drm/i915: Eliminate the CDCLK_CTL RMW on BXT

All the fields in CDCLK_CTL we don't program should be left at zero, so
let's just get rid of the RMW.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1462995892-32416-14-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
This commit is contained in:
Ville Syrjälä 2016-05-11 22:44:52 +03:00
parent 7fe6275721
commit b8e757057d
1 changed files with 1 additions and 7 deletions
drivers/gpu/drm/i915

View File

@ -5429,24 +5429,18 @@ static void broxton_set_cdclk(struct drm_i915_private *dev_priv, int cdclk)
if (wait_for(I915_READ(BXT_DE_PLL_ENABLE) & BXT_DE_PLL_LOCK, 1))
DRM_ERROR("timeout waiting for DE PLL lock\n");
val = I915_READ(CDCLK_CTL);
val = divider | skl_cdclk_decimal(cdclk);
/*
* FIXME if only the cd2x divider needs changing, it could be done
* without shutting off the pipe (if only one pipe is active).
*/
val |= BXT_CDCLK_CD2X_PIPE_NONE;
val &= ~BXT_CDCLK_CD2X_DIV_SEL_MASK;
val |= divider;
/*
* Disable SSA Precharge when CD clock frequency < 500 MHz,
* enable otherwise.
*/
val &= ~BXT_CDCLK_SSA_PRECHARGE_ENABLE;
if (cdclk >= 500000)
val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
val &= ~CDCLK_FREQ_DECIMAL_MASK;
val |= skl_cdclk_decimal(cdclk);
I915_WRITE(CDCLK_CTL, val);
}