drm/i915: Initialize dkl_phy spin lock from display code path

drm/i915: Initialize dkl_phy spin lock from display code path

Start moving the initialization of display locks from
i915_driver_early_probe().
Display locks should be initialized from display-only code paths.

It was also agreed that if a variable is only used in one file, it
should be initialized only in that file, so intel_dkl_phy_init() was
added.

v2:
- added intel_display_locks_init()

v3:
- rebased

v4:
- dropped intel_display_locks_init()

v5:
- moved intel_dkl_phy_init() to the beginning of file

Cc: intel-gfx@lists.freedesktop.org
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230420170558.35398-1-jose.souza@intel.com

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

@@ -30,6 +30,7 @@
 #include "intel_display_driver.h"
 #include "intel_display_power.h"
 #include "intel_display_types.h"
+#include "intel_dkl_phy.h"
 #include "intel_dmc.h"
 #include "intel_dp.h"
 #include "intel_dpll.h"
@@ -175,6 +176,7 @@ void intel_display_driver_early_probe(struct drm_i915_private *i915)
 	if (!HAS_DISPLAY(i915))
 		return;
 
+	intel_dkl_phy_init(i915);
 	intel_color_init_hooks(i915);
 	intel_init_cdclk_hooks(i915);
 	intel_audio_hooks_init(i915);

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

@@ -11,6 +11,15 @@
 #include "intel_dkl_phy.h"
 #include "intel_dkl_phy_regs.h"
 
+/**
+ * intel_dkl_phy_init - initialize Dekel PHY
+ * @i915: i915 device instance
+ */
+void intel_dkl_phy_init(struct drm_i915_private *i915)
+{
+	spin_lock_init(&i915->display.dkl.phy_lock);
+}
+
 static void
 dkl_phy_set_hip_idx(struct drm_i915_private *i915, struct intel_dkl_phy_reg reg)
 {

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

@@ -12,6 +12,7 @@
 
 struct drm_i915_private;
 
+void intel_dkl_phy_init(struct drm_i915_private *i915);
 u32
 intel_dkl_phy_read(struct drm_i915_private *i915, struct intel_dkl_phy_reg reg);
 void

drivers/gpu/drm/i915/i915_driver.c

@@ -223,7 +223,6 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv)
 	mutex_init(&dev_priv->display.wm.wm_mutex);
 	mutex_init(&dev_priv->display.pps.mutex);
 	mutex_init(&dev_priv->display.hdcp.comp_mutex);
-	spin_lock_init(&dev_priv->display.dkl.phy_lock);
 
 	i915_memcpy_init_early(dev_priv);
 	intel_runtime_pm_init_early(&dev_priv->runtime_pm);