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drm/mgag200: Rewrite cursor handling

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The cursor handling in mgag200 is complicated to understand. It touches a
number of different BOs, but doesn't really use all of them.

Rewriting the cursor update reduces the amount of cursor state. There are
two BOs for double-buffered HW updates. The source BO updates the one that
is currently not displayed and then switches buffers. Explicit BO locking
has been removed from the code. BOs are simply pinned and unpinned in video
RAM.

v2:
	* pin cursor BOs to current location

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190613073041.29350-8-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2019-06-13 09:30:39 +02:00
parent f4ce5af71b
commit 94dc57b103
3 changed files with 71 additions and 105 deletions
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4
drivers/gpu/drm/mgag200/mgag200_main.c
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@@ -241,10 +241,8 @@ int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
mdev->cursor.pixels_2 = NULL;
dev_warn(&dev->pdev->dev,
"Could not allocate space for cursors. Not doing hardware cursors.\n");
} else {
mdev->cursor.pixels_current = mdev->cursor.pixels_1;
mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
}
mdev->cursor.pixels_current = NULL;
return 0;