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drm/nouveau/bios: specify correct display fuse register for Ampere and Ada

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The NV_FUSE_STATUS_OPT_DISPLAY register is used to determine whether
the GPU has display hardware.  The current code that normally reads
this register is instead hard-coded to check for GA100 vs later GPUs.
Since this function is called only on pre-Hopper GPUs, and this
if-statement applies only to GA100 and later, the check works
because GA100 is the only non-display Ampere and Ada GPU.

However, there actually is a register that can be read, so we should
use it.

Fixes: a34632482f ("drm/nouveau/bios/ga10[024]: initial support")
Signed-off-by: Timur Tabi <ttabi@nvidia.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patch.msgid.link/20260430223838.2530778-8-ttabi@nvidia.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Timur Tabi 2026-04-30 17:38:35 -05:00 committed by Danilo Krummrich
parent 16d4747cd1
commit c1cf2d5db8
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowramin.c
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@ -65,13 +65,14 @@ pramin_init(struct nvkm_bios *bios, const char *name)
/* we can't get the bios image pointer without PDISP */
if (device->card_type >= GA100)
addr = device->chipset == 0x170; /*XXX: find the fuse reg for this */
addr = nvkm_rd32(device, 0x820c04);
else
if (device->card_type >= GM100)
addr = nvkm_rd32(device, 0x021c04);
else
if (device->card_type >= NV_C0)
addr = nvkm_rd32(device, 0x022500);
if (addr & 0x00000001) {
nvkm_debug(subdev, "... display disabled\n");
return ERR_PTR(-ENODEV);