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drm/nouveau/bios: cache ramcfg strap on later chipsets 

This fixes suspend/resume on at least Quadro 400.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2012-12-20 07:48:51 +10:00
parent 3d8ec27739
commit 5ddf4d4a54
2 changed files with 18 additions and 1 deletions
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1
drivers/gpu/drm/nouveau/core/include/subdev/bios/init.h
View File

@ -13,6 +13,7 @@ struct nvbios_init {
u32 nested;
u16 repeat;
u16 repend;
u32 ramcfg;
};
int nvbios_exec(struct nvbios_init *);

18
drivers/gpu/drm/nouveau/core/subdev/bios/init.c
View File

@ -410,10 +410,26 @@ init_ram_restrict_group_count(struct nvbios_init *init)
return 0x00;
}
static u8
init_ram_restrict_strap(struct nvbios_init *init)
{
/* This appears to be the behaviour of the VBIOS parser, and *is*
* important to cache the NV_PEXTDEV_BOOT0 on later chipsets to
* avoid fucking up the memory controller (somehow) by reading it
* on every INIT_RAM_RESTRICT_ZM_GROUP opcode.
*
* Preserving the non-caching behaviour on earlier chipsets just
* in case *not* re-reading the strap causes similar breakage.
*/
if (!init->ramcfg || init->bios->version.major < 0x70)
init->ramcfg = init_rd32(init, 0x101000);
return (init->ramcfg & 0x00000003c) >> 2;
}
static u8
init_ram_restrict(struct nvbios_init *init)
{
u32 strap = (init_rd32(init, 0x101000) & 0x0000003c) >> 2;
u8 strap = init_ram_restrict_strap(init);
u16 table = init_ram_restrict_table(init);
if (table)
return nv_ro08(init->bios, table + strap);