[PATCH v2 1/2] drm: move i915_kick_out_vgacon to drm_fb_helper

[Gerd Hoffmann <kraxel@redhat.com>]

It'll be useful for other drivers too, so move it to drm_fb_helper.c
(and rename it of course).  Also add docs.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/drm/drm_fb_helper.h     |  2 ++
 drivers/gpu/drm/drm_fb_helper.c | 39 +++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_drv.c | 35 +----------------------------------
 3 files changed, 42 insertions(+), 34 deletions(-)

diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index bb9acea613..a401ba47ad 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -649,4 +649,6 @@ drm_fb_helper_remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
 #endif
 }
 
+int drm_fb_helper_kick_out_vgacon(void);
+
 #endif
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 0e9349ff2d..a2d7e5bc51 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -35,6 +35,7 @@
 #include <linux/sysrq.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/vt_kern.h>
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
@@ -3353,3 +3354,41 @@ int __init drm_fb_helper_modinit(void)
 	return 0;
 }
 EXPORT_SYMBOL(drm_fb_helper_modinit);
+
+/**
+ * drm_fb_helper_kick_out_vgacon - deactivate vgacon driver.
+ *
+ * Deactivate vgacon driver so it stops accessing vga io ports.
+ * Should be called after
+ * drm_fb_helper_remove_conflicting_pci_framebuffers().
+ *
+ * Returns:
+ * Zero on success or negative error code on failure.
+ */
+int drm_fb_helper_kick_out_vgacon(void)
+{
+#if !defined(CONFIG_VGA_CONSOLE)
+        return 0;
+#elif !defined(CONFIG_DUMMY_CONSOLE)
+        return -ENODEV;
+#else
+        int ret = 0;
+
+        DRM_INFO("Replacing VGA console driver\n");
+
+        console_lock();
+        if (con_is_bound(&vga_con))
+                ret = do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES - 1, 1);
+        if (ret == 0) {
+                ret = do_unregister_con_driver(&vga_con);
+
+                /* Ignore "already unregistered". */
+                if (ret == -ENODEV)
+                        ret = 0;
+        }
+        console_unlock();
+
+        return ret;
+#endif
+}
+EXPORT_SYMBOL(drm_fb_helper_kick_out_vgacon);
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 6630212f2f..3edd4d7d55 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -757,39 +757,6 @@ static int i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
 	return ret;
 }
 
-#if !defined(CONFIG_VGA_CONSOLE)
-static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
-{
-	return 0;
-}
-#elif !defined(CONFIG_DUMMY_CONSOLE)
-static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
-{
-	return -ENODEV;
-}
-#else
-static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
-{
-	int ret = 0;
-
-	DRM_INFO("Replacing VGA console driver\n");
-
-	console_lock();
-	if (con_is_bound(&vga_con))
-		ret = do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES - 1, 1);
-	if (ret == 0) {
-		ret = do_unregister_con_driver(&vga_con);
-
-		/* Ignore "already unregistered". */
-		if (ret == -ENODEV)
-			ret = 0;
-	}
-	console_unlock();
-
-	return ret;
-}
-#endif
-
 static void intel_init_dpio(struct drm_i915_private *dev_priv)
 {
 	/*
@@ -1420,7 +1387,7 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
 		goto err_ggtt;
 	}
 
-	ret = i915_kick_out_vgacon(dev_priv);
+	ret = drm_fb_helper_kick_out_vgacon();
 	if (ret) {
 		DRM_ERROR("failed to remove conflicting VGA console\n");
 		goto err_ggtt;
-- 
2.9.3

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