backends/drm: support the panel orientation property

src/backends/drm/drm_connector.cpp

@@ -112,7 +112,8 @@ DrmConnector::DrmConnector(DrmGpu *gpu, uint32_t connectorId)
                  PropertyDefinition(QByteArrayLiteral("link-status"), Requirement::Optional,
                                     {QByteArrayLiteral("Good"), QByteArrayLiteral("Bad")}),
                  PropertyDefinition(QByteArrayLiteral("content type"), Requirement::Optional,
-                                    {QByteArrayLiteral("No Data"), QByteArrayLiteral("Graphics"), QByteArrayLiteral("Photo"), QByteArrayLiteral("Cinema"), QByteArrayLiteral("Game")})},
+                                    {QByteArrayLiteral("No Data"), QByteArrayLiteral("Graphics"), QByteArrayLiteral("Photo"), QByteArrayLiteral("Cinema"), QByteArrayLiteral("Game")}),
+                 PropertyDefinition(QByteArrayLiteral("panel orientation"), Requirement::Optional, {QByteArrayLiteral("Normal"), QByteArrayLiteral("Upside Down"), QByteArrayLiteral("Left Side Up"), QByteArrayLiteral("Right Side Up")})},
                 DRM_MODE_OBJECT_CONNECTOR)
     , m_pipeline(std::make_unique<DrmPipeline>(this))
     , m_conn(drmModeGetConnector(gpu->fd(), connectorId))
@@ -447,6 +448,15 @@ std::shared_ptr<DrmConnectorMode> DrmConnector::generateMode(const QSize &size,
     return std::make_shared<DrmConnectorMode>(this, mode);
 }
 
+DrmConnector::PanelOrientation DrmConnector::panelOrientation() const
+{
+    if (const auto &property = getProp(PropertyIndex::PanelOrientation)) {
+        return property->enumForValue<PanelOrientation>(property->current());
+    } else {
+        return PanelOrientation::Normal;
+    }
+}
+
 QDebug &operator<<(QDebug &s, const KWin::DrmConnector *obj)
 {
     QDebugStateSaver saver(s);
@@ -482,4 +492,20 @@ DrmConnector::DrmContentType DrmConnector::kwinToDrmContentType(ContentType type
         Q_UNREACHABLE();
     }
 }
+
+Output::Transform DrmConnector::toKWinTransform(PanelOrientation orientation)
+{
+    switch (orientation) {
+    case PanelOrientation::Normal:
+        return KWin::Output::Transform::Normal;
+    case PanelOrientation::RightUp:
+        return KWin::Output::Transform::Rotated270;
+    case PanelOrientation::LeftUp:
+        return KWin::Output::Transform::Rotated90;
+    case PanelOrientation::UpsideDown:
+        return KWin::Output::Transform::Rotated180;
+    default:
+        Q_UNREACHABLE();
+    }
+}
 }

src/backends/drm/drm_connector.h

@@ -65,6 +65,7 @@ public:
         MaxBpc = 10,
         LinkStatus = 11,
         ContentType = 12,
+        PanelOrientation = 13,
         Count
     };
 
@@ -84,6 +85,12 @@ public:
         Cinema = 3,
         Game = 4
     };
+    enum class PanelOrientation : uint32_t {
+        Normal = 0,
+        UpsideDown = 1,
+        LeftUp = 2,
+        RightUp = 3
+    };
 
     bool init() override;
     bool updateProperties() override;
@@ -110,8 +117,10 @@ public:
     bool hasRgbRange() const;
     Output::RgbRange rgbRange() const;
     LinkStatus linkStatus() const;
+    PanelOrientation panelOrientation() const;
 
     static DrmContentType kwinToDrmContentType(ContentType type);
+    static Output::Transform toKWinTransform(PanelOrientation orientation);
 
 private:
     QList<std::shared_ptr<DrmConnectorMode>> generateCommonModes();

src/backends/drm/drm_output.cpp

@@ -76,6 +76,7 @@ DrmOutput::DrmOutput(DrmPipeline *pipeline)
         .edid = edid->raw(),
         .subPixel = conn->subpixel(),
         .capabilities = capabilities,
+        .panelOrientation = DrmConnector::toKWinTransform(conn->panelOrientation()),
         .internal = conn->isInternal(),
         .nonDesktop = conn->isNonDesktop(),
     });

src/core/output.cpp

@@ -406,4 +406,9 @@ void Output::setContentType(ContentType contentType)
     m_contentType = contentType;
 }
 
+Output::Transform Output::panelOrientation() const
+{
+    return m_information.panelOrientation;
+}
+
 } // namespace KWin

src/core/output.h

@@ -248,6 +248,7 @@ public:
 
     bool isPlaceholder() const;
     bool isNonDesktop() const;
+    Transform panelOrientation() const;
 
     virtual void setColorTransformation(const std::shared_ptr<ColorTransformation> &transformation);
 
@@ -317,6 +318,7 @@ protected:
         QByteArray edid;
         SubPixel subPixel = SubPixel::Unknown;
         Capabilities capabilities;
+        Transform panelOrientation = Transform::Normal;
         bool internal = false;
         bool placeholder = false;
         bool nonDesktop = false;

src/workspace.cpp

@@ -675,7 +675,7 @@ void Workspace::updateOutputConfiguration()
         } else {
             props->enabled = true;
             props->pos = pos;
-            props->transform = Output::Transform::Normal;
+            props->transform = output->panelOrientation();
         }
         pos.setX(pos.x() + output->geometry().width());
     }