drm/sti: Use 64-bit timestamps

'struct timespec' uses a 32-bit field for seconds, which
will overflow in year 2038 and beyond. This patch is part
of a larger attempt to remove instances of timeval, timespec
and time_t, all of which suffer from the y2038 issue, from the
kernel.

Signed-off-by: Tina Ruchandani <ruchandani.tina@gmail.com>

2 files changed, 4 insertions, 14 deletions

diff --git a/drivers/gpu/drm/sti/sti_plane.c b/drivers/gpu/drm/sti/sti_plane.c
index 85cee9098439..0cf3335ef37c 100644
--- a/drivers/gpu/drm/sti/sti_plane.c
+++ b/drivers/gpu/drm/sti/sti_plane.c
@@ -45,25 +45,15 @@ const char *sti_plane_to_str(struct sti_plane *plane)
 
 #define STI_FPS_INTERVAL_MS     3000
 
-static int sti_plane_timespec_ms_diff(struct timespec lhs, struct timespec rhs)
-{
-        struct timespec tmp_ts = timespec_sub(lhs, rhs);
-        u64 tmp_ns = (u64)timespec_to_ns(&tmp_ts);
-
-        do_div(tmp_ns, NSEC_PER_MSEC);
-
-        return (u32)tmp_ns;
-}
-
 void sti_plane_update_fps(struct sti_plane *plane,
                           bool new_frame,
                           bool new_field)
 {
-        struct timespec now;
+        ktime_t now;
         struct sti_fps_info *fps;
         int fpks, fipks, ms_since_last, num_frames, num_fields;
 
-        getrawmonotonic(&now);
+        now = ktime_get();
 
         /* Compute number of frame updates */
         fps = &plane->fps_info;
@@ -76,7 +66,7 @@ void sti_plane_update_fps(struct sti_plane *plane,
                 return;
 
         fps->curr_frame_counter++;
-        ms_since_last = sti_plane_timespec_ms_diff(now, fps->last_timestamp);
+        ms_since_last = ktime_to_ms(ktime_sub(now, fps->last_timestamp));
         num_frames = fps->curr_frame_counter - fps->last_frame_counter;
 
         if (num_frames <= 0  || ms_since_last < STI_FPS_INTERVAL_MS)
diff --git a/drivers/gpu/drm/sti/sti_plane.h b/drivers/gpu/drm/sti/sti_plane.h
index 39d39f5b7dd9..e0ea1dd3bb88 100644
--- a/drivers/gpu/drm/sti/sti_plane.h
+++ b/drivers/gpu/drm/sti/sti_plane.h
@@ -55,7 +55,7 @@ struct sti_fps_info {
         unsigned int last_frame_counter;
         unsigned int curr_field_counter;
         unsigned int last_field_counter;
-        struct timespec last_timestamp;
+        ktime_t      last_timestamp;
         char fps_str[FPS_LENGTH];
         char fips_str[FPS_LENGTH];
 };