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drm/modes: Add drm_mode_hsync()

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Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Adam Jackson
2009-12-03 17:44:37 -05:00
committed by Dave Airlie
parent 9cf00977da
commit 7ac96a9cb4
2 changed files with 31 additions and 4 deletions
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28
drivers/gpu/drm/drm_modes.c
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@ -553,6 +553,32 @@ int drm_mode_height(struct drm_display_mode *mode)
}
EXPORT_SYMBOL(drm_mode_height);
/** drm_mode_hsync - get the hsync of a mode
* @mode: mode
*
* LOCKING:
* None.
*
* Return @modes's hsync rate in kHz, rounded to the nearest int.
*/
int drm_mode_hsync(struct drm_display_mode *mode)
{
unsigned int calc_val;
if (mode->hsync)
return mode->hsync;
if (mode->htotal < 0)
return 0;
calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
calc_val += 500; /* round to 1000Hz */
calc_val /= 1000; /* truncate to kHz */
return calc_val;
}
EXPORT_SYMBOL(drm_mode_hsync);
/**
* drm_mode_vrefresh - get the vrefresh of a mode
* @mode: mode
@ -560,7 +586,7 @@ EXPORT_SYMBOL(drm_mode_height);
* LOCKING:
* None.
*
* Return @mode's vrefresh rate or calculate it if necessary.
* Return @mode's vrefresh rate in Hz or calculate it if necessary.
*
* FIXME: why is this needed? shouldn't vrefresh be set already?
*