drm/i915/tgl: Add Wa_1608008084

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: ff690b2111ba ("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
(cherry picked from commit e94bda14325ccf1a519ffb516738d1201457f97f)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 4e292d4..173a7f2 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -575,24 +575,19 @@ 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