drm/i915: Always program m2 fractional value on CHV

When fractional m2 divider isn't used on CHV the fractional part
is ignore by the hardware. Despite that, program the fractional
value (0 in this case) to the hardware register just to keep
things a bit more consistent. Might at least make register dumps
a bit less confusing when there isn't some stale fractional part
hanging around.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Deepak S <deepak.s@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index cf8dfa53e33833ecefad746d18e8423eac6788ed..a64da67b4f40941534fc1f8025b079058ff4e387 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7374,8 +7374,7 @@ static void chv_prepare_pll(struct intel_crtc *crtc,
                        1 << DPIO_CHV_N_DIV_SHIFT);
 
        /* M2 fraction division */
-       if (bestm2_frac)
-               vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW2(port), bestm2_frac);
+       vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW2(port), bestm2_frac);
 
        /* M2 fraction division enable */
        dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));