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drm/i915/tgl: Initialize multicast register steering for workarounds

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Even though the bspec is missing gen12 register details for the MCR
selector register (0xFDC), this is confirmed by hardware folks to be a
mistake; the register does exist and we do indeed need to steer
multicast register reads to an appropriate instance the same as we did
on gen11.

Note that despite the lack of documentation we were still using the MCR
selector to read INSTDONE and such in read_subslice_reg() too.

Cc: Matt Atwood <matthew.s.atwood@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200414211118.2787489-4-matthew.d.roper@intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
This commit is contained in:
Matt Roper 2020-04-14 14:11:18 -07:00
parent 802101528b
commit 2a040f0d08
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/gt/intel_workarounds.c
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@ -943,6 +943,8 @@ icl_gt_workarounds_init(struct drm_i915_private *i915, struct i915_wa_list *wal)
static void
tgl_gt_workarounds_init(struct drm_i915_private *i915, struct i915_wa_list *wal)
{
wa_init_mcr(i915, wal);
/* Wa_1409420604:tgl */
if (IS_TGL_REVID(i915, TGL_REVID_A0, TGL_REVID_A0))
wa_write_or(wal,