drm/i915/display: Extract display init from intel_device_info_runtime_init

Moving display-specific runtime info initialization into display/ makes
the display code more self-contained and also makes it easier to call
from the Xe driver.

v2:
 - Drop unnecessary display/ prefix from #includes.  (Jani)
 - Clear runtime info if fusing leaves no pipes remaining, the same as
   we do when fusing indicates the entire display controller is
   unavailable.  (Jani)
 - Move adjustment of DRIVER_MODESET / DRIVER_ATOMIC after call to
   intel_display_device_info_runtime_init(); HAS_DISPLAY may have
   changed to false during the runtime init.  (Jani)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230602181450.1151368-1-matthew.d.roper@intel.com

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

@@ -9,6 +9,8 @@
 
 #include "i915_drv.h"
 #include "i915_reg.h"
+#include "intel_de.h"
+#include "intel_display.h"
 #include "intel_display_device.h"
 #include "intel_display_power.h"
 #include "intel_display_reg_defs.h"
@@ -788,3 +790,128 @@ intel_display_device_probe(struct drm_i915_private *i915, bool has_gmdid,
 
 	return &no_display;
 }
+
+void intel_display_device_info_runtime_init(struct drm_i915_private *i915)
+{
+	struct intel_display_runtime_info *display_runtime = DISPLAY_RUNTIME_INFO(i915);
+	enum pipe pipe;
+
+	/* Wa_14011765242: adl-s A0,A1 */
+	if (IS_ADLS_DISPLAY_STEP(i915, STEP_A0, STEP_A2))
+		for_each_pipe(i915, pipe)
+			display_runtime->num_scalers[pipe] = 0;
+	else if (DISPLAY_VER(i915) >= 11) {
+		for_each_pipe(i915, pipe)
+			display_runtime->num_scalers[pipe] = 2;
+	} else if (DISPLAY_VER(i915) >= 9) {
+		display_runtime->num_scalers[PIPE_A] = 2;
+		display_runtime->num_scalers[PIPE_B] = 2;
+		display_runtime->num_scalers[PIPE_C] = 1;
+	}
+
+	if (DISPLAY_VER(i915) >= 13 || HAS_D12_PLANE_MINIMIZATION(i915))
+		for_each_pipe(i915, pipe)
+			display_runtime->num_sprites[pipe] = 4;
+	else if (DISPLAY_VER(i915) >= 11)
+		for_each_pipe(i915, pipe)
+			display_runtime->num_sprites[pipe] = 6;
+	else if (DISPLAY_VER(i915) == 10)
+		for_each_pipe(i915, pipe)
+			display_runtime->num_sprites[pipe] = 3;
+	else if (IS_BROXTON(i915)) {
+		/*
+		 * Skylake and Broxton currently don't expose the topmost plane as its
+		 * use is exclusive with the legacy cursor and we only want to expose
+		 * one of those, not both. Until we can safely expose the topmost plane
+		 * as a DRM_PLANE_TYPE_CURSOR with all the features exposed/supported,
+		 * we don't expose the topmost plane at all to prevent ABI breakage
+		 * down the line.
+		 */
+
+		display_runtime->num_sprites[PIPE_A] = 2;
+		display_runtime->num_sprites[PIPE_B] = 2;
+		display_runtime->num_sprites[PIPE_C] = 1;
+	} else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
+		for_each_pipe(i915, pipe)
+			display_runtime->num_sprites[pipe] = 2;
+	} else if (DISPLAY_VER(i915) >= 5 || IS_G4X(i915)) {
+		for_each_pipe(i915, pipe)
+			display_runtime->num_sprites[pipe] = 1;
+	}
+
+	if ((IS_DGFX(i915) || DISPLAY_VER(i915) >= 14) &&
+	    !(intel_de_read(i915, GU_CNTL_PROTECTED) & DEPRESENT)) {
+		drm_info(&i915->drm, "Display not present, disabling\n");
+		goto display_fused_off;
+	}
+
+	if (IS_GRAPHICS_VER(i915, 7, 8) && HAS_PCH_SPLIT(i915)) {
+		u32 fuse_strap = intel_de_read(i915, FUSE_STRAP);
+		u32 sfuse_strap = intel_de_read(i915, SFUSE_STRAP);
+
+		/*
+		 * SFUSE_STRAP is supposed to have a bit signalling the display
+		 * is fused off. Unfortunately it seems that, at least in
+		 * certain cases, fused off display means that PCH display
+		 * reads don't land anywhere. In that case, we read 0s.
+		 *
+		 * On CPT/PPT, we can detect this case as SFUSE_STRAP_FUSE_LOCK
+		 * should be set when taking over after the firmware.
+		 */
+		if (fuse_strap & ILK_INTERNAL_DISPLAY_DISABLE ||
+		    sfuse_strap & SFUSE_STRAP_DISPLAY_DISABLED ||
+		    (HAS_PCH_CPT(i915) &&
+		     !(sfuse_strap & SFUSE_STRAP_FUSE_LOCK))) {
+			drm_info(&i915->drm,
+				 "Display fused off, disabling\n");
+			goto display_fused_off;
+		} else if (fuse_strap & IVB_PIPE_C_DISABLE) {
+			drm_info(&i915->drm, "PipeC fused off\n");
+			display_runtime->pipe_mask &= ~BIT(PIPE_C);
+			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_C);
+		}
+	} else if (DISPLAY_VER(i915) >= 9) {
+		u32 dfsm = intel_de_read(i915, SKL_DFSM);
+
+		if (dfsm & SKL_DFSM_PIPE_A_DISABLE) {
+			display_runtime->pipe_mask &= ~BIT(PIPE_A);
+			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_A);
+			display_runtime->fbc_mask &= ~BIT(INTEL_FBC_A);
+		}
+		if (dfsm & SKL_DFSM_PIPE_B_DISABLE) {
+			display_runtime->pipe_mask &= ~BIT(PIPE_B);
+			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_B);
+		}
+		if (dfsm & SKL_DFSM_PIPE_C_DISABLE) {
+			display_runtime->pipe_mask &= ~BIT(PIPE_C);
+			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_C);
+		}
+
+		if (DISPLAY_VER(i915) >= 12 &&
+		    (dfsm & TGL_DFSM_PIPE_D_DISABLE)) {
+			display_runtime->pipe_mask &= ~BIT(PIPE_D);
+			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_D);
+		}
+
+		if (!display_runtime->pipe_mask)
+			goto display_fused_off;
+
+		if (dfsm & SKL_DFSM_DISPLAY_HDCP_DISABLE)
+			display_runtime->has_hdcp = 0;
+
+		if (dfsm & SKL_DFSM_DISPLAY_PM_DISABLE)
+			display_runtime->fbc_mask = 0;
+
+		if (DISPLAY_VER(i915) >= 11 && (dfsm & ICL_DFSM_DMC_DISABLE))
+			display_runtime->has_dmc = 0;
+
+		if (IS_DISPLAY_VER(i915, 10, 12) &&
+		    (dfsm & GLK_DFSM_DISPLAY_DSC_DISABLE))
+			display_runtime->has_dsc = 0;
+	}
+
+	return;
+
+display_fused_off:
+	memset(display_runtime, 0, sizeof(*display_runtime));
+}

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

@@ -124,5 +124,6 @@ struct intel_display_device_info {
 const struct intel_display_device_info *
 intel_display_device_probe(struct drm_i915_private *i915, bool has_gmdid,
 			   u16 *ver, u16 *rel, u16 *step);
+void intel_display_device_info_runtime_init(struct drm_i915_private *i915);
 
 #endif

drivers/gpu/drm/i915/intel_device_info.c

@@ -27,9 +27,7 @@
 #include <drm/drm_print.h>
 #include <drm/i915_pciids.h>
 
-#include "display/intel_cdclk.h"
-#include "display/intel_de.h"
-#include "display/intel_display.h"
+#include "display/intel_display_device.h"
 #include "gt/intel_gt_regs.h"
 #include "i915_drv.h"
 #include "i915_reg.h"
@@ -411,125 +409,23 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
 {
 	struct intel_device_info *info = mkwrite_device_info(dev_priv);
 	struct intel_runtime_info *runtime = RUNTIME_INFO(dev_priv);
-	struct intel_display_runtime_info *display_runtime =
-		DISPLAY_RUNTIME_INFO(dev_priv);
-	enum pipe pipe;
-
-	/* Wa_14011765242: adl-s A0,A1 */
-	if (IS_ADLS_DISPLAY_STEP(dev_priv, STEP_A0, STEP_A2))
-		for_each_pipe(dev_priv, pipe)
-			display_runtime->num_scalers[pipe] = 0;
-	else if (DISPLAY_VER(dev_priv) >= 11) {
-		for_each_pipe(dev_priv, pipe)
-			display_runtime->num_scalers[pipe] = 2;
-	} else if (DISPLAY_VER(dev_priv) >= 9) {
-		display_runtime->num_scalers[PIPE_A] = 2;
-		display_runtime->num_scalers[PIPE_B] = 2;
-		display_runtime->num_scalers[PIPE_C] = 1;
-	}
-
-	BUILD_BUG_ON(BITS_PER_TYPE(intel_engine_mask_t) < I915_NUM_ENGINES);
 
-	if (DISPLAY_VER(dev_priv) >= 13 || HAS_D12_PLANE_MINIMIZATION(dev_priv))
-		for_each_pipe(dev_priv, pipe)
-			display_runtime->num_sprites[pipe] = 4;
-	else if (DISPLAY_VER(dev_priv) >= 11)
-		for_each_pipe(dev_priv, pipe)
-			display_runtime->num_sprites[pipe] = 6;
-	else if (DISPLAY_VER(dev_priv) == 10)
-		for_each_pipe(dev_priv, pipe)
-			display_runtime->num_sprites[pipe] = 3;
-	else if (IS_BROXTON(dev_priv)) {
-		/*
-		 * Skylake and Broxton currently don't expose the topmost plane as its
-		 * use is exclusive with the legacy cursor and we only want to expose
-		 * one of those, not both. Until we can safely expose the topmost plane
-		 * as a DRM_PLANE_TYPE_CURSOR with all the features exposed/supported,
-		 * we don't expose the topmost plane at all to prevent ABI breakage
-		 * down the line.
-		 */
+	if (HAS_DISPLAY(dev_priv))
+		intel_display_device_info_runtime_init(dev_priv);
 
-		display_runtime->num_sprites[PIPE_A] = 2;
-		display_runtime->num_sprites[PIPE_B] = 2;
-		display_runtime->num_sprites[PIPE_C] = 1;
-	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
-		for_each_pipe(dev_priv, pipe)
-			display_runtime->num_sprites[pipe] = 2;
-	} else if (DISPLAY_VER(dev_priv) >= 5 || IS_G4X(dev_priv)) {
-		for_each_pipe(dev_priv, pipe)
-			display_runtime->num_sprites[pipe] = 1;
-	}
-
-	if (HAS_DISPLAY(dev_priv) &&
-	    (IS_DGFX(dev_priv) || DISPLAY_VER(dev_priv) >= 14) &&
-	    !(intel_de_read(dev_priv, GU_CNTL_PROTECTED) & DEPRESENT)) {
-		drm_info(&dev_priv->drm, "Display not present, disabling\n");
-
-		display_runtime->pipe_mask = 0;
+	/* Display may have been disabled by runtime init */
+	if (!HAS_DISPLAY(dev_priv)) {
+		dev_priv->drm.driver_features &= ~(DRIVER_MODESET |
+						   DRIVER_ATOMIC);
+		info->display = &no_display;
 	}
 
-	if (HAS_DISPLAY(dev_priv) && IS_GRAPHICS_VER(dev_priv, 7, 8) &&
-	    HAS_PCH_SPLIT(dev_priv)) {
-		u32 fuse_strap = intel_de_read(dev_priv, FUSE_STRAP);
-		u32 sfuse_strap = intel_de_read(dev_priv, SFUSE_STRAP);
-
-		/*
-		 * SFUSE_STRAP is supposed to have a bit signalling the display
-		 * is fused off. Unfortunately it seems that, at least in
-		 * certain cases, fused off display means that PCH display
-		 * reads don't land anywhere. In that case, we read 0s.
-		 *
-		 * On CPT/PPT, we can detect this case as SFUSE_STRAP_FUSE_LOCK
-		 * should be set when taking over after the firmware.
-		 */
-		if (fuse_strap & ILK_INTERNAL_DISPLAY_DISABLE ||
-		    sfuse_strap & SFUSE_STRAP_DISPLAY_DISABLED ||
-		    (HAS_PCH_CPT(dev_priv) &&
-		     !(sfuse_strap & SFUSE_STRAP_FUSE_LOCK))) {
-			drm_info(&dev_priv->drm,
-				 "Display fused off, disabling\n");
-			display_runtime->pipe_mask = 0;
-		} else if (fuse_strap & IVB_PIPE_C_DISABLE) {
-			drm_info(&dev_priv->drm, "PipeC fused off\n");
-			display_runtime->pipe_mask &= ~BIT(PIPE_C);
-			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_C);
-		}
-	} else if (HAS_DISPLAY(dev_priv) && DISPLAY_VER(dev_priv) >= 9) {
-		u32 dfsm = intel_de_read(dev_priv, SKL_DFSM);
-
-		if (dfsm & SKL_DFSM_PIPE_A_DISABLE) {
-			display_runtime->pipe_mask &= ~BIT(PIPE_A);
-			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_A);
-			display_runtime->fbc_mask &= ~BIT(INTEL_FBC_A);
-		}
-		if (dfsm & SKL_DFSM_PIPE_B_DISABLE) {
-			display_runtime->pipe_mask &= ~BIT(PIPE_B);
-			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_B);
-		}
-		if (dfsm & SKL_DFSM_PIPE_C_DISABLE) {
-			display_runtime->pipe_mask &= ~BIT(PIPE_C);
-			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_C);
-		}
-
-		if (DISPLAY_VER(dev_priv) >= 12 &&
-		    (dfsm & TGL_DFSM_PIPE_D_DISABLE)) {
-			display_runtime->pipe_mask &= ~BIT(PIPE_D);
-			display_runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_D);
-		}
-
-		if (dfsm & SKL_DFSM_DISPLAY_HDCP_DISABLE)
-			display_runtime->has_hdcp = 0;
-
-		if (dfsm & SKL_DFSM_DISPLAY_PM_DISABLE)
-			display_runtime->fbc_mask = 0;
-
-		if (DISPLAY_VER(dev_priv) >= 11 && (dfsm & ICL_DFSM_DMC_DISABLE))
-			display_runtime->has_dmc = 0;
+	/* Disable nuclear pageflip by default on pre-g4x */
+	if (!dev_priv->params.nuclear_pageflip &&
+	    DISPLAY_VER(dev_priv) < 5 && !IS_G4X(dev_priv))
+		dev_priv->drm.driver_features &= ~DRIVER_ATOMIC;
 
-		if (IS_DISPLAY_VER(dev_priv, 10, 12) &&
-		    (dfsm & GLK_DFSM_DISPLAY_DSC_DISABLE))
-			display_runtime->has_dsc = 0;
-	}
+	BUILD_BUG_ON(BITS_PER_TYPE(intel_engine_mask_t) < I915_NUM_ENGINES);
 
 	if (GRAPHICS_VER(dev_priv) == 6 && i915_vtd_active(dev_priv)) {
 		drm_info(&dev_priv->drm,
@@ -540,24 +436,6 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
 	runtime->rawclk_freq = intel_read_rawclk(dev_priv);
 	drm_dbg(&dev_priv->drm, "rawclk rate: %d kHz\n", runtime->rawclk_freq);
 
-	if (!HAS_DISPLAY(dev_priv)) {
-		dev_priv->drm.driver_features &= ~(DRIVER_MODESET |
-						   DRIVER_ATOMIC);
-		info->display = &no_display;
-
-		display_runtime->cpu_transcoder_mask = 0;
-		memset(display_runtime->num_sprites, 0, sizeof(display_runtime->num_sprites));
-		memset(display_runtime->num_scalers, 0, sizeof(display_runtime->num_scalers));
-		display_runtime->fbc_mask = 0;
-		display_runtime->has_hdcp = false;
-		display_runtime->has_dmc = false;
-		display_runtime->has_dsc = false;
-	}
-
-	/* Disable nuclear pageflip by default on pre-g4x */
-	if (!dev_priv->params.nuclear_pageflip &&
-	    DISPLAY_VER(dev_priv) < 5 && !IS_G4X(dev_priv))
-		dev_priv->drm.driver_features &= ~DRIVER_ATOMIC;
 }
 
 /*