fbdev: atyfb: only use ioremap_uc() on i386 and ia64

ioremap_uc() is only meaningful on old x86-32 systems with the PAT
extension, and on ia64 with its slightly unconventional ioremap()
behavior, everywhere else this is the same as ioremap() anyway.

Change the only driver that still references ioremap_uc() to only do so
on x86-32/ia64 in order to allow removing that interface at some
point in the future for the other architectures.

On some architectures, ioremap_uc() just returns NULL, changing
the driver to call ioremap() means that they now have a chance
of working correctly.

Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Baoquan He <[email protected]>
Reviewed-by: Luis Chamberlain <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Helge Deller <[email protected]>

Author: arndb

drivers/video/fbdev/aty/atyfb_base.c

@@ -3440,11 +3440,15 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
 	}
 
 	info->fix.mmio_start = raddr;
+#if defined(__i386__) || defined(__ia64__)
 	/*
 	 * By using strong UC we force the MTRR to never have an
 	 * effect on the MMIO region on both non-PAT and PAT systems.
 	 */
 	par->ati_regbase = ioremap_uc(info->fix.mmio_start, 0x1000);
+#else
+	par->ati_regbase = ioremap(info->fix.mmio_start, 0x1000);
+#endif
 	if (par->ati_regbase == NULL)
 		return -ENOMEM;