From: Paulo Zanoni Date: Thu, 26 Jul 2018 00:12:29 +0000 (-0700) Subject: drm/i915/icl: don't set CNL_DDI_CLOCK_REG_ACCESS_ON anymore X-Git-Tag: v4.20-rc1~81^2~28^2~131 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=c50dfe79ec3ea28efe494808576d281738056d90;p=linux.git drm/i915/icl: don't set CNL_DDI_CLOCK_REG_ACCESS_ON anymore The new recommendation from the spec is to simply not set this bit anymore. Not setting the bit would prevent some hangs that our driver manages to avoid since commit c8af5274c3cb ("drm/i915: enable the pipe/transcoder/planes later on HSW+"), and the theoretical downside of not setting the bit doesn't seem realistic according to the HW team. Let's follow their recommendation. BSpec: 20233 References: commit c8af5274c3cb ("drm/i915: enable the pipe/transcoder/planes later on HSW+") Cc: José Roberto de Souza Reviewed-by: José Roberto de Souza Signed-off-by: Paulo Zanoni Link: https://patchwork.freedesktop.org/patch/msgid/20180726001229.13791-1-paulo.r.zanoni@intel.com --- diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c index 6b5aa3b074ec..cf89141b2281 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -3372,10 +3372,6 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv, /* 7. Setup MBUS. */ icl_mbus_init(dev_priv); - - /* 8. CHICKEN_DCPR_1 */ - I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_READ(GEN8_CHICKEN_DCPR_1) | - CNL_DDI_CLOCK_REG_ACCESS_ON); } static void icl_display_core_uninit(struct drm_i915_private *dev_priv)