Commit f0790cda authored by Ben Skeggs's avatar Ben Skeggs
Browse files

drm/nouveau/therm: skip probing for devices not specified in thermal tables 

Saves some time during driver load, as described by the relevant section[1]
of the DCB 4.x specification.

[1] https://nvidia.github.io/open-gpu-doc/DCB/DCB-4.x-Specification.html#_i2c_device_table



Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent edc641b2

drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/extdev.h

+2 −0
Original line number Diff line number Diff line
@@ -26,4 +26,6 @@ nvbios_extdev_parse(struct nvkm_bios *, int, struct nvbios_extdev_func *); 
int

nvbios_extdev_find(struct nvkm_bios *, enum nvbios_extdev_type,

		   struct nvbios_extdev_func *);



bool nvbios_extdev_skip_probe(struct nvkm_bios *);

#endif

drivers/gpu/drm/nouveau/nvkm/subdev/bios/extdev.c

+13 −0
Original line number Diff line number Diff line
@@ -46,6 +46,19 @@ extdev_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt) 
	return extdev + *hdr;

}



bool

nvbios_extdev_skip_probe(struct nvkm_bios *bios)

{

	u8  ver, hdr, len, cnt;

	u16 data = extdev_table(bios, &ver, &hdr, &len, &cnt);

	if (data && ver == 0x40 && hdr >= 5) {

		u8 flags = nvbios_rd08(bios, data - hdr + 4);

		if (flags & 1)

			return true;

	}

	return false;

}



static u16

nvbios_extdev_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)

{

drivers/gpu/drm/nouveau/nvkm/subdev/therm/ic.c

+3 −0
Original line number Diff line number Diff line
@@ -116,6 +116,9 @@ nvkm_therm_ic_ctor(struct nvkm_therm *therm) 
			return;

	}



	if (nvbios_extdev_skip_probe(bios))

		return;



	/* The vbios doesn't provide the address of an exisiting monitoring

	   device. Let's try our static list.

	 */

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