[Intel-gfx] [PATCH] drm/i915: Reset dpll_hw_state when selecting a new pll on hsw

[Daniel Vetter]

On Tue, Oct 13, 2015 at 03:18:16PM +0200, Maarten Lankhorst wrote:
> Op 23-09-15 om 17:34 schreef Gabriel Feceoru:
> > Using 2 connectors (DVI and VGA) will cause wrpll to be set for
> > INTEL_OUTPUT_HDMI but never reset if switching to INTEL_OUTPUT_VGA
> >
> > Supresses errors like these:
> > [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in dpll_hw_state.wrpll
> >
> Looks like a good idea to always zero it.

Except that we still have a bunch of cases where we recompute clock state
but only partially. Can we just move them all up into a common place
please? That would also catch cases where we simply forget to fill this
out at all.

One case I noticed is edp in skl_ddi_pll_select, but there's probably
more.
-Daniel
> 
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch