drm/i915: Handle 64-bit return from drm_crtc_vblank_count()

570e86963a51 ("drm: Widen vblank count to 64-bits [v3]") changed the
return type for drm_crtc_vblank_count() to u64, store all the bits
without truncating. There is no need to type cast this value down to
32-bits.

Cc: Keith Packard <keithp@keithp.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180203051302.9974-3-dhinakaran.pandiyan@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -1593,7 +1593,7 @@ static int i915_fbc_status(struct seq_file *m, void *unused)
 		seq_printf(m, "FBC disabled: %s\n", fbc->no_fbc_reason);
 
 	if (fbc->work.scheduled)
-		seq_printf(m, "FBC worker scheduled on vblank %u, now %llu\n",
+		seq_printf(m, "FBC worker scheduled on vblank %llu, now %llu\n",
 			   fbc->work.scheduled_vblank,
 			   drm_crtc_vblank_count(&fbc->crtc->base));
 

drivers/gpu/drm/i915/i915_drv.h

@@ -723,7 +723,7 @@ struct intel_fbc {
 
 	struct intel_fbc_work {
 		bool scheduled;
-		u32 scheduled_vblank;
+		u64 scheduled_vblank;
 		struct work_struct work;
 	} work;