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authorCaz Yokoyama <caz.yokoyama@intel.com>2021-03-24 13:04:59 -0700
committerLucas De Marchi <lucas.demarchi@intel.com>2021-04-08 23:41:19 -0700
commit2b5298b0aa09be3d789052107cb864603b88bc93 (patch)
tree5c56b532a3b6fa6db29f7d5c0026d27abf2d869b /drivers/gpu/drm/i915/gt/intel_workarounds.c
parent9c0fed84d5750e1eea6c664e073ffa2534a17743 (diff)
drm/i915/gen12: Add recommended hardware tuning value
Follow Bspec 31870 to set recommended tuning values for certain GT register. These values aren't workarounds per-se, but it's best to handle them in the same general area of the driver, especially since there may be real workarounds that update other bits of the same registers. At the moment the only value we need to worry about is the TDS_TIMER setting in FF_MODE2. This setting was previously described as "Wa_1604555607" on some platforms, but the spec tells us that we should continue to program this on all current gen12 platforms, even those that do not have that WA. Bspec: 31870 v2: Rephrase some comments to make them clearer (Matt) Cc: Clinton Taylor <clinton.a.taylor@intel.com> Signed-off-by: Caz Yokoyama <caz.yokoyama@intel.com> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210324200502.1731265-2-lucas.demarchi@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_workarounds.c')
-rw-r--r--drivers/gpu/drm/i915/gt/intel_workarounds.c48
1 files changed, 37 insertions, 11 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 2c6f7217469f..25785b46d1e4 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -607,9 +607,38 @@ static void icl_ctx_workarounds_init(struct intel_engine_cs *engine,
wa_masked_en(wal, GEN9_ROW_CHICKEN4, GEN11_DIS_PICK_2ND_EU);
}
+/*
+ * These settings aren't actually workarounds, but general tuning settings that
+ * need to be programmed on several platforms.
+ */
+static void gen12_ctx_gt_tuning_init(struct intel_engine_cs *engine,
+ struct i915_wa_list *wal)
+{
+ /*
+ * Although some platforms refer to it as Wa_1604555607, we need to
+ * program it even on those that don't explicitly list that
+ * workaround.
+ *
+ * Note that the programming of this register is further modified
+ * according to the FF_MODE2 guidance given by Wa_1608008084:gen12.
+ * Wa_1608008084 tells us the 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 TDS timer value. For the same reason read
+ * verification is ignored.
+ */
+ wa_add(wal,
+ FF_MODE2,
+ FF_MODE2_TDS_TIMER_MASK,
+ FF_MODE2_TDS_TIMER_128,
+ 0);
+}
+
static void gen12_ctx_workarounds_init(struct intel_engine_cs *engine,
struct i915_wa_list *wal)
{
+ gen12_ctx_gt_tuning_init(engine, wal);
+
/*
* Wa_1409142259:tgl
* Wa_1409347922:tgl
@@ -636,19 +665,15 @@ static void tgl_ctx_workarounds_init(struct intel_engine_cs *engine,
gen12_ctx_workarounds_init(engine, wal);
/*
- * Wa_1604555607:tgl,rkl
+ * Wa_16011163337
*
- * Note that the implementation of this workaround is further modified
- * according to the FF_MODE2 guidance given by 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 GS Timer
- * and TDS timer values for Wa_1604555607 and Wa_16011163337.
+ * Like in gen12_ctx_gt_tuning_init(), read verification is ignored due
+ * to Wa_1608008084.
*/
wa_add(wal,
FF_MODE2,
- FF_MODE2_GS_TIMER_MASK | FF_MODE2_TDS_TIMER_MASK,
- FF_MODE2_GS_TIMER_224 | FF_MODE2_TDS_TIMER_128,
+ FF_MODE2_GS_TIMER_MASK,
+ FF_MODE2_GS_TIMER_224,
0);
}
@@ -668,12 +693,13 @@ static void dg1_ctx_workarounds_init(struct intel_engine_cs *engine,
/*
* Wa_16011163337
*
- * Like in tgl_ctx_workarounds_init(), read verification is ignored due
+ * Like in gen12_ctx_gt_tuning_init(), read verification is ignored due
* to Wa_1608008084.
*/
wa_add(wal,
FF_MODE2,
- FF_MODE2_GS_TIMER_MASK, FF_MODE2_GS_TIMER_224, 0);
+ FF_MODE2_GS_TIMER_MASK,
+ FF_MODE2_GS_TIMER_224, 0);
}
static void