drm/drm_agpsupport: Strip out obviously wrong descriptions and demote to standard headers

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/drm_agpsupport.c:61: warning: Function parameter or member 'dev' not described in 'drm_agp_info'
 drivers/gpu/drm/drm_agpsupport.c:61: warning: Function parameter or member 'info' not described in 'drm_agp_info'
 drivers/gpu/drm/drm_agpsupport.c:105: warning: Function parameter or member 'dev' not described in 'drm_agp_acquire'
 drivers/gpu/drm/drm_agpsupport.c:132: warning: Function parameter or member 'dev' not described in 'drm_agp_acquire_ioctl'
 drivers/gpu/drm/drm_agpsupport.c:132: warning: Function parameter or member 'data' not described in 'drm_agp_acquire_ioctl'
 drivers/gpu/drm/drm_agpsupport.c:132: warning: Function parameter or member 'file_priv' not described in 'drm_agp_acquire_ioctl'
 drivers/gpu/drm/drm_agpsupport.c:145: warning: Function parameter or member 'dev' not described in 'drm_agp_release'
 drivers/gpu/drm/drm_agpsupport.c:171: warning: Function parameter or member 'dev' not described in 'drm_agp_enable'
 drivers/gpu/drm/drm_agpsupport.c:171: warning: Function parameter or member 'mode' not described in 'drm_agp_enable'
 drivers/gpu/drm/drm_agpsupport.c:203: warning: Function parameter or member 'dev' not described in 'drm_agp_alloc'
 drivers/gpu/drm/drm_agpsupport.c:203: warning: Function parameter or member 'request' not described in 'drm_agp_alloc'
 drivers/gpu/drm/drm_agpsupport.c:256: warning: Function parameter or member 'dev' not described in 'drm_agp_lookup_entry'
 drivers/gpu/drm/drm_agpsupport.c:256: warning: Function parameter or member 'handle' not described in 'drm_agp_lookup_entry'
 drivers/gpu/drm/drm_agpsupport.c:279: warning: Function parameter or member 'dev' not described in 'drm_agp_unbind'
 drivers/gpu/drm/drm_agpsupport.c:279: warning: Function parameter or member 'request' not described in 'drm_agp_unbind'
 drivers/gpu/drm/drm_agpsupport.c:318: warning: Function parameter or member 'dev' not described in 'drm_agp_bind'
 drivers/gpu/drm/drm_agpsupport.c:318: warning: Function parameter or member 'request' not described in 'drm_agp_bind'
 drivers/gpu/drm/drm_agpsupport.c:363: warning: Function parameter or member 'dev' not described in 'drm_agp_free'
 drivers/gpu/drm/drm_agpsupport.c:363: warning: Function parameter or member 'request' not described in 'drm_agp_free'
 drivers/gpu/drm/drm_agpsupport.c:404: warning: Function parameter or member 'dev' not described in 'drm_agp_init'

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Faith <faith@valinux.com>
Cc: Gareth Hughes <gareth@valinux.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181601.3432599-24-lee.jones@linaro.org

drivers/gpu/drm/drm_agpsupport.c

@@ -45,13 +45,9 @@
 
 #include "drm_legacy.h"
 
-/**
+/*
  * Get AGP information.
  *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg pointer to a (output) drm_agp_info structure.
  * \return zero on success or a negative number on failure.
  *
  * Verifies the AGP device has been initialized and acquired and fills in the
@@ -92,7 +88,7 @@ int drm_agp_info_ioctl(struct drm_device *dev, void *data,
 	return 0;
 }
 
-/**
+/*
  * Acquire the AGP device.
  *
  * \param dev DRM device that is to acquire AGP.
@@ -115,13 +111,9 @@ int drm_agp_acquire(struct drm_device *dev)
 }
 EXPORT_SYMBOL(drm_agp_acquire);
 
-/**
+/*
  * Acquire the AGP device (ioctl).
  *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg user argument.
  * \return zero on success or a negative number on failure.
  *
  * Verifies the AGP device hasn't been acquired before and calls
@@ -133,7 +125,7 @@ int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
 	return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
 }
 
-/**
+/*
  * Release the AGP device.
  *
  * \param dev DRM device that is to release AGP.
@@ -157,7 +149,7 @@ int drm_agp_release_ioctl(struct drm_device *dev, void *data,
 	return drm_agp_release(dev);
 }
 
-/**
+/*
  * Enable the AGP bus.
  *
  * \param dev DRM device that has previously acquired AGP.
@@ -187,13 +179,9 @@ int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
 	return drm_agp_enable(dev, *mode);
 }
 
-/**
+/*
  * Allocate AGP memory.
  *
- * \param inode device inode.
- * \param file_priv file private pointer.
- * \param cmd command.
- * \param arg pointer to a drm_agp_buffer structure.
  * \return zero on success or a negative number on failure.
  *
  * Verifies the AGP device is present and has been acquired, allocates the
@@ -242,7 +230,7 @@ int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
 	return drm_agp_alloc(dev, request);
 }
 
-/**
+/*
  * Search for the AGP memory entry associated with a handle.
  *
  * \param dev DRM device structure.
@@ -263,13 +251,9 @@ static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device *dev,
 	return NULL;
 }
 
-/**
+/*
  * Unbind AGP memory from the GATT (ioctl).
  *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg pointer to a drm_agp_binding structure.
  * \return zero on success or a negative number on failure.
  *
  * Verifies the AGP device is present and acquired, looks-up the AGP memory
@@ -301,13 +285,9 @@ int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
 	return drm_agp_unbind(dev, request);
 }
 
-/**
+/*
  * Bind AGP memory into the GATT (ioctl)
  *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg pointer to a drm_agp_binding structure.
  * \return zero on success or a negative number on failure.
  *
  * Verifies the AGP device is present and has been acquired and that no memory
@@ -345,13 +325,9 @@ int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
 	return drm_agp_bind(dev, request);
 }
 
-/**
+/*
  * Free AGP memory (ioctl).
  *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg pointer to a drm_agp_buffer structure.
  * \return zero on success or a negative number on failure.
  *
  * Verifies the AGP device is present and has been acquired and looks up the
@@ -388,7 +364,7 @@ int drm_agp_free_ioctl(struct drm_device *dev, void *data,
 	return drm_agp_free(dev, request);
 }
 
-/**
+/*
  * Initialize the AGP resources.
  *
  * \return pointer to a drm_agp_head structure.