Use aperture helpers to remove all generic graphics drivers before
loading mxsfb. Makes mxsfb compatible with simpledrm.

Co-developed-by: Michael Trimarchi <mich...@amarulasolutions.com>
Signed-off-by: Michael Trimarchi <mich...@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binac...@amarulasolutions.com>

---

Changes in v2:
- Use aperture_remove_all_conflicting_devices() instead of
  drm_aperture_remove_framebuffers().

 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c 
b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 6b95e4eb3e4e..10da8b54f4c6 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -8,6 +8,7 @@
  * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
  */
 
+#include <linux/aperture.h>
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
@@ -362,6 +363,15 @@ static int mxsfb_probe(struct platform_device *pdev)
        if (ret)
                goto err_free;
 
+       /*
+        * Remove early framebuffers (ie. simplefb). The framebuffer can be
+        * located anywhere in RAM
+        */
+       ret = aperture_remove_all_conflicting_devices(mxsfb_driver.name);
+       if (ret)
+               return dev_err_probe(&pdev->dev, ret,
+                                    "can't kick out existing framebuffers\n");
+
        ret = drm_dev_register(drm, 0);
        if (ret)
                goto err_unload;
-- 
2.43.0

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