diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2013-10-26 17:38:52 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2014-01-20 11:06:26 +0200 |
| commit | 3c184f69917d16e295934fcbe0803355b544df64 (patch) | |
| tree | 8858d539118e451ab576b08459d8a4d69ed822f9 /drivers/gpu | |
| parent | 77666b72260da3a5290471de77e2d2261244db83 (diff) | |
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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 52a234c4160e..91e8b4c55ea0 100644 --- 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) |