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ecore_drm2: Better handling of blank time checks 

On some systems we'll successfully complete the vblank ioctl but get
a reply of 0.  When that happens we can't use that time for ticking
as it will break all of the entire world.

Fixes immediate screen blank on rpi3.

@ref T5977
This commit is contained in:
Derek Foreman 2017-09-05 12:08:02 -05:00
parent e1738c4f1e
commit 1848f9a8e6
1 changed files with 3 additions and 3 deletions
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6
src/lib/ecore_drm2/ecore_drm2_outputs.c
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@ -1596,6 +1596,7 @@ ecore_drm2_output_blanktime_get(Ecore_Drm2_Output *output, int sequence, long *s
{
drmVBlank v;
int ret;
Eina_Bool success;
EINA_SAFETY_ON_NULL_RETURN_VAL(output, EINA_FALSE);
EINA_SAFETY_ON_NULL_RETURN_VAL(sec, EINA_FALSE);
@ -1605,14 +1606,13 @@ ecore_drm2_output_blanktime_get(Ecore_Drm2_Output *output, int sequence, long *s
v.request.type = DRM_VBLANK_RELATIVE;
v.request.sequence = sequence;
ret = sym_drmWaitVBlank(output->fd, &v);
if (ret)
success = (ret == 0) && (v.reply.tval_sec > 0 || v.reply.tval_usec > 0);
if (!success)
{
ret = _blanktime_fallback(output, sequence, sec, usec);
if (ret) return EINA_FALSE;
return EINA_TRUE;
}
if (v.reply.tval_sec < 0) return EINA_FALSE;
if (v.reply.tval_usec < 0) return EINA_FALSE;
*sec = v.reply.tval_sec;
*usec = v.reply.tval_usec;