT_END_NAMESPACE

src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsscreen.h

@@ -60,6 +60,7 @@ struct QEglFSKmsOutput
     bool mode_set;
     drmModeCrtcPtr saved_crtc;
     QList<drmModeModeInfo> modes;
+    drmModePropertyPtr dpms_prop;
 };
 
 class QEglFSKmsScreen : public QEglFSScreen
@@ -103,6 +104,9 @@ public:
     QEglFSKmsOutput &output() { return m_output; }
     void restoreMode();
 
+    QPlatformScreen::PowerState powerState() const Q_DECL_OVERRIDE;
+    void setPowerState(QPlatformScreen::PowerState state) Q_DECL_OVERRIDE;
+
 private:
     QEglFSKmsIntegration *m_integration;
     QEglFSKmsDevice *m_device;
@@ -117,6 +121,8 @@ private:
 
     QList<QPlatformScreen *> m_siblings;
 
+    PowerState m_powerState;
+
     struct FrameBuffer {
         FrameBuffer() : fb(0) {}
         uint32_t fb;