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author | Pierre Moreau <pierre.morrow@free.fr> | 2015-10-03 21:35:16 +0200 |
---|---|---|
committer | Ben Skeggs <bskeggs@redhat.com> | 2015-11-03 15:02:18 +1000 |
commit | 5d5b43f59bd214506265ea05a013229ff5291101 (patch) | |
tree | 48fc6b851325191454ab5404af6608e61aa3898f /drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c | |
parent | drm/nouveau/disp,pm: constify nvkm_object_func structures (diff) | |
download | linux-dev-5d5b43f59bd214506265ea05a013229ff5291101.tar.xz linux-dev-5d5b43f59bd214506265ea05a013229ff5291101.zip |
drm/nouveau/pci: Handle 5-bit and 8-bit tag field
If the hardware supports extended tag field (8-bit ones), then enable it.
This is usually done by the VBIOS, but not on some MBPs (see fdo#86537).
In case extended tag field is not supported, 5-bit tag field is used which
limits the possible number of requests to 32. Apparently bits 7:0 of
0x08841c stores some number of outstanding requests, so cap it to 32 if
extended tag is unsupported.
Fixes: fdo#86537
v2: Restrict changes to chipsets >= 0x84
v3:
* Add nvkm_pci_mask to pci.h
* Mask bit 8 before setting it
v4:
* Rename `add` argument of nvkm_pci_mask to `value`
* Move code from nvkm_pci_init to g84_pci_init and remove PCIe and chipset
checks
v5:
* Rebase code on latest PCI structure
* Restore PCIe check
* Fix namings in nvkm_pci_mask
* Rephrase part of the commit message
Signed-off-by: Pierre Moreau <pierre.morrow@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c index 8f3b00199d14..3faa6bfb895b 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c @@ -25,8 +25,32 @@ #include <core/pci.h> +void +g84_pci_init(struct nvkm_pci *pci) +{ + /* The following only concerns PCIe cards. */ + if (!pci_is_pcie(pci->pdev)) + return; + + /* Tag field is 8-bit long, regardless of EXT_TAG. + * However, if EXT_TAG is disabled, only the lower 5 bits of the tag + * field should be used, limiting the number of request to 32. + * + * Apparently, 0x041c stores some limit on the number of requests + * possible, so if EXT_TAG is disabled, limit that requests number to + * 32 + * + * Fixes fdo#86537 + */ + if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020) + nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100); + else + nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000); +} + static const struct nvkm_pci_func g84_pci_func = { + .init = g84_pci_init, .rd32 = nv40_pci_rd32, .wr08 = nv40_pci_wr08, .wr32 = nv40_pci_wr32, |