drm/i915: s/dpio_lock/sb_lock/

Rename dpio_lock to sb_lock to inform the reader that its primary
purpose is to protect the sideband mailbox rather than some DPIO
state.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index e7e9061..4117092 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1293,7 +1293,7 @@
 	u32 val;
 
 	/* Enable clock channels for this port */
-	mutex_lock(&dev_priv->dpio_lock);
+	mutex_lock(&dev_priv->sb_lock);
 	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(port));
 	val = 0;
 	if (pipe)
@@ -1316,7 +1316,7 @@
 	/* Program lane clock */
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW14(port), 0x00760018);
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW23(port), 0x00400888);
-	mutex_unlock(&dev_priv->dpio_lock);
+	mutex_unlock(&dev_priv->sb_lock);
 
 	intel_hdmi->set_infoframes(&encoder->base,
 				   intel_crtc->config->has_hdmi_sink,
@@ -1340,7 +1340,7 @@
 	intel_hdmi_prepare(encoder);
 
 	/* Program Tx lane resets to default */
-	mutex_lock(&dev_priv->dpio_lock);
+	mutex_lock(&dev_priv->sb_lock);
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(port),
 			 DPIO_PCS_TX_LANE2_RESET |
 			 DPIO_PCS_TX_LANE1_RESET);
@@ -1357,7 +1357,7 @@
 
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW9(port), 0x00002000);
 	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), DPIO_TX_OCALINIT_EN);
-	mutex_unlock(&dev_priv->dpio_lock);
+	mutex_unlock(&dev_priv->sb_lock);
 }
 
 static void chv_hdmi_pre_pll_enable(struct intel_encoder *encoder)
@@ -1373,7 +1373,7 @@
 
 	intel_hdmi_prepare(encoder);
 
-	mutex_lock(&dev_priv->dpio_lock);
+	mutex_lock(&dev_priv->sb_lock);
 
 	/* program left/right clock distribution */
 	if (pipe != PIPE_B) {
@@ -1423,7 +1423,7 @@
 		val |= CHV_CMN_USEDCLKCHANNEL;
 	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW19(ch), val);
 
-	mutex_unlock(&dev_priv->dpio_lock);
+	mutex_unlock(&dev_priv->sb_lock);
 }
 
 static void vlv_hdmi_post_disable(struct intel_encoder *encoder)
@@ -1436,10 +1436,10 @@
 	int pipe = intel_crtc->pipe;
 
 	/* Reset lanes to avoid HDMI flicker (VLV w/a) */
-	mutex_lock(&dev_priv->dpio_lock);
+	mutex_lock(&dev_priv->sb_lock);
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(port), 0x00000000);
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(port), 0x00e00060);
-	mutex_unlock(&dev_priv->dpio_lock);
+	mutex_unlock(&dev_priv->sb_lock);
 }
 
 static void chv_hdmi_post_disable(struct intel_encoder *encoder)
@@ -1453,7 +1453,7 @@
 	enum pipe pipe = intel_crtc->pipe;
 	u32 val;
 
-	mutex_lock(&dev_priv->dpio_lock);
+	mutex_lock(&dev_priv->sb_lock);
 
 	/* Propagate soft reset to data lane reset */
 	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
@@ -1472,7 +1472,7 @@
 	val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
 
-	mutex_unlock(&dev_priv->dpio_lock);
+	mutex_unlock(&dev_priv->sb_lock);
 }
 
 static void chv_hdmi_pre_enable(struct intel_encoder *encoder)
@@ -1490,7 +1490,7 @@
 	int data, i, stagger;
 	u32 val;
 
-	mutex_lock(&dev_priv->dpio_lock);
+	mutex_lock(&dev_priv->sb_lock);
 
 	/* allow hardware to manage TX FIFO reset source */
 	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW11(ch));
@@ -1633,7 +1633,7 @@
 	val |= DPIO_LRC_BYPASS;
 	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, val);
 
-	mutex_unlock(&dev_priv->dpio_lock);
+	mutex_unlock(&dev_priv->sb_lock);
 
 	intel_hdmi->set_infoframes(&encoder->base,
 				   intel_crtc->config->has_hdmi_sink,