diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_display.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_display.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index 456cb384317f..4833eaeb8f0b 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -13237,6 +13237,24 @@ static void intel_early_display_was(struct drm_i915_private *dev_priv) KBL_ARB_FILL_SPARE_13 | KBL_ARB_FILL_SPARE_14, KBL_ARB_FILL_SPARE_14); } + + if (IS_ADLP_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B0)) { + u32 val; + + /* + * Wa_16011069516:adl-p[a0] + * + * All CMTG regs are unreliable until CMTG clock gating is + * disabled, so we can only assume the default CMTG_CHICKEN + * reg value and sanity check this assumption with a double + * read, which presumably returns the correct value even with + * clock gating on. + */ + val = intel_de_read(dev_priv, TRANS_CMTG_CHICKEN); + val = intel_de_read(dev_priv, TRANS_CMTG_CHICKEN); + intel_de_write(dev_priv, TRANS_CMTG_CHICKEN, DISABLE_DPT_CLK_GATING); + drm_WARN_ON(&dev_priv->drm, val & ~DISABLE_DPT_CLK_GATING); + } } static void ibx_sanitize_pch_hdmi_port(struct drm_i915_private *dev_priv, |