drm: Change {pixel,line,frame}dur_ns from s64 to int

Using s64 for the timestamping constants is wasteful. Signed 32bit
integers get us a range of over +-2 seconds. Presuming that no-one
wants to a vrefresh rate less than 0.5, we can switch to using int
for the timestamping constants. We save a few bytes in drm_crtc and
avoid a bunch of 64bit math.

Reviewed-by: mario.kleiner.de@gmail.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 52a234c..91e8b4c 100644 (file)
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -450,7 +450,7 @@ int drm_control(struct drm_device *dev, void *data,
 void drm_calc_timestamping_constants(struct drm_crtc *crtc,
                                     const struct drm_display_mode *mode)
 {
-       s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
+       int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
        int dotclock = mode->crtc_clock;
 
        /* Fields of interlaced scanout modes are only half a frame duration.
@@ -483,8 +483,8 @@ void drm_calc_timestamping_constants(struct drm_crtc *crtc,
                  crtc->base.id, mode->crtc_htotal,
                  mode->crtc_vtotal, mode->crtc_vdisplay);
        DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n",
-                 crtc->base.id, dotclock, (int) framedur_ns,
-                 (int) linedur_ns, (int) pixeldur_ns);
+                 crtc->base.id, dotclock, framedur_ns,
+                 linedur_ns, pixeldur_ns);
 }
 EXPORT_SYMBOL(drm_calc_timestamping_constants);
 
@@ -544,7 +544,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
        struct timeval tv_etime;
        int vbl_status, vtotal, vdisplay;
        int vpos, hpos, i;
-       s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;
+       int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;
        bool invbl;
 
        if (crtc < 0 || crtc >= dev->num_crtcs) {
@@ -607,18 +607,18 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
                duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime);
 
                /* Accept result with <  max_error nsecs timing uncertainty. */
-               if (duration_ns <= (s64) *max_error)
+               if (duration_ns <= *max_error)
                        break;
        }
 
        /* Noisy system timing? */
        if (i == DRM_TIMESTAMP_MAXRETRIES) {
                DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n",
-                         crtc, (int) duration_ns/1000, *max_error/1000, i);
+                         crtc, duration_ns/1000, *max_error/1000, i);
        }
 
        /* Return upper bound of timestamp precision error. */
-       *max_error = (int) duration_ns;
+       *max_error = duration_ns;
 
        /* Check if in vblank area:
         * vpos is >=0 in video scanout area, but negative
@@ -631,7 +631,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
         * since start of scanout at first display scanline. delta_ns
         * can be negative if start of scanout hasn't happened yet.
         */
-       delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns;
+       delta_ns = vpos * linedur_ns + hpos * pixeldur_ns;
 
        /* Is vpos outside nominal vblank area, but less than
         * 1/100 of a frame height away from start of vblank?
@@ -669,7 +669,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
                  crtc, (int)vbl_status, hpos, vpos,
                  (long)tv_etime.tv_sec, (long)tv_etime.tv_usec,
                  (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
-                 (int)duration_ns/1000, i);
+                 duration_ns/1000, i);
 
        vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
        if (invbl)

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index f32c5cd..a158ec0 100644 (file)
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -447,7 +447,7 @@ struct drm_crtc {
        uint16_t *gamma_store;
 
        /* Constants needed for precise vblank and swap timestamping. */
-       s64 framedur_ns, linedur_ns, pixeldur_ns;
+       int framedur_ns, linedur_ns, pixeldur_ns;
 
        /* if you are using the helper */
        void *helper_private;