drm/nv50/pm: fix thinko which lead to clocks being slightly off sometimes

read_pll_ref() needs to take into account the refclk src bits in 0xc040 on
some chipsets, it wasn't doing this.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2011-10-30 23:10:55 +10:00
commit 463464eb9b