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UPSTREAM: nb/gm45: Refactor IGD vram decoding

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This is more consistent with other Intel GMCH code.

BUG=None
BRANCH=None
TEST=None

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/17405
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>

Change-Id: I7bfaa79b9031e2dcc5879a607cadacbdd22ebde7
Reviewed-on: https://chromium-review.googlesource.com/411294
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Arthur Heymans 2016-11-12 20:13:07 +01:00 • committed by chrome-bot
parent adb320328e
commit 76e71c3e28
1 changed files with 11 additions and 31 deletions
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42
src/northbridge/intel/gm45/ram_calc.c
View file

@ -25,40 +25,20 @@
#include <cbmem.h>
#include "gm45.h"
/** Decodes used Graphics Mode Select (GMS) to kilobytes. */
/*
* Decodes used Graphics Mode Select (GMS) to kilobytes.
* The options for 1M, 4M, 8M and 16M preallocated igd memory are
* undocumented but are verified to work.
*/
u32 decode_igd_memory_size(const u32 gms)
{
switch (gms) {
case 1:
return 1 << 10;
case 2:
return 4 << 10; /* guessed */
case 3:
return 8 << 10; /* guessed */
case 4:
return 16 << 10;
case 5:
return 32 << 10;
case 6:
return 48 << 10;
case 7:
return 64 << 10;
case 8:
return 128 << 10;
case 9:
return 256 << 10;
case 10:
return 96 << 10;
case 11:
return 160 << 10;
case 12:
return 224 << 10;
case 13:
return 352 << 10;
default:
static const u16 ggc2uma[] = { 0, 1, 4, 8, 16, 32, 48, 64, 128, 256,
96, 160, 224, 352 };
if (gms > ARRAY_SIZE(ggc2uma))
die("Bad Graphics Mode Select (GMS) setting.\n");
return 0;
}
return ggc2uma[gms] << 10;
}
/** Decodes used Graphics Stolen Memory (GSM) to kilobytes. */