andreacavalli/xserver-multidpi
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modesetting: Fix possible_crtcs

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Populate outout possible_crtcs as the union of possible_crtcs from
the encoders rather than the intersection. Otherwise we're easily left
with possible_crtcs==0 when all the possible encoders have
non-overlapping possible_crtcs.

No idea what the magic 0x7f is about, but keep it around in case
it matters.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
(cherry picked from commit 0e4bd71d02)
This commit is contained in:
Ville Syrjälä 2019-09-03 16:44:56 +03:00 committed by Matt Turner
parent f1e76731a0
commit d16f640315
1 changed files with 2 additions and 2 deletions
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hw/xfree86/drivers/modesetting/drmmode_display.c
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@ -2997,9 +2997,9 @@ drmmode_output_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode, drmModeResPtr mode_r
output->driver_private = drmmode_output;
output->non_desktop = nonDesktop;
output->possible_crtcs = 0x7f;
output->possible_crtcs = 0;
for (i = 0; i < koutput->count_encoders; i++) {
output->possible_crtcs &= kencoders[i]->possible_crtcs >> crtcshift;
output->possible_crtcs |= (kencoders[i]->possible_crtcs >> crtcshift) & 0x7f;
}
/* work out the possible clones later */
output->possible_clones = 0;