[RESEND PATCH v3] drm/mxsfb: Remove generic DRM drivers in probe function

[Dario Binacchi <dario.binacchi@amarulasolutions.com>]

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

Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

---

Changes in v3:
- Add 'Reviewed-by' of  Thomas Zimmermann

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 59020862cf65..e5eb644b54ae 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>
@@ -361,6 +362,15 @@ 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