Staging: fbtft: Fix bug in fbtft-core

commit fc1e2c8ea85e109acf09e74789e9b852f6eed251 upstream.

Commit 367e8560e8d7a62d96e9b1d644028a3816e04206 introduced a bug
in fbtft-core where fps is always 0, this is because variable
update_time is not assigned correctly.

Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Fixes: 367e8560e8d7 ("Staging: fbtbt: Replace timespec with ktime_t")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index b1e45161eefcf45cf04e65c1bdab3d2aa52dcf0c..18c2b6daf58857e1d1f34462d5e95a4e5e1d1178 100644 (file)
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -392,11 +392,11 @@ static void fbtft_update_display(struct fbtft_par *par, unsigned start_line,
 
        if (unlikely(timeit)) {
                ts_end = ktime_get();
-               if (ktime_to_ns(par->update_time))
+               if (!ktime_to_ns(par->update_time))
                        par->update_time = ts_start;
 
-               par->update_time = ts_start;
                fps = ktime_us_delta(ts_start, par->update_time);
+               par->update_time = ts_start;
                fps = fps ? 1000000 / fps : 0;
 
                throughput = ktime_us_delta(ts_end, ts_start);