Re: [Intel-gfx] [PATCH] drm/i915: Don't take fp 0/1 selector into account for pll state

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Sun, Jun 15, 2014 at 02:55:42PM +0200, Daniel Vetter wrote:
> It changes at runtime and so should be ignored for pipe state checks.
> Note that we don't yet read out the full DRRS state, so there's some
> gaps. Bu DRRS is also not yet enabled for LVDS by default.
> 
> Cc: Aleks <aleks@slobodensoftver.org.mk>
> Reported-by: Aleks <aleks@slobodensoftver.org.mk>
> Cc: stable@vger.kernel.org
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index ba1d9aac3958..1ccf660e67d9 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -8549,6 +8549,9 @@ static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
>  	else
>  		fp = pipe_config->dpll_hw_state.fp1;
>  
> +	/* We don't compute the FPA 0/1 selector. */
> +	dpll &= ~DISPLAY_RATE_SELECT_FPA1;
> +

But we still compute port_clock based on the currently active FPA
register. Won't that make the clock checks fail as well?

>  	clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
>  	if (IS_PINEVIEW(dev)) {
>  		clock.n = ffs((fp & FP_N_PINEVIEW_DIV_MASK) >> FP_N_DIV_SHIFT) - 1;
> -- 
> 2.0.0
> 
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-- 
Ville Syrjälä
Intel OTC