From 093a62a69ad530cb3ffefafbcff9ea28ed3dd134 Mon Sep 17 00:00:00 2001
From: Elvis Lee <kwangwoong.lee@lge.com>
Date: Wed, 29 Sep 2021 11:19:11 +0900
Subject: [PATCH] Support to get timing from pagefilp

Handle the timing from drmEvent when page flip finished.
The information can be used to optimize rendering timing.

Change-Id: I14612ca48a8fea5208aa74949d7543787e860c5f
Reviewed-by: Elvis Lee <kwangwoong.lee@lge.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
---
 .../eglfs_kms_support/qeglfskmseventreader.cpp           | 7 ++++---
 .../eglfs_kms_support/qeglfskmsscreen.cpp                | 9 +++++++++
 .../eglfs_kms_support/qeglfskmsscreen_p.h                | 1 +
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmseventreader.cpp b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmseventreader.cpp
index 67606f895f..a3ac9205a9 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmseventreader.cpp
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmseventreader.cpp
@@ -39,6 +39,7 @@
 
 #include "qeglfskmseventreader_p.h"
 #include "qeglfskmsdevice_p.h"
+#include "qeglfskmsscreen_p.h"
 #include <QSocketNotifier>
 #include <QCoreApplication>
 #include <QLoggingCategory>
@@ -50,12 +51,12 @@ Q_DECLARE_LOGGING_CATEGORY(qLcEglfsKmsDebug)
 static void pageFlipHandler(int fd, unsigned int sequence, unsigned int tv_sec, unsigned int tv_usec, void *user_data)
 {
     Q_UNUSED(fd);
-    Q_UNUSED(sequence);
-    Q_UNUSED(tv_sec);
-    Q_UNUSED(tv_usec);
 
     QEglFSKmsEventReaderThread *t = static_cast<QEglFSKmsEventReaderThread *>(QThread::currentThread());
     t->eventHost()->handlePageFlipCompleted(user_data);
+
+    QEglFSKmsScreen *screen = static_cast<QEglFSKmsScreen *>(user_data);
+    screen->pageFlipped(sequence, tv_sec, tv_usec);
 }
 
 class RegisterWaitFlipEvent : public QEvent
diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsscreen.cpp b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsscreen.cpp
index 0a77e3e642..3bbdd55d34 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsscreen.cpp
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsscreen.cpp
@@ -254,4 +254,13 @@ void QEglFSKmsScreen::setPowerState(QPlatformScreen::PowerState state)
     m_powerState = state;
 }
 
+/* Informs exact page flip timing which can be used rendering optimization.
+   Consider this is from drm event reader thread. */
+void QEglFSKmsScreen::pageFlipped(unsigned int sequence, unsigned int tv_sec, unsigned int tv_usec)
+{
+    Q_UNUSED(sequence);
+    Q_UNUSED(tv_sec);
+    Q_UNUSED(tv_usec);
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsscreen_p.h b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsscreen_p.h
index db0aca0bd2..16ed6f4c30 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsscreen_p.h
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/qeglfskmsscreen_p.h
@@ -115,6 +115,7 @@ public:
     bool isCursorOutOfRange() const { return m_cursorOutOfRange; }
     void setCursorOutOfRange(bool b) { m_cursorOutOfRange = b; }
 
+    virtual void pageFlipped(unsigned int sequence, unsigned int tv_sec, unsigned int tv_usec);
 protected:
     QEglFSKmsDevice *m_device;