drm/i915: split i915_driver_modeset_probe() to pre/post irq install

Pair the irq install and uninstall in the same layer. There are no
functional changes in the happy day scenario. The cleanup paths are
currently a mess though.

Note that modeset probe pre-irq + post-irq install are matched by
modeset driver remove pre-irq + post-irq uninstall, together, but not
independently. They are not symmetric pairs.

v2: don't add a new probe failure point here

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200219133756.13224-1-jani.nikula@intel.com

drivers/gpu/drm/i915/i915_drv.c

@@ -212,7 +212,8 @@ intel_teardown_mchbar(struct drm_i915_private *dev_priv)
 		release_resource(&dev_priv->mch_res);
 }
 
-static int i915_driver_modeset_probe(struct drm_i915_private *i915)
+/* part #1: call before irq install */
+static int i915_driver_modeset_probe_noirq(struct drm_i915_private *i915)
 {
 	int ret;
 
@@ -236,15 +237,22 @@ static int i915_driver_modeset_probe(struct drm_i915_private *i915)
 
 	intel_csr_ucode_init(i915);
 
-	ret = intel_irq_install(i915);
-	if (ret)
-		goto cleanup_csr;
+	return 0;
+
+out:
+	return ret;
+}
+
+/* part #2: call after irq install */
+static int i915_driver_modeset_probe(struct drm_i915_private *i915)
+{
+	int ret;
 
 	/* Important: The output setup functions called by modeset_init need
 	 * working irqs for e.g. gmbus and dp aux transfers. */
 	ret = intel_modeset_init(i915);
 	if (ret)
-		goto cleanup_irq;
+		goto out;
 
 	ret = i915_gem_init(i915);
 	if (ret)
@@ -271,16 +279,10 @@ static int i915_driver_modeset_probe(struct drm_i915_private *i915)
 	i915_gem_driver_remove(i915);
 	i915_gem_driver_release(i915);
 cleanup_modeset:
+	/* FIXME */
 	intel_modeset_driver_remove(i915);
 	intel_irq_uninstall(i915);
 	intel_modeset_driver_remove_noirq(i915);
-	goto cleanup_csr;
-cleanup_irq:
-	intel_irq_uninstall(i915);
-cleanup_csr:
-	intel_csr_ucode_fini(i915);
-	intel_power_domains_driver_remove(i915);
-	intel_vga_unregister(i915);
 out:
 	return ret;
 }
@@ -1459,10 +1461,18 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ret < 0)
 		goto out_cleanup_mmio;
 
-	ret = i915_driver_modeset_probe(i915);
+	ret = i915_driver_modeset_probe_noirq(i915);
 	if (ret < 0)
 		goto out_cleanup_hw;
 
+	ret = intel_irq_install(i915);
+	if (ret)
+		goto out_cleanup_modeset;
+
+	ret = i915_driver_modeset_probe(i915);
+	if (ret < 0)
+		goto out_cleanup_irq;
+
 	i915_driver_register(i915);
 
 	enable_rpm_wakeref_asserts(&i915->runtime_pm);
@@ -1471,6 +1481,10 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	return 0;
 
+out_cleanup_irq:
+	intel_irq_uninstall(i915);
+out_cleanup_modeset:
+	/* FIXME */
 out_cleanup_hw:
 	i915_driver_hw_remove(i915);
 	intel_memory_regions_driver_release(i915);