[media] bdisp-debug: don't try to divide by s64

There are several warnings there, on some architectures, related
to dividing a s32 by a s64 value:

drivers/media/platform/sti/bdisp/bdisp-debug.c:594: warning: comparison of distinct pointer types lacks a cast
drivers/media/platform/sti/bdisp/bdisp-debug.c:594: warning: right shift count >= width of type
drivers/media/platform/sti/bdisp/bdisp-debug.c:594: warning: passing argument 1 of '__div64_32' from incompatible pointer type
drivers/media/platform/sti/bdisp/bdisp-debug.c:595: warning: comparison of distinct pointer types lacks a cast
drivers/media/platform/sti/bdisp/bdisp-debug.c:595: warning: right shift count >= width of type
drivers/media/platform/sti/bdisp/bdisp-debug.c:595: warning: passing argument 1 of '__div64_32' from incompatible pointer type  CC [M]  drivers/media/tuners/mt2060.o
drivers/media/platform/sti/bdisp/bdisp-debug.c:596: warning: comparison of distinct pointer types lacks a cast
drivers/media/platform/sti/bdisp/bdisp-debug.c:596: warning: right shift count >= width of type
drivers/media/platform/sti/bdisp/bdisp-debug.c:596: warning: passing argument 1 of '__div64_32' from incompatible pointer type
drivers/media/platform/sti/bdisp/bdisp-debug.c:597: warning: comparison of distinct pointer types lacks a cast
drivers/media/platform/sti/bdisp/bdisp-debug.c:597: warning: right shift count >= width of type
drivers/media/platform/sti/bdisp/bdisp-debug.c:597: warning: passing argument 1 of '__div64_32' from incompatible pointer type

That doesn't make much sense. What the driver is actually trying
to do is to divide one second by a value. So, check the range
before dividing. That warrants the right result and will remove
the warnings on non-64 bits archs.

Also fixes this warning:
drivers/media/platform/sti/bdisp/bdisp-debug.c:588: warning: comparison of distinct pointer types lacks a cast

by using div64_s64() instead of calling do_div() directly.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/sti/bdisp/bdisp-debug.c

@@ -572,6 +572,8 @@ static int bdisp_dbg_regs(struct seq_file *s, void *data)
 	return 0;
 }
 
+#define SECOND 1000000
+
 static int bdisp_dbg_perf(struct seq_file *s, void *data)
 {
 	struct bdisp_dev *bdisp = s->private;
@@ -584,17 +586,26 @@ static int bdisp_dbg_perf(struct seq_file *s, void *data)
 		return 0;
 	}
 
-	avg_time_us = bdisp->dbg.tot_duration;
-	do_div(avg_time_us, request->nb_req);
-
-	avg_fps = 1000000;
-	min_fps = 1000000;
-	max_fps = 1000000;
-	last_fps = 1000000;
-	do_div(avg_fps, avg_time_us);
-	do_div(min_fps, bdisp->dbg.min_duration);
-	do_div(max_fps, bdisp->dbg.max_duration);
-	do_div(last_fps, bdisp->dbg.last_duration);
+	avg_time_us = div64_s64(bdisp->dbg.tot_duration, request->nb_req);
+	if (avg_time_us > SECOND)
+		avg_fps = 0;
+	else
+		avg_fps = SECOND / (s32)avg_time_us;
+
+	if (bdisp->dbg.min_duration > SECOND)
+		min_fps = 0;
+	else
+		min_fps = SECOND / (s32)bdisp->dbg.min_duration;
+
+	if (bdisp->dbg.max_duration > SECOND)
+		max_fps = 0;
+	else
+		max_fps = SECOND / (s32)bdisp->dbg.max_duration;
+
+	if (bdisp->dbg.last_duration > SECOND)
+		last_fps = 0;
+	else
+		last_fps = SECOND / (s32)bdisp->dbg.last_duration;
 
 	seq_printf(s, "HW processing (%d requests):\n", request->nb_req);
 	seq_printf(s, " Average: %5lld us  (%3d fps)\n",