drm/i915: don't set transcoder bpc on CougarPoint (e9bcff5c) · Commits · 戴 / test

This prevents us from setting reserved or incorrect bits on CougarPoint. Signed-off-by:

drivers/gpu/drm/i915/intel_display.c

+9 −6

Original line number	Diff line number	Diff line
		@@ -1158,12 +1158,15 @@ static void intel_enable_transcoder(struct drm_i915_private *dev_priv,

		reg = TRANSCONF(pipe);
		val = I915_READ(reg);

		if (HAS_PCH_IBX(dev_priv->dev)) {
		/*
		* make the BPC in transcoder be consistent with
		* that in pipeconf reg.
		*/
		val &= ~PIPE_BPC_MASK;
		val \|= I915_READ(PIPECONF(pipe)) & PIPE_BPC_MASK;
		}
		I915_WRITE(reg, val \| TRANS_ENABLE);
		if (wait_for(I915_READ(reg) & TRANS_STATE_ENABLE, 100))
		DRM_ERROR("failed to enable transcoder %d\n", pipe);