drm/i915: Move the IPS code to its own file

IPS is a pretty well isolated feature. Move the relevant code
to a separate file from polluting intel_display.c.

I stuck to the hsw_ips name since that's what the function were
already using, and also to avoid confusion with the ILK
"Intelligen Power Sharing"/intel_ips GPU turbo stuff.

And let's also do the s/dev_priv/i915/ rename while touching
most of the code.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220209113526.7595-4-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/Makefile

@@ -198,6 +198,7 @@ i915-y += gt/uc/intel_uc.o \
 
 # modesetting core code
 i915-y += \
+	display/hsw_ips.o \
 	display/intel_atomic.o \
 	display/intel_atomic_plane.o \
 	display/intel_audio.o \

drivers/gpu/drm/i915/display/hsw_ips.c

@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "hsw_ips.h"
+#include "i915_drv.h"
+#include "i915_reg.h"
+#include "intel_de.h"
+#include "intel_display_types.h"
+#include "intel_pcode.h"
+
+static void hsw_ips_enable(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+
+	if (!crtc_state->ips_enabled)
+		return;
+
+	/*
+	 * We can only enable IPS after we enable a plane and wait for a vblank
+	 * This function is called from post_plane_update, which is run after
+	 * a vblank wait.
+	 */
+	drm_WARN_ON(&i915->drm,
+		    !(crtc_state->active_planes & ~BIT(PLANE_CURSOR)));
+
+	if (IS_BROADWELL(i915)) {
+		drm_WARN_ON(&i915->drm,
+			    snb_pcode_write(i915, DISPLAY_IPS_CONTROL,
+					    IPS_ENABLE | IPS_PCODE_CONTROL));
+		/*
+		 * Quoting Art Runyan: "its not safe to expect any particular
+		 * value in IPS_CTL bit 31 after enabling IPS through the
+		 * mailbox." Moreover, the mailbox may return a bogus state,
+		 * so we need to just enable it and continue on.
+		 */
+	} else {
+		intel_de_write(i915, IPS_CTL, IPS_ENABLE);
+		/*
+		 * The bit only becomes 1 in the next vblank, so this wait here
+		 * is essentially intel_wait_for_vblank. If we don't have this
+		 * and don't wait for vblanks until the end of crtc_enable, then
+		 * the HW state readout code will complain that the expected
+		 * IPS_CTL value is not the one we read.
+		 */
+		if (intel_de_wait_for_set(i915, IPS_CTL, IPS_ENABLE, 50))
+			drm_err(&i915->drm,
+				"Timed out waiting for IPS enable\n");
+	}
+}
+
+bool hsw_ips_disable(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	bool need_vblank_wait = false;
+
+	if (!crtc_state->ips_enabled)
+		return need_vblank_wait;
+
+	if (IS_BROADWELL(i915)) {
+		drm_WARN_ON(&i915->drm,
+			    snb_pcode_write(i915, DISPLAY_IPS_CONTROL, 0));
+		/*
+		 * Wait for PCODE to finish disabling IPS. The BSpec specified
+		 * 42ms timeout value leads to occasional timeouts so use 100ms
+		 * instead.
+		 */
+		if (intel_de_wait_for_clear(i915, IPS_CTL, IPS_ENABLE, 100))
+			drm_err(&i915->drm,
+				"Timed out waiting for IPS disable\n");
+	} else {
+		intel_de_write(i915, IPS_CTL, 0);
+		intel_de_posting_read(i915, IPS_CTL);
+	}
+
+	/* We need to wait for a vblank before we can disable the plane. */
+	need_vblank_wait = true;
+
+	return need_vblank_wait;
+}
+
+static bool hsw_ips_need_disable(struct intel_atomic_state *state,
+				 struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(state, crtc);
+	const struct intel_crtc_state *new_crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+
+	if (!old_crtc_state->ips_enabled)
+		return false;
+
+	if (intel_crtc_needs_modeset(new_crtc_state))
+		return true;
+
+	/*
+	 * Workaround : Do not read or write the pipe palette/gamma data while
+	 * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
+	 *
+	 * Disable IPS before we program the LUT.
+	 */
+	if (IS_HASWELL(i915) &&
+	    (new_crtc_state->uapi.color_mgmt_changed ||
+	     new_crtc_state->update_pipe) &&
+	    new_crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT)
+		return true;
+
+	return !new_crtc_state->ips_enabled;
+}
+
+bool hsw_ips_pre_update(struct intel_atomic_state *state,
+			struct intel_crtc *crtc)
+{
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(state, crtc);
+
+	if (!hsw_ips_need_disable(state, crtc))
+		return false;
+
+	return hsw_ips_disable(old_crtc_state);
+}
+
+static bool hsw_ips_need_enable(struct intel_atomic_state *state,
+				struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(state, crtc);
+	const struct intel_crtc_state *new_crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+
+	if (!new_crtc_state->ips_enabled)
+		return false;
+
+	if (intel_crtc_needs_modeset(new_crtc_state))
+		return true;
+
+	/*
+	 * Workaround : Do not read or write the pipe palette/gamma data while
+	 * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
+	 *
+	 * Re-enable IPS after the LUT has been programmed.
+	 */
+	if (IS_HASWELL(i915) &&
+	    (new_crtc_state->uapi.color_mgmt_changed ||
+	     new_crtc_state->update_pipe) &&
+	    new_crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT)
+		return true;
+
+	/*
+	 * We can't read out IPS on broadwell, assume the worst and
+	 * forcibly enable IPS on the first fastset.
+	 */
+	if (new_crtc_state->update_pipe && old_crtc_state->inherited)
+		return true;
+
+	return !old_crtc_state->ips_enabled;
+}
+
+void hsw_ips_post_update(struct intel_atomic_state *state,
+			 struct intel_crtc *crtc)
+{
+	const struct intel_crtc_state *new_crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+
+	if (!hsw_ips_need_enable(state, crtc))
+		return;
+
+	hsw_ips_enable(new_crtc_state);
+}
+
+/* IPS only exists on ULT machines and is tied to pipe A. */
+bool hsw_crtc_supports_ips(struct intel_crtc *crtc)
+{
+	return HAS_IPS(to_i915(crtc->base.dev)) && crtc->pipe == PIPE_A;
+}
+
+bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+
+	/* IPS only exists on ULT machines and is tied to pipe A. */
+	if (!hsw_crtc_supports_ips(crtc))
+		return false;
+
+	if (!i915->params.enable_ips)
+		return false;
+
+	if (crtc_state->pipe_bpp > 24)
+		return false;
+
+	/*
+	 * We compare against max which means we must take
+	 * the increased cdclk requirement into account when
+	 * calculating the new cdclk.
+	 *
+	 * Should measure whether using a lower cdclk w/o IPS
+	 */
+	if (IS_BROADWELL(i915) &&
+	    crtc_state->pixel_rate > i915->max_cdclk_freq * 95 / 100)
+		return false;
+
+	return true;
+}
+
+int hsw_ips_compute_config(struct intel_atomic_state *state,
+			   struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+
+	crtc_state->ips_enabled = false;
+
+	if (!hsw_crtc_state_ips_capable(crtc_state))
+		return 0;
+
+	/*
+	 * When IPS gets enabled, the pipe CRC changes. Since IPS gets
+	 * enabled and disabled dynamically based on package C states,
+	 * user space can't make reliable use of the CRCs, so let's just
+	 * completely disable it.
+	 */
+	if (crtc_state->crc_enabled)
+		return 0;
+
+	/* IPS should be fine as long as at least one plane is enabled. */
+	if (!(crtc_state->active_planes & ~BIT(PLANE_CURSOR)))
+		return 0;
+
+	if (IS_BROADWELL(i915)) {
+		const struct intel_cdclk_state *cdclk_state;
+
+		cdclk_state = intel_atomic_get_cdclk_state(state);
+		if (IS_ERR(cdclk_state))
+			return PTR_ERR(cdclk_state);
+
+		/* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
+		if (crtc_state->pixel_rate > cdclk_state->logical.cdclk * 95 / 100)
+			return 0;
+	}
+
+	crtc_state->ips_enabled = true;
+
+	return 0;
+}

drivers/gpu/drm/i915/display/hsw_ips.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef __HSW_IPS_H__
+#define __HSW_IPS_H__
+
+#include <linux/types.h>
+
+struct intel_atomic_state;
+struct intel_crtc;
+struct intel_crtc_state;
+
+bool hsw_ips_disable(const struct intel_crtc_state *crtc_state);
+bool hsw_ips_pre_update(struct intel_atomic_state *state,
+			struct intel_crtc *crtc);
+void hsw_ips_post_update(struct intel_atomic_state *state,
+			 struct intel_crtc *crtc);
+bool hsw_crtc_supports_ips(struct intel_crtc *crtc);
+bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state);
+int hsw_ips_compute_config(struct intel_atomic_state *state,
+			   struct intel_crtc *crtc);
+
+#endif /* __HSW_IPS_H__ */

drivers/gpu/drm/i915/display/intel_cdclk.c

@@ -23,6 +23,7 @@
 
 #include <linux/time.h>
 
+#include "hsw_ips.h"
 #include "intel_atomic.h"
 #include "intel_atomic_plane.h"
 #include "intel_audio.h"

drivers/gpu/drm/i915/display/intel_display.c

@@ -74,6 +74,7 @@
 
 #include "g4x_dp.h"
 #include "g4x_hdmi.h"
+#include "hsw_ips.h"
 #include "i915_drv.h"
 #include "icl_dsi.h"
 #include "intel_acpi.h"
@@ -125,7 +126,6 @@ static void bdw_set_pipemisc(const struct intel_crtc_state *crtc_state);
 static void ilk_pfit_enable(const struct intel_crtc_state *crtc_state);
 static void intel_modeset_setup_hw_state(struct drm_device *dev,
 					 struct drm_modeset_acquire_ctx *ctx);
-static bool hsw_ips_disable(const struct intel_crtc_state *crtc_state);
 
 /**
  * intel_update_watermarks - update FIFO watermark values based on current modes
@@ -1092,75 +1092,6 @@ static void ilk_pfit_enable(const struct intel_crtc_state *crtc_state)
 	intel_de_write(dev_priv, PF_WIN_SZ(pipe), width << 16 | height);
 }
 
-static void hsw_ips_enable(const struct intel_crtc_state *crtc_state)
-{
-	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
-	struct drm_device *dev = crtc->base.dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-
-	if (!crtc_state->ips_enabled)
-		return;
-
-	/*
-	 * We can only enable IPS after we enable a plane and wait for a vblank
-	 * This function is called from post_plane_update, which is run after
-	 * a vblank wait.
-	 */
-	drm_WARN_ON(dev, !(crtc_state->active_planes & ~BIT(PLANE_CURSOR)));
-
-	if (IS_BROADWELL(dev_priv)) {
-		drm_WARN_ON(dev, snb_pcode_write(dev_priv, DISPLAY_IPS_CONTROL,
-						 IPS_ENABLE | IPS_PCODE_CONTROL));
-		/* Quoting Art Runyan: "its not safe to expect any particular
-		 * value in IPS_CTL bit 31 after enabling IPS through the
-		 * mailbox." Moreover, the mailbox may return a bogus state,
-		 * so we need to just enable it and continue on.
-		 */
-	} else {
-		intel_de_write(dev_priv, IPS_CTL, IPS_ENABLE);
-		/* The bit only becomes 1 in the next vblank, so this wait here
-		 * is essentially intel_wait_for_vblank. If we don't have this
-		 * and don't wait for vblanks until the end of crtc_enable, then
-		 * the HW state readout code will complain that the expected
-		 * IPS_CTL value is not the one we read. */
-		if (intel_de_wait_for_set(dev_priv, IPS_CTL, IPS_ENABLE, 50))
-			drm_err(&dev_priv->drm,
-				"Timed out waiting for IPS enable\n");
-	}
-}
-
-static bool hsw_ips_disable(const struct intel_crtc_state *crtc_state)
-{
-	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
-	struct drm_device *dev = crtc->base.dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	bool need_vblank_wait = false;
-
-	if (!crtc_state->ips_enabled)
-		return need_vblank_wait;
-
-	if (IS_BROADWELL(dev_priv)) {
-		drm_WARN_ON(dev,
-			    snb_pcode_write(dev_priv, DISPLAY_IPS_CONTROL, 0));
-		/*
-		 * Wait for PCODE to finish disabling IPS. The BSpec specified
-		 * 42ms timeout value leads to occasional timeouts so use 100ms
-		 * instead.
-		 */
-		if (intel_de_wait_for_clear(dev_priv, IPS_CTL, IPS_ENABLE, 100))
-			drm_err(&dev_priv->drm,
-				"Timed out waiting for IPS disable\n");
-	} else {
-		intel_de_write(dev_priv, IPS_CTL, 0);
-		intel_de_posting_read(dev_priv, IPS_CTL);
-	}
-
-	/* We need to wait for a vblank before we can disable the plane. */
-	need_vblank_wait = true;
-
-	return need_vblank_wait;
-}
-
 static void intel_crtc_dpms_overlay_disable(struct intel_crtc *crtc)
 {
 	if (crtc->overlay)
@@ -1171,97 +1102,6 @@ static void intel_crtc_dpms_overlay_disable(struct intel_crtc *crtc)
 	 */
 }
 
-static bool hsw_ips_need_disable(struct intel_atomic_state *state,
-				 struct intel_crtc *crtc)
-{
-	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	const struct intel_crtc_state *old_crtc_state =
-		intel_atomic_get_old_crtc_state(state, crtc);
-	const struct intel_crtc_state *new_crtc_state =
-		intel_atomic_get_new_crtc_state(state, crtc);
-
-	if (!old_crtc_state->ips_enabled)
-		return false;
-
-	if (intel_crtc_needs_modeset(new_crtc_state))
-		return true;
-
-	/*
-	 * Workaround : Do not read or write the pipe palette/gamma data while
-	 * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
-	 *
-	 * Disable IPS before we program the LUT.
-	 */
-	if (IS_HASWELL(dev_priv) &&
-	    (new_crtc_state->uapi.color_mgmt_changed ||
-	     new_crtc_state->update_pipe) &&
-	    new_crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT)
-		return true;
-
-	return !new_crtc_state->ips_enabled;
-}
-
-static bool hsw_ips_pre_update(struct intel_atomic_state *state,
-			       struct intel_crtc *crtc)
-{
-	const struct intel_crtc_state *old_crtc_state =
-		intel_atomic_get_old_crtc_state(state, crtc);
-
-	if (!hsw_ips_need_disable(state, crtc))
-		return false;
-
-	return hsw_ips_disable(old_crtc_state);
-}
-
-static bool hsw_ips_need_enable(struct intel_atomic_state *state,
-				struct intel_crtc *crtc)
-{
-	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	const struct intel_crtc_state *old_crtc_state =
-		intel_atomic_get_old_crtc_state(state, crtc);
-	const struct intel_crtc_state *new_crtc_state =
-		intel_atomic_get_new_crtc_state(state, crtc);
-
-	if (!new_crtc_state->ips_enabled)
-		return false;
-
-	if (intel_crtc_needs_modeset(new_crtc_state))
-		return true;
-
-	/*
-	 * Workaround : Do not read or write the pipe palette/gamma data while
-	 * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
-	 *
-	 * Re-enable IPS after the LUT has been programmed.
-	 */
-	if (IS_HASWELL(dev_priv) &&
-	    (new_crtc_state->uapi.color_mgmt_changed ||
-	     new_crtc_state->update_pipe) &&
-	    new_crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT)
-		return true;
-
-	/*
-	 * We can't read out IPS on broadwell, assume the worst and
-	 * forcibly enable IPS on the first fastset.
-	 */
-	if (new_crtc_state->update_pipe && old_crtc_state->inherited)
-		return true;
-
-	return !old_crtc_state->ips_enabled;
-}
-
-static void hsw_ips_post_update(struct intel_atomic_state *state,
-				struct intel_crtc *crtc)
-{
-	const struct intel_crtc_state *new_crtc_state =
-		intel_atomic_get_new_crtc_state(state, crtc);
-
-	if (!hsw_ips_need_enable(state, crtc))
-		return;
-
-	hsw_ips_enable(new_crtc_state);
-}
-
 static bool needs_nv12_wa(const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
@@ -1938,12 +1778,6 @@ static void ilk_crtc_enable(struct intel_atomic_state *state,
 	intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, true);
 }
 
-/* IPS only exists on ULT machines and is tied to pipe A. */
-static bool hsw_crtc_supports_ips(struct intel_crtc *crtc)
-{
-	return HAS_IPS(to_i915(crtc->base.dev)) && crtc->pipe == PIPE_A;
-}
-
 static void glk_pipe_scaler_clock_gating_wa(struct drm_i915_private *dev_priv,
 					    enum pipe pipe, bool apply)
 {
@@ -2811,77 +2645,6 @@ static void intel_connector_verify_state(struct intel_crtc_state *crtc_state,
 	}
 }
 
-bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state)
-{
-	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
-	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-
-	/* IPS only exists on ULT machines and is tied to pipe A. */
-	if (!hsw_crtc_supports_ips(crtc))
-		return false;
-
-	if (!dev_priv->params.enable_ips)
-		return false;
-
-	if (crtc_state->pipe_bpp > 24)
-		return false;
-
-	/*
-	 * We compare against max which means we must take
-	 * the increased cdclk requirement into account when
-	 * calculating the new cdclk.
-	 *
-	 * Should measure whether using a lower cdclk w/o IPS
-	 */
-	if (IS_BROADWELL(dev_priv) &&
-	    crtc_state->pixel_rate > dev_priv->max_cdclk_freq * 95 / 100)
-		return false;
-
-	return true;
-}
-
-static int hsw_ips_compute_config(struct intel_atomic_state *state,
-				  struct intel_crtc *crtc)
-{
-	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
-	struct intel_crtc_state *crtc_state =
-		intel_atomic_get_new_crtc_state(state, crtc);
-
-	crtc_state->ips_enabled = false;
-
-	if (!hsw_crtc_state_ips_capable(crtc_state))
-		return 0;
-
-	/*
-	 * When IPS gets enabled, the pipe CRC changes. Since IPS gets
-	 * enabled and disabled dynamically based on package C states,
-	 * user space can't make reliable use of the CRCs, so let's just
-	 * completely disable it.
-	 */
-	if (crtc_state->crc_enabled)
-		return 0;
-
-	/* IPS should be fine as long as at least one plane is enabled. */
-	if (!(crtc_state->active_planes & ~BIT(PLANE_CURSOR)))
-		return 0;
-
-	if (IS_BROADWELL(dev_priv)) {
-		const struct intel_cdclk_state *cdclk_state;
-
-		cdclk_state = intel_atomic_get_cdclk_state(state);
-		if (IS_ERR(cdclk_state))
-			return PTR_ERR(cdclk_state);
-
-		/* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
-		if (crtc_state->pixel_rate > cdclk_state->logical.cdclk * 95 / 100)
-			return 0;
-	}
-
-	crtc_state->ips_enabled = true;
-
-	return 0;
-}
-
 static bool intel_crtc_supports_double_wide(const struct intel_crtc *crtc)
 {
 	const struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

drivers/gpu/drm/i915/display/intel_display.h

@@ -632,7 +632,6 @@ void intel_cpu_transcoder_get_m2_n2(struct intel_crtc *crtc,
 void i9xx_crtc_clock_get(struct intel_crtc *crtc,
 			 struct intel_crtc_state *pipe_config);
 int intel_dotclock_calculate(int link_freq, const struct intel_link_m_n *m_n);
-bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state);
 enum intel_display_power_domain intel_port_to_power_domain(enum port port);
 enum intel_display_power_domain
 intel_aux_power_domain(struct intel_digital_port *dig_port);