Commit 2db8d99f authored Apr 07, 2006 by Bjorn Helgaas Committed by Tony Luck Apr 07, 2006

[IA64] always map VGA framebuffer UC, even if it supports WB



EFI on some machines, e.g., Intel Tiger, reports that the VGA framebuffer
supports WB access.  ioremap() prefers WB when possible, so it can work
when mapping main memory.

But it doesn't make sense to map a framebuffer WB, because the driver
doesn't flush explicitly, so updates won't make it to the device
immediately.

This is due to Zou Nan hai <nanhai.zou@intel.com>.

More extensive fix that adds a "size" argument coming soon.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

parent cfab9d0e

include/asm-ia64/vga.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -17,7 +17,7 @@
		extern unsigned long vga_console_iobase;
		extern unsigned long vga_console_membase;

		#define VGA_MAP_MEM(x) ((unsigned long) ioremap(vga_console_membase + (x), 0))
		#define VGA_MAP_MEM(x) ((unsigned long) ioremap_nocache(vga_console_membase + (x), 0))

		#define vga_readb(x) (*(x))
		#define vga_writeb(x,y) (*(y) = (x))

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