[Intel-gfx] [PATCH 18/25] drm/i915: disable pipe DDI function when disabling pipe

[Eugeni Dodonov]

This can be acomplished by simple writing 0 to the DDI function control
register too, but better be explicit about what fields we are unsetting
here to prevent possible issues.

Signed-off-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b70a826..2912207 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1626,6 +1626,16 @@ static void intel_disable_pipe(struct drm_i915_private *dev_priv,
 
 	I915_WRITE(reg, val & ~PIPECONF_ENABLE);
 	intel_wait_for_pipe_off(dev_priv->dev, pipe);
+
+	/* On HSW, disable pipe DDI function with the pipe */
+	if (IS_HASWELL(dev_priv->dev)) {
+		val = I915_READ(DDI_FUNC_CTL(pipe));
+		val &= ~PIPE_DDI_PORT_MASK;
+		val &= ~PIPE_DDI_FUNC_ENABLE;
+		I915_WRITE(DDI_FUNC_CTL(pipe),
+				val);
+	}
+
 }
 
 /*
-- 
1.7.10