drivers/video/fbdev/atyfb: Clarify ioremap() base and length used

Adjust the ioremap() call for the framebuffer to use the same
values we later use for the framebuffer. This will make it
easier to review the next change.

The size of the framebuffer varies but since this is for PCI we
*know* this defaults to 0x800000. atyfb_setup_generic() is
*only* used on PCI probe.

No functional change.

Signed-off-by: Luis R. Rodriguez <[e-mail]>
Signed-off-by: Borislav Petkov <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Cc: Andrzej Hajda <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Antonino Daplas <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: Dave Airlie <[e-mail]>
Cc: Davidlohr Bueso <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Cc: Jean-Christophe Plagniol-Villard <[e-mail]>
Cc: Juergen Gross <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Mathias Krause <[e-mail]>
Cc: Mel Gorman <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Rob Clark <[e-mail]>
Cc: Suresh Siddha <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Tomi Valkeinen <[e-mail]>
Cc: Toshi Kani <[e-mail]>
Cc: Ville Syrjälä <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

drivers/video/fbdev/aty/atyfb_base.c

···
 
 	/* Map in frame buffer */
 	info->fix.smem_start = addr;
-	info->screen_base = ioremap(addr, 0x800000);
+
+	/*
+	 * The framebuffer is not always 8 MiB, that's just the size of the
+	 * PCI BAR. We temporarily abuse smem_len here to store the size
+	 * of the BAR. aty_init() will later correct it to match the actual
+	 * framebuffer size.
+	 *
+	 * On devices that don't have the auxiliary register aperture, the
+	 * registers are housed at the top end of the framebuffer PCI BAR.
+	 * aty_fudge_framebuffer_len() is used to reduce smem_len to not
+	 * overlap with the registers.
+	 */
+	info->fix.smem_len = 0x800000;
+
+	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 	if (info->screen_base == NULL) {
 		ret = -ENOMEM;
 		goto atyfb_setup_generic_fail;