diff mbox series

drm/i915/display/vlv: use intel_de_rmw if possible

Message ID 20221216092356.3336893-1-andrzej.hajda@intel.com (mailing list archive)
State New, archived
Headers show
Series drm/i915/display/vlv: use intel_de_rmw if possible | expand

Commit Message

Andrzej Hajda Dec. 16, 2022, 9:23 a.m. UTC 
The helper makes the code more compact and readable.

Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com>
---
Hi all,

Here is another set of refactoring read/modify/write registers.
I have split it to smaller chunks to make the review and patch preparation
process less painful - cocci script do the most importan work, but
there are many small improvements, style corrections performed by hand.

Regards
Andrzej
---

 drivers/gpu/drm/i915/display/vlv_dsi.c     | 157 ++++++---------------
 drivers/gpu/drm/i915/display/vlv_dsi_pll.c |  18 +--
 2 files changed, 51 insertions(+), 124 deletions(-)

Comments

Jani Nikula Dec. 16, 2022, 11:15 a.m. UTC | #1 
On Fri, 16 Dec 2022, Andrzej Hajda <andrzej.hajda@intel.com> wrote:
> The helper makes the code more compact and readable.
>
> Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com>

[snip]

> @@ -649,23 +611,18 @@ static void intel_dsi_port_enable(struct intel_encoder *encoder,
>  	enum port port;
>  
>  	if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
> -		u32 temp;
> +		u32 temp = intel_dsi->pixel_overlap;
>  		if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
> -			for_each_dsi_port(port, intel_dsi->ports) {
> -				temp = intel_de_read(dev_priv,
> -						     MIPI_CTRL(port));
> -				temp &= ~BXT_PIXEL_OVERLAP_CNT_MASK |
> -					intel_dsi->pixel_overlap <<
> -					BXT_PIXEL_OVERLAP_CNT_SHIFT;

This can't possibly be correct to begin with.

I think it's supposed to be the logical

	temp &= ~BXT_PIXEL_OVERLAP_CNT_MASK;
        temp |= intel_dsi->pixel_overlap << BXT_PIXEL_OVERLAP_CNT_SHIFT;

Nothing else makes sense, really.

I think I'd just fix that in a separate patch first, and then do the rmw
changes on top.

> -				intel_de_write(dev_priv, MIPI_CTRL(port),
> -					       temp);
> -			}
> +			for_each_dsi_port(port, intel_dsi->ports)
> +				intel_de_rmw(dev_priv, MIPI_CTRL(port),
> +					     BXT_PIXEL_OVERLAP_CNT_MASK &
> +					     ~(temp << BXT_PIXEL_OVERLAP_CNT_SHIFT),
> +					     0);
>  		} else {
> -			temp = intel_de_read(dev_priv, VLV_CHICKEN_3);
> -			temp &= ~PIXEL_OVERLAP_CNT_MASK |
> -					intel_dsi->pixel_overlap <<
> -					PIXEL_OVERLAP_CNT_SHIFT;
> -			intel_de_write(dev_priv, VLV_CHICKEN_3, temp);

Ditto here.

> +			intel_de_rmw(dev_priv, VLV_CHICKEN_3,
> +				     PIXEL_OVERLAP_CNT_MASK &
> +				     ~(temp << PIXEL_OVERLAP_CNT_SHIFT),
> +				     0);
>  		}
>  	}
>  

Everything else in the patch checks out. With the above split out and
the rmw rebased,

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c
index 662bdb656aa304..7ab69bc6b49477 100644
--- a/drivers/gpu/drm/i915/display/vlv_dsi.c
+++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
@@ -331,32 +331,23 @@  static bool glk_dsi_enable_io(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
-	u32 tmp;
 	bool cold_boot = false;
 
 	/* Set the MIPI mode
 	 * If MIPI_Mode is off, then writing to LP_Wake bit is not reflecting.
 	 * Power ON MIPI IO first and then write into IO reset and LP wake bits
 	 */
-	for_each_dsi_port(port, intel_dsi->ports) {
-		tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
-		intel_de_write(dev_priv, MIPI_CTRL(port),
-			       tmp | GLK_MIPIIO_ENABLE);
-	}
+	for_each_dsi_port(port, intel_dsi->ports)
+		intel_de_rmw(dev_priv, MIPI_CTRL(port), 0, GLK_MIPIIO_ENABLE);
 
 	/* Put the IO into reset */
-	tmp = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
-	tmp &= ~GLK_MIPIIO_RESET_RELEASED;
-	intel_de_write(dev_priv, MIPI_CTRL(PORT_A), tmp);
+	intel_de_rmw(dev_priv, MIPI_CTRL(PORT_A), GLK_MIPIIO_RESET_RELEASED, 0);
 
 	/* Program LP Wake */
 	for_each_dsi_port(port, intel_dsi->ports) {
-		tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
-		if (!(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY))
-			tmp &= ~GLK_LP_WAKE;
-		else
-			tmp |= GLK_LP_WAKE;
-		intel_de_write(dev_priv, MIPI_CTRL(port), tmp);
+		u32 tmp = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
+		intel_de_rmw(dev_priv, MIPI_CTRL(port),
+			     GLK_LP_WAKE, (tmp & DEVICE_READY) ? GLK_LP_WAKE : 0);
 	}
 
 	/* Wait for Pwr ACK */
@@ -380,7 +371,6 @@  static void glk_dsi_device_ready(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
-	u32 val;
 
 	/* Wait for MIPI PHY status bit to set */
 	for_each_dsi_port(port, intel_dsi->ports) {
@@ -390,24 +380,18 @@  static void glk_dsi_device_ready(struct intel_encoder *encoder)
 	}
 
 	/* Get IO out of reset */
-	val = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
-	intel_de_write(dev_priv, MIPI_CTRL(PORT_A),
-		       val | GLK_MIPIIO_RESET_RELEASED);
+	intel_de_rmw(dev_priv, MIPI_CTRL(PORT_A), 0, GLK_MIPIIO_RESET_RELEASED);
 
 	/* Get IO out of Low power state*/
 	for_each_dsi_port(port, intel_dsi->ports) {
 		if (!(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY)) {
-			val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
-			val &= ~ULPS_STATE_MASK;
-			val |= DEVICE_READY;
-			intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
+			intel_de_rmw(dev_priv, MIPI_DEVICE_READY(port),
+				     ULPS_STATE_MASK, DEVICE_READY);
 			usleep_range(10, 15);
 		} else {
 			/* Enter ULPS */
-			val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
-			val &= ~ULPS_STATE_MASK;
-			val |= (ULPS_STATE_ENTER | DEVICE_READY);
-			intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
+			intel_de_rmw(dev_priv, MIPI_DEVICE_READY(port),
+				     ULPS_STATE_MASK, ULPS_STATE_ENTER | DEVICE_READY);
 
 			/* Wait for ULPS active */
 			if (intel_de_wait_for_clear(dev_priv, MIPI_CTRL(port),
@@ -415,20 +399,15 @@  static void glk_dsi_device_ready(struct intel_encoder *encoder)
 				drm_err(&dev_priv->drm, "ULPS not active\n");
 
 			/* Exit ULPS */
-			val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
-			val &= ~ULPS_STATE_MASK;
-			val |= (ULPS_STATE_EXIT | DEVICE_READY);
-			intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
+			intel_de_rmw(dev_priv, MIPI_DEVICE_READY(port),
+				     ULPS_STATE_MASK, ULPS_STATE_EXIT | DEVICE_READY);
 
 			/* Enter Normal Mode */
-			val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
-			val &= ~ULPS_STATE_MASK;
-			val |= (ULPS_STATE_NORMAL_OPERATION | DEVICE_READY);
-			intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
-
-			val = intel_de_read(dev_priv, MIPI_CTRL(port));
-			val &= ~GLK_LP_WAKE;
-			intel_de_write(dev_priv, MIPI_CTRL(port), val);
+			intel_de_rmw(dev_priv, MIPI_DEVICE_READY(port),
+				     ULPS_STATE_MASK,
+				     ULPS_STATE_NORMAL_OPERATION | DEVICE_READY);
+
+			intel_de_rmw(dev_priv, MIPI_CTRL(port), GLK_LP_WAKE, 0);
 		}
 	}
 
@@ -460,9 +439,7 @@  static void bxt_dsi_device_ready(struct intel_encoder *encoder)
 
 	/* Enable MIPI PHY transparent latch */
 	for_each_dsi_port(port, intel_dsi->ports) {
-		val = intel_de_read(dev_priv, BXT_MIPI_PORT_CTRL(port));
-		intel_de_write(dev_priv, BXT_MIPI_PORT_CTRL(port),
-			       val | LP_OUTPUT_HOLD);
+		intel_de_rmw(dev_priv, BXT_MIPI_PORT_CTRL(port), 0, LP_OUTPUT_HOLD);
 		usleep_range(2000, 2500);
 	}
 
@@ -482,7 +459,6 @@  static void vlv_dsi_device_ready(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
-	u32 val;
 
 	drm_dbg_kms(&dev_priv->drm, "\n");
 
@@ -505,9 +481,7 @@  static void vlv_dsi_device_ready(struct intel_encoder *encoder)
 		 * Common bit for both MIPI Port A & MIPI Port C
 		 * No similar bit in MIPI Port C reg
 		 */
-		val = intel_de_read(dev_priv, MIPI_PORT_CTRL(PORT_A));
-		intel_de_write(dev_priv, MIPI_PORT_CTRL(PORT_A),
-			       val | LP_OUTPUT_HOLD);
+		intel_de_rmw(dev_priv, MIPI_PORT_CTRL(PORT_A), 0, LP_OUTPUT_HOLD);
 		usleep_range(1000, 1500);
 
 		intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
@@ -537,15 +511,11 @@  static void glk_dsi_enter_low_power_mode(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
-	u32 val;
 
 	/* Enter ULPS */
-	for_each_dsi_port(port, intel_dsi->ports) {
-		val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
-		val &= ~ULPS_STATE_MASK;
-		val |= (ULPS_STATE_ENTER | DEVICE_READY);
-		intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
-	}
+	for_each_dsi_port(port, intel_dsi->ports)
+		intel_de_rmw(dev_priv, MIPI_DEVICE_READY(port),
+			     ULPS_STATE_MASK, ULPS_STATE_ENTER | DEVICE_READY);
 
 	/* Wait for MIPI PHY status bit to unset */
 	for_each_dsi_port(port, intel_dsi->ports) {
@@ -568,12 +538,9 @@  static void glk_dsi_disable_mipi_io(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
-	u32 tmp;
 
 	/* Put the IO into reset */
-	tmp = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
-	tmp &= ~GLK_MIPIIO_RESET_RELEASED;
-	intel_de_write(dev_priv, MIPI_CTRL(PORT_A), tmp);
+	intel_de_rmw(dev_priv, MIPI_CTRL(PORT_A), GLK_MIPIIO_RESET_RELEASED, 0);
 
 	/* Wait for MIPI PHY status bit to unset */
 	for_each_dsi_port(port, intel_dsi->ports) {
@@ -583,11 +550,8 @@  static void glk_dsi_disable_mipi_io(struct intel_encoder *encoder)
 	}
 
 	/* Clear MIPI mode */
-	for_each_dsi_port(port, intel_dsi->ports) {
-		tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
-		tmp &= ~GLK_MIPIIO_ENABLE;
-		intel_de_write(dev_priv, MIPI_CTRL(port), tmp);
-	}
+	for_each_dsi_port(port, intel_dsi->ports)
+		intel_de_rmw(dev_priv, MIPI_CTRL(port), GLK_MIPIIO_ENABLE, 0);
 }
 
 static void glk_dsi_clear_device_ready(struct intel_encoder *encoder)
@@ -607,7 +571,6 @@  static void vlv_dsi_clear_device_ready(struct intel_encoder *encoder)
 		/* Common bit for both MIPI Port A & MIPI Port C on VLV/CHV */
 		i915_reg_t port_ctrl = IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv) ?
 			BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(PORT_A);
-		u32 val;
 
 		intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 			       DEVICE_READY | ULPS_STATE_ENTER);
@@ -631,8 +594,7 @@  static void vlv_dsi_clear_device_ready(struct intel_encoder *encoder)
 			drm_err(&dev_priv->drm, "DSI LP not going Low\n");
 
 		/* Disable MIPI PHY transparent latch */
-		val = intel_de_read(dev_priv, port_ctrl);
-		intel_de_write(dev_priv, port_ctrl, val & ~LP_OUTPUT_HOLD);
+		intel_de_rmw(dev_priv, port_ctrl, LP_OUTPUT_HOLD, 0);
 		usleep_range(1000, 1500);
 
 		intel_de_write(dev_priv, MIPI_DEVICE_READY(port), 0x00);
@@ -649,23 +611,18 @@  static void intel_dsi_port_enable(struct intel_encoder *encoder,
 	enum port port;
 
 	if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
-		u32 temp;
+		u32 temp = intel_dsi->pixel_overlap;
 		if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
-			for_each_dsi_port(port, intel_dsi->ports) {
-				temp = intel_de_read(dev_priv,
-						     MIPI_CTRL(port));
-				temp &= ~BXT_PIXEL_OVERLAP_CNT_MASK |
-					intel_dsi->pixel_overlap <<
-					BXT_PIXEL_OVERLAP_CNT_SHIFT;
-				intel_de_write(dev_priv, MIPI_CTRL(port),
-					       temp);
-			}
+			for_each_dsi_port(port, intel_dsi->ports)
+				intel_de_rmw(dev_priv, MIPI_CTRL(port),
+					     BXT_PIXEL_OVERLAP_CNT_MASK &
+					     ~(temp << BXT_PIXEL_OVERLAP_CNT_SHIFT),
+					     0);
 		} else {
-			temp = intel_de_read(dev_priv, VLV_CHICKEN_3);
-			temp &= ~PIXEL_OVERLAP_CNT_MASK |
-					intel_dsi->pixel_overlap <<
-					PIXEL_OVERLAP_CNT_SHIFT;
-			intel_de_write(dev_priv, VLV_CHICKEN_3, temp);
+			intel_de_rmw(dev_priv, VLV_CHICKEN_3,
+				     PIXEL_OVERLAP_CNT_MASK &
+				     ~(temp << PIXEL_OVERLAP_CNT_SHIFT),
+				     0);
 		}
 	}
 
@@ -709,11 +666,9 @@  static void intel_dsi_port_disable(struct intel_encoder *encoder)
 	for_each_dsi_port(port, intel_dsi->ports) {
 		i915_reg_t port_ctrl = IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv) ?
 			BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
-		u32 temp;
 
 		/* de-assert ip_tg_enable signal */
-		temp = intel_de_read(dev_priv, port_ctrl);
-		intel_de_write(dev_priv, port_ctrl, temp & ~DPI_ENABLE);
+		intel_de_rmw(dev_priv, port_ctrl, DPI_ENABLE, 0);
 		intel_de_posting_read(dev_priv, port_ctrl);
 	}
 }
@@ -787,7 +742,6 @@  static void intel_dsi_pre_enable(struct intel_atomic_state *state,
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	enum pipe pipe = crtc->pipe;
 	enum port port;
-	u32 val;
 	bool glk_cold_boot = false;
 
 	drm_dbg_kms(&dev_priv->drm, "\n");
@@ -810,9 +764,7 @@  static void intel_dsi_pre_enable(struct intel_atomic_state *state,
 
 	if (IS_BROXTON(dev_priv)) {
 		/* Add MIPI IO reset programming for modeset */
-		val = intel_de_read(dev_priv, BXT_P_CR_GT_DISP_PWRON);
-		intel_de_write(dev_priv, BXT_P_CR_GT_DISP_PWRON,
-			       val | MIPIO_RST_CTRL);
+		intel_de_rmw(dev_priv, BXT_P_CR_GT_DISP_PWRON, 0, MIPIO_RST_CTRL);
 
 		/* Power up DSI regulator */
 		intel_de_write(dev_priv, BXT_P_DSI_REGULATOR_CFG, STAP_SELECT);
@@ -820,12 +772,9 @@  static void intel_dsi_pre_enable(struct intel_atomic_state *state,
 	}
 
 	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
-		u32 val;
-
 		/* Disable DPOunit clock gating, can stall pipe */
-		val = intel_de_read(dev_priv, DSPCLK_GATE_D(dev_priv));
-		val |= DPOUNIT_CLOCK_GATE_DISABLE;
-		intel_de_write(dev_priv, DSPCLK_GATE_D(dev_priv), val);
+		intel_de_rmw(dev_priv, DSPCLK_GATE_D(dev_priv),
+			     0, DPOUNIT_CLOCK_GATE_DISABLE);
 	}
 
 	if (!IS_GEMINILAKE(dev_priv))
@@ -949,7 +898,6 @@  static void intel_dsi_post_disable(struct intel_atomic_state *state,
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
-	u32 val;
 
 	drm_dbg_kms(&dev_priv->drm, "\n");
 
@@ -987,21 +935,16 @@  static void intel_dsi_post_disable(struct intel_atomic_state *state,
 			       HS_IO_CTRL_SELECT);
 
 		/* Add MIPI IO reset programming for modeset */
-		val = intel_de_read(dev_priv, BXT_P_CR_GT_DISP_PWRON);
-		intel_de_write(dev_priv, BXT_P_CR_GT_DISP_PWRON,
-			       val & ~MIPIO_RST_CTRL);
+		intel_de_rmw(dev_priv, BXT_P_CR_GT_DISP_PWRON, MIPIO_RST_CTRL, 0);
 	}
 
 	if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
 		bxt_dsi_pll_disable(encoder);
 	} else {
-		u32 val;
-
 		vlv_dsi_pll_disable(encoder);
 
-		val = intel_de_read(dev_priv, DSPCLK_GATE_D(dev_priv));
-		val &= ~DPOUNIT_CLOCK_GATE_DISABLE;
-		intel_de_write(dev_priv, DSPCLK_GATE_D(dev_priv), val);
+		intel_de_rmw(dev_priv, DSPCLK_GATE_D(dev_priv),
+			     DPOUNIT_CLOCK_GATE_DISABLE, 0);
 	}
 
 	/* Assert reset */
@@ -1432,11 +1375,8 @@  static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
 		} else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
 			enum pipe pipe = crtc->pipe;
 
-			tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
-			tmp &= ~BXT_PIPE_SELECT_MASK;
-
-			tmp |= BXT_PIPE_SELECT(pipe);
-			intel_de_write(dev_priv, MIPI_CTRL(port), tmp);
+			intel_de_rmw(dev_priv, MIPI_CTRL(port),
+				     BXT_PIPE_SELECT_MASK, BXT_PIPE_SELECT(pipe));
 		}
 
 		/* XXX: why here, why like this? handling in irq handler?! */
@@ -1605,7 +1545,6 @@  static void intel_dsi_unprepare(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
-	u32 val;
 
 	if (IS_GEMINILAKE(dev_priv))
 		return;
@@ -1620,9 +1559,7 @@  static void intel_dsi_unprepare(struct intel_encoder *encoder)
 			vlv_dsi_reset_clocks(encoder, port);
 		intel_de_write(dev_priv, MIPI_EOT_DISABLE(port), CLOCKSTOP);
 
-		val = intel_de_read(dev_priv, MIPI_DSI_FUNC_PRG(port));
-		val &= ~VID_MODE_FORMAT_MASK;
-		intel_de_write(dev_priv, MIPI_DSI_FUNC_PRG(port), val);
+		intel_de_rmw(dev_priv, MIPI_DSI_FUNC_PRG(port), VID_MODE_FORMAT_MASK, 0);
 
 		intel_de_write(dev_priv, MIPI_DEVICE_READY(port), 0x1);
 	}
diff --git a/drivers/gpu/drm/i915/display/vlv_dsi_pll.c b/drivers/gpu/drm/i915/display/vlv_dsi_pll.c
index af7402127cd99a..b697badbbe7110 100644
--- a/drivers/gpu/drm/i915/display/vlv_dsi_pll.c
+++ b/drivers/gpu/drm/i915/display/vlv_dsi_pll.c
@@ -302,13 +302,10 @@  bool bxt_dsi_pll_is_enabled(struct drm_i915_private *dev_priv)
 void bxt_dsi_pll_disable(struct intel_encoder *encoder)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
-	u32 val;
 
 	drm_dbg_kms(&dev_priv->drm, "\n");
 
-	val = intel_de_read(dev_priv, BXT_DSI_PLL_ENABLE);
-	val &= ~BXT_DSI_PLL_DO_ENABLE;
-	intel_de_write(dev_priv, BXT_DSI_PLL_ENABLE, val);
+	intel_de_rmw(dev_priv, BXT_DSI_PLL_ENABLE, BXT_DSI_PLL_DO_ENABLE, 0);
 
 	/*
 	 * PLL lock should deassert within 200us.
@@ -542,7 +539,6 @@  void bxt_dsi_pll_enable(struct intel_encoder *encoder,
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
-	u32 val;
 
 	drm_dbg_kms(&dev_priv->drm, "\n");
 
@@ -559,9 +555,7 @@  void bxt_dsi_pll_enable(struct intel_encoder *encoder,
 	}
 
 	/* Enable DSI PLL */
-	val = intel_de_read(dev_priv, BXT_DSI_PLL_ENABLE);
-	val |= BXT_DSI_PLL_DO_ENABLE;
-	intel_de_write(dev_priv, BXT_DSI_PLL_ENABLE, val);
+	intel_de_rmw(dev_priv, BXT_DSI_PLL_ENABLE, 0, BXT_DSI_PLL_DO_ENABLE);
 
 	/* Timeout and fail if PLL not locked */
 	if (intel_de_wait_for_set(dev_priv, BXT_DSI_PLL_ENABLE,
@@ -589,13 +583,9 @@  void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
 		tmp &= ~(BXT_MIPI_RX_ESCLK_LOWER_FIXDIV_MASK(port));
 		intel_de_write(dev_priv, BXT_MIPI_CLOCK_CTL, tmp);
 	} else {
-		tmp = intel_de_read(dev_priv, MIPIO_TXESC_CLK_DIV1);
-		tmp &= ~GLK_TX_ESC_CLK_DIV1_MASK;
-		intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV1, tmp);
+		intel_de_rmw(dev_priv, MIPIO_TXESC_CLK_DIV1, GLK_TX_ESC_CLK_DIV1_MASK, 0);
 
-		tmp = intel_de_read(dev_priv, MIPIO_TXESC_CLK_DIV2);
-		tmp &= ~GLK_TX_ESC_CLK_DIV2_MASK;
-		intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV2, tmp);
+		intel_de_rmw(dev_priv, MIPIO_TXESC_CLK_DIV2, GLK_TX_ESC_CLK_DIV2_MASK, 0);
 	}
 	intel_de_write(dev_priv, MIPI_EOT_DISABLE(port), CLOCKSTOP);
 }