[PATCH 02/25] drm/i915: Lift acquiring the vlv punit to the callers

Chris Wilson chris at chris-wilson.co.uk
Thu Jan 11 18:09:27 UTC 2018


As we now employ a very heavy pm_qos around the punit access, we want to
minimise the number of synchronous requests by performing one for the
whole punit sequence rather than around individual accesses. The
sideband lock is used for this, so push the pm_qos into the sideband
lock acquisition and release, moving it from the lowlevel punit rw
routine to the callers.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.h         | 10 ++++++
 drivers/gpu/drm/i915/intel_cdclk.c      |  4 +--
 drivers/gpu/drm/i915/intel_display.c    | 36 ++++++++++-----------
 drivers/gpu/drm/i915/intel_dp.c         |  4 +--
 drivers/gpu/drm/i915/intel_dpio_phy.c   | 33 ++++++++++----------
 drivers/gpu/drm/i915/intel_dsi.c        |  8 ++---
 drivers/gpu/drm/i915/intel_dsi_pll.c    | 14 ++++-----
 drivers/gpu/drm/i915/intel_dsi_vbt.c    |  8 ++---
 drivers/gpu/drm/i915/intel_hdmi.c       |  4 +--
 drivers/gpu/drm/i915/intel_pm.c         |  4 +--
 drivers/gpu/drm/i915/intel_runtime_pm.c |  8 ++---
 drivers/gpu/drm/i915/intel_sideband.c   | 55 ++++++++++++++++++++-------------
 12 files changed, 104 insertions(+), 84 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ff3f9effc0bb..40a61fd13bef 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3724,19 +3724,29 @@ int skl_pcode_request(struct drm_i915_private *dev_priv, u32 mbox, u32 request,
 		      u32 reply_mask, u32 reply, int timeout_base_ms);
 
 /* intel_sideband.c */
+void vlv_sideband_get(struct drm_i915_private *dev_priv);
+void vlv_sideband_put(struct drm_i915_private *dev_priv);
+
 u32 vlv_punit_read(struct drm_i915_private *dev_priv, u32 addr);
 int vlv_punit_write(struct drm_i915_private *dev_priv, u32 addr, u32 val);
+
 u32 vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr);
+
 u32 vlv_iosf_sb_read(struct drm_i915_private *dev_priv, u8 port, u32 reg);
 void vlv_iosf_sb_write(struct drm_i915_private *dev_priv, u8 port, u32 reg, u32 val);
+
 u32 vlv_cck_read(struct drm_i915_private *dev_priv, u32 reg);
 void vlv_cck_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
+
 u32 vlv_ccu_read(struct drm_i915_private *dev_priv, u32 reg);
 void vlv_ccu_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
+
 u32 vlv_bunit_read(struct drm_i915_private *dev_priv, u32 reg);
 void vlv_bunit_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
+
 u32 vlv_dpio_read(struct drm_i915_private *dev_priv, enum pipe pipe, int reg);
 void vlv_dpio_write(struct drm_i915_private *dev_priv, enum pipe pipe, int reg, u32 val);
+
 u32 intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg,
 		   enum intel_sbi_destination destination);
 void intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index ca36321eafac..20189cad0eab 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -552,7 +552,7 @@ static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
 	}
 	mutex_unlock(&dev_priv->pcu_lock);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	if (cdclk == 400000) {
 		u32 divider;
@@ -586,7 +586,7 @@ static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
 		val |= 3000 / 250; /* 3.0 usec */
 	vlv_bunit_write(dev_priv, BUNIT_REG_BISOC, val);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	intel_update_cdclk(dev_priv);
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 221e3a183d36..345cccaba6d9 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -165,10 +165,10 @@ int vlv_get_hpll_vco(struct drm_i915_private *dev_priv)
 	int hpll_freq, vco_freq[] = { 800, 1600, 2000, 2400 };
 
 	/* Obtain SKU information */
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	hpll_freq = vlv_cck_read(dev_priv, CCK_FUSE_REG) &
 		CCK_FUSE_HPLL_FREQ_MASK;
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	return vco_freq[hpll_freq] * 1000;
 }
@@ -179,9 +179,9 @@ int vlv_get_cck_clock(struct drm_i915_private *dev_priv,
 	u32 val;
 	int divider;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	val = vlv_cck_read(dev_priv, reg);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	divider = val & CCK_FREQUENCY_VALUES;
 
@@ -1078,9 +1078,9 @@ void assert_dsi_pll(struct drm_i915_private *dev_priv, bool state)
 	u32 val;
 	bool cur_state;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	val = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	cur_state = val & DSI_PLL_VCO_EN;
 	I915_STATE_WARN(cur_state != state,
@@ -1428,14 +1428,14 @@ static void _chv_enable_pll(struct intel_crtc *crtc,
 	enum dpio_channel port = vlv_pipe_to_channel(pipe);
 	u32 tmp;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* Enable back the 10bit clock to display controller */
 	tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
 	tmp |= DPIO_DCLKP_EN;
 	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), tmp);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	/*
 	 * Need to wait > 100ns between dclkp clock enable bit and PLL enable.
@@ -1620,14 +1620,14 @@ static void chv_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
 	I915_WRITE(DPLL(pipe), val);
 	POSTING_READ(DPLL(pipe));
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* Disable 10bit clock to display controller */
 	val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
 	val &= ~DPIO_DCLKP_EN;
 	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), val);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 void vlv_wait_port_ready(struct drm_i915_private *dev_priv,
@@ -6638,7 +6638,7 @@ static void vlv_prepare_pll(struct intel_crtc *crtc,
 	if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
 		return;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	bestn = pipe_config->dpll.n;
 	bestm1 = pipe_config->dpll.m1;
@@ -6715,7 +6715,7 @@ static void vlv_prepare_pll(struct intel_crtc *crtc,
 	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW7(pipe), coreclk);
 
 	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW11(pipe), 0x87871000);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 static void chv_prepare_pll(struct intel_crtc *crtc,
@@ -6748,7 +6748,7 @@ static void chv_prepare_pll(struct intel_crtc *crtc,
 	dpio_val = 0;
 	loopfilter = 0;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* p1 and p2 divider */
 	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW13(port),
@@ -6820,7 +6820,7 @@ static void chv_prepare_pll(struct intel_crtc *crtc,
 			vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port)) |
 			DPIO_AFC_RECAL);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 /**
@@ -7422,9 +7422,9 @@ static void vlv_crtc_clock_get(struct intel_crtc *crtc,
 	if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
 		return;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	mdiv = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW3(pipe));
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	clock.m1 = (mdiv >> DPIO_M1DIV_SHIFT) & 7;
 	clock.m2 = mdiv & DPIO_M2DIV_MASK;
@@ -7524,13 +7524,13 @@ static void chv_crtc_clock_get(struct intel_crtc *crtc,
 	if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
 		return;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	cmn_dw13 = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW13(port));
 	pll_dw0 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW0(port));
 	pll_dw1 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW1(port));
 	pll_dw2 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW2(port));
 	pll_dw3 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	clock.m1 = (pll_dw1 & 0x7) == DPIO_CHV_M1_DIV_BY_2 ? 2 : 0;
 	clock.m2 = (pll_dw0 & 0xff) << 22;
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 68229f53d5b8..0e9fee9cf76a 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2771,12 +2771,12 @@ static void chv_post_disable_dp(struct intel_encoder *encoder,
 
 	intel_dp_link_down(encoder, old_crtc_state);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* Assert data lane reset */
 	chv_data_lane_soft_reset(encoder, old_crtc_state, true);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 static void
diff --git a/drivers/gpu/drm/i915/intel_dpio_phy.c b/drivers/gpu/drm/i915/intel_dpio_phy.c
index 76473e9836c6..cd06fc206610 100644
--- a/drivers/gpu/drm/i915/intel_dpio_phy.c
+++ b/drivers/gpu/drm/i915/intel_dpio_phy.c
@@ -645,7 +645,7 @@ void chv_set_phy_signal_level(struct intel_encoder *encoder,
 	u32 val;
 	int i;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* Clear calc init */
 	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch));
@@ -726,8 +726,7 @@ void chv_set_phy_signal_level(struct intel_encoder *encoder,
 		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW10(ch), val);
 	}
 
-	mutex_unlock(&dev_priv->sb_lock);
-
+	vlv_sideband_put(dev_priv);
 }
 
 void chv_data_lane_soft_reset(struct intel_encoder *encoder,
@@ -797,7 +796,7 @@ void chv_phy_pre_pll_enable(struct intel_encoder *encoder,
 
 	chv_phy_powergate_lanes(encoder, true, lane_mask);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* Assert data lane reset */
 	chv_data_lane_soft_reset(encoder, crtc_state, true);
@@ -852,7 +851,7 @@ void chv_phy_pre_pll_enable(struct intel_encoder *encoder,
 		val |= CHV_CMN_USEDCLKCHANNEL;
 	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW19(ch), val);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 void chv_phy_pre_encoder_enable(struct intel_encoder *encoder,
@@ -867,7 +866,7 @@ void chv_phy_pre_encoder_enable(struct intel_encoder *encoder,
 	int data, i, stagger;
 	u32 val;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* allow hardware to manage TX FIFO reset source */
 	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW11(ch));
@@ -932,7 +931,7 @@ void chv_phy_pre_encoder_enable(struct intel_encoder *encoder,
 	/* Deassert data lane reset */
 	chv_data_lane_soft_reset(encoder, crtc_state, false);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 void chv_phy_release_cl2_override(struct intel_encoder *encoder)
@@ -953,7 +952,7 @@ void chv_phy_post_pll_disable(struct intel_encoder *encoder,
 	enum pipe pipe = to_intel_crtc(old_crtc_state->base.crtc)->pipe;
 	u32 val;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* disable left/right clock distribution */
 	if (pipe != PIPE_B) {
@@ -966,7 +965,7 @@ void chv_phy_post_pll_disable(struct intel_encoder *encoder,
 		vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW1_CH1, val);
 	}
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	/*
 	 * Leave the power down bit cleared for at least one
@@ -990,7 +989,7 @@ void vlv_set_phy_signal_level(struct intel_encoder *encoder,
 	enum dpio_channel port = vlv_dport_to_channel(dport);
 	enum pipe pipe = intel_crtc->pipe;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), 0x00000000);
 	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW4(port), demph_reg_value);
 	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW2(port),
@@ -1003,7 +1002,7 @@ void vlv_set_phy_signal_level(struct intel_encoder *encoder,
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW11(port), 0x00030000);
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW9(port), preemph_reg_value);
 	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), DPIO_TX_OCALINIT_EN);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 void vlv_phy_pre_pll_enable(struct intel_encoder *encoder,
@@ -1016,7 +1015,7 @@ void vlv_phy_pre_pll_enable(struct intel_encoder *encoder,
 	enum pipe pipe = crtc->pipe;
 
 	/* Program Tx lane resets to default */
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(port),
 			 DPIO_PCS_TX_LANE2_RESET |
 			 DPIO_PCS_TX_LANE1_RESET);
@@ -1030,7 +1029,7 @@ void vlv_phy_pre_pll_enable(struct intel_encoder *encoder,
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW12(port), 0x00750f00);
 	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW11(port), 0x00001500);
 	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW14(port), 0x40400000);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 void vlv_phy_pre_encoder_enable(struct intel_encoder *encoder,
@@ -1044,7 +1043,7 @@ void vlv_phy_pre_encoder_enable(struct intel_encoder *encoder,
 	enum pipe pipe = crtc->pipe;
 	u32 val;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* Enable clock channels for this port */
 	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(port));
@@ -1060,7 +1059,7 @@ void vlv_phy_pre_encoder_enable(struct intel_encoder *encoder,
 	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->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 void vlv_phy_reset_lanes(struct intel_encoder *encoder,
@@ -1072,8 +1071,8 @@ void vlv_phy_reset_lanes(struct intel_encoder *encoder,
 	enum dpio_channel port = vlv_dport_to_channel(dport);
 	enum pipe pipe = crtc->pipe;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	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->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index f67d321376e4..b78617722249 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -278,7 +278,7 @@ static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,
 
 static void band_gap_reset(struct drm_i915_private *dev_priv)
 {
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	vlv_flisdsi_write(dev_priv, 0x08, 0x0001);
 	vlv_flisdsi_write(dev_priv, 0x0F, 0x0005);
@@ -287,7 +287,7 @@ static void band_gap_reset(struct drm_i915_private *dev_priv)
 	vlv_flisdsi_write(dev_priv, 0x0F, 0x0000);
 	vlv_flisdsi_write(dev_priv, 0x08, 0x0000);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 static inline bool is_vid_mode(struct intel_dsi *intel_dsi)
@@ -509,11 +509,11 @@ static void vlv_dsi_device_ready(struct intel_encoder *encoder)
 
 	DRM_DEBUG_KMS("\n");
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	/* program rcomp for compliance, reduce from 50 ohms to 45 ohms
 	 * needed everytime after power gate */
 	vlv_flisdsi_write(dev_priv, 0x04, 0x0004);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	/* bandgap reset is needed after everytime we do power gate */
 	band_gap_reset(dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c
index 2ff2ee7f3b78..bcbecad7f8f9 100644
--- a/drivers/gpu/drm/i915/intel_dsi_pll.c
+++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
@@ -149,7 +149,7 @@ static void vlv_enable_dsi_pll(struct intel_encoder *encoder,
 
 	DRM_DEBUG_KMS("\n");
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0);
 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_DIVIDER, config->dsi_pll.div);
@@ -166,11 +166,11 @@ static void vlv_enable_dsi_pll(struct intel_encoder *encoder,
 	if (wait_for(vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL) &
 						DSI_PLL_LOCK, 20)) {
 
-		mutex_unlock(&dev_priv->sb_lock);
+		vlv_sideband_put(dev_priv);
 		DRM_ERROR("DSI PLL lock failed\n");
 		return;
 	}
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	DRM_DEBUG_KMS("DSI PLL locked\n");
 }
@@ -182,14 +182,14 @@ static void vlv_disable_dsi_pll(struct intel_encoder *encoder)
 
 	DRM_DEBUG_KMS("\n");
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
 	tmp &= ~DSI_PLL_VCO_EN;
 	tmp |= DSI_PLL_LDO_GATE;
 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 static bool bxt_dsi_pll_is_enabled(struct drm_i915_private *dev_priv)
@@ -274,10 +274,10 @@ static u32 vlv_dsi_get_pclk(struct intel_encoder *encoder, int pipe_bpp,
 
 	DRM_DEBUG_KMS("\n");
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	pll_ctl = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
 	pll_div = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_DIVIDER);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	config->dsi_pll.ctrl = pll_ctl & ~DSI_PLL_LOCK;
 	config->dsi_pll.div = pll_div;
diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c
index 91c07b0c8db9..72ddc215b7a9 100644
--- a/drivers/gpu/drm/i915/intel_dsi_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c
@@ -234,7 +234,7 @@ static void vlv_exec_gpio(struct drm_i915_private *dev_priv,
 	pconf0 = VLV_GPIO_PCONF0(map->base_offset);
 	padval = VLV_GPIO_PAD_VAL(map->base_offset);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	if (!map->init) {
 		/* FIXME: remove constant below */
 		vlv_iosf_sb_write(dev_priv, port, pconf0, 0x2000CC00);
@@ -243,7 +243,7 @@ static void vlv_exec_gpio(struct drm_i915_private *dev_priv,
 
 	tmp = 0x4 | value;
 	vlv_iosf_sb_write(dev_priv, port, padval, tmp);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 static void chv_exec_gpio(struct drm_i915_private *dev_priv,
@@ -289,12 +289,12 @@ static void chv_exec_gpio(struct drm_i915_private *dev_priv,
 	cfg0 = CHV_GPIO_PAD_CFG0(family_num, gpio_index);
 	cfg1 = CHV_GPIO_PAD_CFG1(family_num, gpio_index);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	vlv_iosf_sb_write(dev_priv, port, cfg1, 0);
 	vlv_iosf_sb_write(dev_priv, port, cfg0,
 			  CHV_GPIO_GPIOEN | CHV_GPIO_GPIOCFG_GPO |
 			  CHV_GPIO_GPIOTXSTATE(value));
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 static void bxt_exec_gpio(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 691f15b59124..fbcd2848acdf 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1995,12 +1995,12 @@ static void chv_hdmi_post_disable(struct intel_encoder *encoder,
 	struct drm_device *dev = encoder->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* Assert data lane reset */
 	chv_data_lane_soft_reset(encoder, old_crtc_state, true);
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 }
 
 static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1db79a860b96..ee6a87afcfe0 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7173,9 +7173,9 @@ static void cherryview_init_gt_powersave(struct drm_i915_private *dev_priv)
 
 	vlv_init_gpll_ref_freq(dev_priv);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	val = vlv_cck_read(dev_priv, CCK_FUSE_REG);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	switch ((val >> 2) & 0x7) {
 	case 3:
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 4996c4ea8a80..08b1a6d69b55 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -1182,7 +1182,7 @@ static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 				    1))
 		DRM_ERROR("Display PHY %d is not power up\n", phy);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 
 	/* Enable dynamic power down */
 	tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW28);
@@ -1205,7 +1205,7 @@ static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 		vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, tmp);
 	}
 
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy);
 	I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
@@ -1268,9 +1268,9 @@ static void assert_chv_phy_powergate(struct drm_i915_private *dev_priv, enum dpi
 	else
 		reg = _CHV_CMN_DW6_CH1;
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	val = vlv_dpio_read(dev_priv, pipe, reg);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	/*
 	 * This assumes !override is only used when the port is disabled.
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
index 02bdd2e2cef6..8d1dc38764d0 100644
--- a/drivers/gpu/drm/i915/intel_sideband.c
+++ b/drivers/gpu/drm/i915/intel_sideband.c
@@ -45,6 +45,27 @@ static void ping(void *info)
 {
 }
 
+void vlv_sideband_get(struct drm_i915_private *dev_priv)
+{
+	/*
+	 * Prevent the cpu from sleeping while we use this sideband, otherwise
+	 * the punit may cause a machine hang.
+	 */
+	pm_qos_update_request(&dev_priv->sb_qos, 0);
+	on_each_cpu(ping, NULL, 1);
+
+	iosf_mbi_punit_acquire();
+	mutex_lock(&dev_priv->sb_lock);
+}
+
+void vlv_sideband_put(struct drm_i915_private *dev_priv)
+{
+	mutex_unlock(&dev_priv->sb_lock);
+	iosf_mbi_punit_release();
+
+	pm_qos_update_request(&dev_priv->sb_qos, PM_QOS_DEFAULT_VALUE);
+}
+
 static int vlv_sideband_rw(struct drm_i915_private *dev_priv,
 			   u32 devfn, u32 port, u32 opcode,
 			   u32 addr, u32 *val)
@@ -53,6 +74,7 @@ static int vlv_sideband_rw(struct drm_i915_private *dev_priv,
 	int err;
 
 	lockdep_assert_held(&dev_priv->sb_lock);
+	iosf_mbi_assert_punit_acquired();
 
 	/* Flush the previous comms, just in case it failed last time. */
 	if (intel_wait_for_register(dev_priv,
@@ -63,14 +85,6 @@ static int vlv_sideband_rw(struct drm_i915_private *dev_priv,
 		return -EAGAIN;
 	}
 
-	iosf_mbi_punit_acquire();
-
-	/*
-	 * Prevent the cpu from sleeping while we use this sideband, otherwise
-	 * the punit may cause a machine hang.
-	 */
-	pm_qos_update_request(&dev_priv->sb_qos, 0);
-	on_each_cpu(ping, NULL, 1);
 	preempt_disable();
 
 	I915_WRITE_FW(VLV_IOSF_ADDR, addr);
@@ -96,8 +110,6 @@ static int vlv_sideband_rw(struct drm_i915_private *dev_priv,
 	}
 
 	preempt_enable();
-	pm_qos_update_request(&dev_priv->sb_qos, PM_QOS_DEFAULT_VALUE);
-	iosf_mbi_punit_release();
 
 	return err;
 }
@@ -106,12 +118,12 @@ u32 vlv_punit_read(struct drm_i915_private *dev_priv, u32 addr)
 {
 	u32 val = 0;
 
-	WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
+	lockdep_assert_held(&dev_priv->pcu_lock);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
 			SB_CRRDDA_NP, addr, &val);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	return val;
 }
@@ -120,12 +132,12 @@ int vlv_punit_write(struct drm_i915_private *dev_priv, u32 addr, u32 val)
 {
 	int err;
 
-	WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
+	lockdep_assert_held(&dev_priv->pcu_lock);
 
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	err = vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
 			      SB_CRWRDA_NP, addr, &val);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	return err;
 }
@@ -150,12 +162,10 @@ u32 vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr)
 {
 	u32 val = 0;
 
-	WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
-
-	mutex_lock(&dev_priv->sb_lock);
+	vlv_sideband_get(dev_priv);
 	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_NC,
 			SB_CRRDDA_NP, addr, &val);
-	mutex_unlock(&dev_priv->sb_lock);
+	vlv_sideband_put(dev_priv);
 
 	return val;
 }
@@ -231,7 +241,8 @@ u32 intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg,
 		   enum intel_sbi_destination destination)
 {
 	u32 value = 0;
-	WARN_ON(!mutex_is_locked(&dev_priv->sb_lock));
+
+	lockdep_assert_held(&dev_priv->sb_lock);
 
 	if (intel_wait_for_register(dev_priv,
 				    SBI_CTL_STAT, SBI_BUSY, 0,
@@ -271,7 +282,7 @@ void intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,
 {
 	u32 tmp;
 
-	WARN_ON(!mutex_is_locked(&dev_priv->sb_lock));
+	lockdep_assert_held(&dev_priv->sb_lock);
 
 	if (intel_wait_for_register(dev_priv,
 				    SBI_CTL_STAT, SBI_BUSY, 0,
-- 
2.15.1



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