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drm/i915/tgl: Add Wa_1608008084

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Wa_1608008084 is an additional WA that applies to writes on FF_MODE2
register. We can't read it back either from CPU or GPU. Since the other
bits should be 0, recommendation to handle Wa_1604555607 is to actually
just write the timer value.

Do a write only and don't try to read it, neither before or after
the WA is applied.

Fixes: ff690b2111 ("drm/i915/tgl: Implement Wa_1604555607")
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/20200224191258.15668-1-lucas.demarchi@intel.com
This commit is contained in:
Lucas De Marchi 2020-02-24 11:12:58 -08:00
parent 041be4811f
commit e94bda1432
1 changed files with 7 additions and 12 deletions
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19
drivers/gpu/drm/i915/gt/intel_workarounds.c
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@ -580,24 +580,19 @@ static void icl_ctx_workarounds_init(struct intel_engine_cs *engine,
static void tgl_ctx_workarounds_init(struct intel_engine_cs *engine,
struct i915_wa_list *wal)
{
u32 val;
/* Wa_1409142259:tgl */
WA_SET_BIT_MASKED(GEN11_COMMON_SLICE_CHICKEN3,
GEN12_DISABLE_CPS_AWARE_COLOR_PIPE);
/* Wa_1604555607:tgl */
val = intel_uncore_read(engine->uncore, FF_MODE2);
val &= ~FF_MODE2_TDS_TIMER_MASK;
val |= FF_MODE2_TDS_TIMER_128;
/*
* FIXME: FF_MODE2 register is not readable till TGL B0. We can
* enable verification of WA from the later steppings, which enables
* the read of FF_MODE2.
* Wa_1604555607:gen12 and Wa_1608008084:gen12
* FF_MODE2 register will return the wrong value when read. The default
* value for this register is zero for all fields and there are no bit
* masks. So instead of doing a RMW we should just write the TDS timer
* value for Wa_1604555607.
*/
wa_add(wal, FF_MODE2, FF_MODE2_TDS_TIMER_MASK, val,
IS_TGL_REVID(engine->i915, TGL_REVID_A0, TGL_REVID_A0) ? 0 :
FF_MODE2_TDS_TIMER_MASK);
wa_add(wal, FF_MODE2, FF_MODE2_TDS_TIMER_MASK,
FF_MODE2_TDS_TIMER_128, 0);
}
static void