mali_fbdev: fix assertion failed on video threaded switch (#14316)

* mali_fbdev: fix assertion failed on video thread switch

* mali_fbdev: added fallback to get refresh rate currently set

gfx/drivers_context/mali_fbdev_ctx.c

@@ -38,6 +38,8 @@
 #include "../../verbosity.h"
 #include "../../configuration.h"
 
+#include <streams/file_stream.h>
+
 typedef struct
 {
 #ifdef HAVE_EGL
@@ -93,7 +95,25 @@ static int gfx_ctx_mali_fbdev_get_vinfo(void *data)
            (vinfo.yres + vinfo.upper_margin + vinfo.lower_margin + vinfo.vsync_len) /
            (vinfo.xres + vinfo.left_margin  + vinfo.right_margin + vinfo.hsync_len);
    }else{
-      mali->refresh_rate = 60;
+      /* Workaround to retrieve current refresh rate if no info is available from IOCTL.
+         If this fails as well, 60Hz is assumed... */
+      int j=0;
+      float k=60.0;
+      char temp[32];
+      RFILE *fr = filestream_open("/sys/class/display/mode", RETRO_VFS_FILE_ACCESS_READ, RETRO_VFS_FILE_ACCESS_HINT_NONE);
+      if (fr){
+         if (filestream_gets(fr, temp, sizeof(temp))){
+            for (int i=0;i<sizeof(temp);i++){
+               if (*(temp+i)=='p' || *(temp+i)=='i')
+                  j=i;
+               else if (*(temp+i)=='h')
+                  *(temp+i)='\0';
+            }
+            k = j ? atof(temp+j+1) : k;
+         }
+         filestream_close(fr);
+      }
+      mali->refresh_rate = k;
    }
 
    return 0;
@@ -127,6 +147,27 @@ static void gfx_ctx_mali_fbdev_clear_screen(void)
       }
 }
 
+static void gfx_ctx_mali_fbdev_destroy_really(void)
+{
+   if (gfx_ctx_mali_fbdev_global)
+   {
+#ifdef HAVE_EGL
+      egl_destroy(&gfx_ctx_mali_fbdev_global->egl);
+#endif
+      gfx_ctx_mali_fbdev_global->resize=false;
+      free(gfx_ctx_mali_fbdev_global);
+      gfx_ctx_mali_fbdev_global=NULL;
+   }
+}
+
+static void gfx_ctx_mali_fbdev_maybe_restart(void)
+{
+   runloop_state_t *runloop_st   = runloop_state_get_ptr();
+
+   if (!runloop_st->shutdown_initiated)
+      frontend_driver_set_fork(FRONTEND_FORK_RESTART);
+}
+
 /*TODO FIXME
 As egl_destroy does not work properly with libmali (big fps drop after destroy and initialization/creation of new context/surface), it is not used.
 A global pointers is initialized at startup in gfx_ctx_mali_fbdev_init, and returned each time gfx_ctx_mali_fbdev_init is called.
@@ -137,31 +178,25 @@ All these workarounds should be reverted when and if egl_destroy issues in libma
 */
 static void gfx_ctx_mali_fbdev_destroy(void *data)
 {
-/*   mali_ctx_data_t *mali = (mali_ctx_data_t*)data;
-
-   if (mali)
-   {
-#ifdef HAVE_EGL
-       egl_destroy(&mali->egl);
-#endif
-
-       mali->resize       = false;
-       free(mali);
-   }
-*/
    runloop_state_t *runloop_st   = runloop_state_get_ptr();
 
-   if (runloop_st->shutdown_initiated && gfx_ctx_mali_fbdev_was_threaded==*video_driver_get_threaded() && !gfx_ctx_mali_fbdev_hw_ctx_trigger)
+   if (runloop_st->shutdown_initiated)
    {
-      gfx_ctx_mali_fbdev_clear_screen();
+      if (!gfx_ctx_mali_fbdev_restart_pending)
-   }else if (gfx_ctx_mali_fbdev_hw_ctx_trigger)
+      {
+         gfx_ctx_mali_fbdev_destroy_really();
+         gfx_ctx_mali_fbdev_clear_screen();
+      }
+   }
+   else
    {
-      video_context_driver_reset();
+      if (gfx_ctx_mali_fbdev_hw_ctx_trigger || gfx_ctx_mali_fbdev_was_threaded!=*video_driver_get_threaded())
-      gfx_ctx_mali_fbdev_global=NULL;
+      {
-      gfx_ctx_mali_fbdev_restart_pending=true;
+         gfx_ctx_mali_fbdev_destroy_really();
-   }else if (gfx_ctx_mali_fbdev_was_threaded!=*video_driver_get_threaded()){
+         gfx_ctx_mali_fbdev_restart_pending=true;
-      gfx_ctx_mali_fbdev_global=NULL;
+         if (!gfx_ctx_mali_fbdev_hw_ctx_trigger)
-      command_event(CMD_EVENT_RESTART_RETROARCH,NULL);
+            gfx_ctx_mali_fbdev_maybe_restart();
+      }
    }
 }
 
@@ -244,7 +279,7 @@ static void gfx_ctx_mali_fbdev_check_window(void *data, bool *quit,
    *quit   = (bool)frontend_driver_get_signal_handler_state();
 
    if (gfx_ctx_mali_fbdev_restart_pending)
-      command_event(CMD_EVENT_RESTART_RETROARCH,NULL);
+      gfx_ctx_mali_fbdev_maybe_restart();
 }
 
 static bool gfx_ctx_mali_fbdev_set_video_mode(void *data,