On Fri, 08 Feb 2019, Jani Nikula <jani.nik...@intel.com> wrote:
> The u32 version field encodes major version in the high word. We've been
> checking for version >= 0.2.
>
> Add opregion version logging while at it.
>
> Fixes: 04ebaadb9f2d ("drm/i915/opregion: handle VBT sizes bigger than 6 KB")
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Imre Deak <imre.d...@intel.com>
> Signed-off-by: Jani Nikula <jani.nik...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_opregion.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_opregion.c
> b/drivers/gpu/drm/i915/intel_opregion.c
> index 30ae96c5c97c..7e4152d97c45 100644
> --- a/drivers/gpu/drm/i915/intel_opregion.c
> +++ b/drivers/gpu/drm/i915/intel_opregion.c
> @@ -46,6 +46,9 @@
> #define OPREGION_ASLE_EXT_OFFSET 0x1C00
>
> #define OPREGION_SIGNATURE "IntelGraphicsMem"
> +
> +#define OPREGION_VERSION(major, minor) (((major) << 16) | (minor))
> +
> #define MBOX_ACPI (1<<0)
> #define MBOX_SWSCI (1<<1)
> #define MBOX_ASLE (1<<2)
> @@ -924,6 +927,10 @@ int intel_opregion_setup(struct drm_i915_private
> *dev_priv)
> opregion->header = base;
> opregion->lid_state = base + ACPI_CLID;
>
> + DRM_DEBUG_DRIVER("ACPI OpRegion version %u.%u\n",
> + opregion->header->opregion_ver >> 16,
> + opregion->header->opregion_ver & 0xffff);
> +
This is ridiculous and maddening. On our CI APL this prints [1]:
<7>[ 7.029368] [drm:intel_opregion_setup [i915]] ACPI OpRegion version 512.0
Yes, version 512.0.
Digging into it, I found one random version of the opregion spec that
has:
Bits [31:16] - Major Version Number
Bits [23:0] - Minor Version Number
The minor is supposed to be [15:0]. But this APL (maybe others, need to
investigate) has the major version encoded to bits 31:24.
This obviously screws up the opregion version check in patch 2 as well,
leading to relative RVDA being used.
Absolutely disgusting.
BR,
Jani.
[1]
https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_12175/fi-apl-guc/boot0.log
> mboxes = opregion->header->mboxes;
> if (mboxes & MBOX_ACPI) {
> DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
> @@ -952,8 +959,8 @@ int intel_opregion_setup(struct drm_i915_private
> *dev_priv)
> if (dmi_check_system(intel_no_opregion_vbt))
> goto out;
>
> - if (opregion->header->opregion_ver >= 2 && opregion->asle &&
> - opregion->asle->rvda && opregion->asle->rvds) {
> + if (opregion->header->opregion_ver >= OPREGION_VERSION(2, 0) &&
> + opregion->asle && opregion->asle->rvda && opregion->asle->rvds) {
> opregion->rvda = memremap(opregion->asle->rvda,
> opregion->asle->rvds,
> MEMREMAP_WB);
--
Jani Nikula, Intel Open Source Graphics Center
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