uvesafb: Clean up MTRR code

The old code allowed very strange memory types.  Now it works like
all the other video drivers: ioremap_wc is used unconditionally,
and MTRRs are set if PAT is unavailable (unless MTRR is disabled
by a module parameter).

UC, WB, and WT support is gone.  If there are MTRR conflicts that prevent
addition of a WC MTRR, adding a non-conflicting MTRR is pointless; it's
better to just turn off MTRR support entirely.

As an added bonus, any MTRR added is freed on unload.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

This commit is contained in:

Andy Lutomirski

2013-05-13 23:58:46 +00:00

committed by

Dave Airlie

parent 07ebea251d

commit 63e28a7a5f

3 changed files with 22 additions and 63 deletions

									
										include/video/uvesafb.h
									
		+1
		
												View File
												
				@@ -134,6 +134,7 @@ struct uvesafb_par {

					int mode_idx;

					struct vbe_crtc_ib crtc;

					int mtrr_handle;

				};

				#endif /* _UVESAFB_H */