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drm/i915/dg1: Wait for pcode/uncore handshake at startup

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[ Upstream commit f9c730ede7d3f40900cb493890d94d868ff2f00f ]

DG1 does some additional pcode/uncore handshaking at
boot time; this handshaking must complete before various other pcode
commands are effective and before general work is submitted to the GPU.
We need to poll a new pcode mailbox during startup until it reports that
this handshaking is complete.

The bspec doesn't give guidance on how long we may need to wait for this
handshaking to complete.  For now, let's just set a really long timeout;
if we still don't get a completion status by the end of that timeout,
we'll just continue on and hope for the best.

v2 (Lucas): Rename macros to make clear the relation between command and
   result (requested by José)

Bspec: 52065
Cc: Clinton Taylor <Clinton.A.Taylor@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201001063917.3133475-2-lucas.demarchi@intel.com
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matt Roper
2023-06-15 13:39:08 +02:00
committed by Greg Kroah-Hartman
parent 2d1c19597d
commit 27458487c8
4 changed files with 23 additions and 0 deletions
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15
drivers/gpu/drm/i915/intel_sideband.c
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@@ -555,3 +555,18 @@ out:
return ret ? ret : status;
#undef COND
}
void intel_pcode_init(struct drm_i915_private *i915)
{
int ret;
if (!IS_DGFX(i915))
return;
ret = skl_pcode_request(i915, DG1_PCODE_STATUS,
DG1_UNCORE_GET_INIT_STATUS,
DG1_UNCORE_INIT_STATUS_COMPLETE,
DG1_UNCORE_INIT_STATUS_COMPLETE, 50);
if (ret)
drm_err(&i915->drm, "Pcode did not report uncore initialization completion!\n");
}