On 28/09/2015 09:44, Jani Nikula wrote:
On Fri, 25 Sep 2015, Arun Siluvery <[email protected]> wrote:
Dropping it because it is for pre-production stepping.
Hum, why have we added a pre-pro w/a without a stepping check... should
we backport this to stable kernels? What's the impact on production
hardware with vs. without the w/a?
The original patch that added pre-production comment is very old.
commit 101b376d358e2f724db5e0ac4d207079b16c4754
Author: Rodrigo Vivi <[email protected]>
Date: Thu Oct 9 07:11:47 2014 -0700
drm/i915/bdw: Remove BDW preproduction W/As until C stepping.
Let's clean this a bit
v2: Rebase after other Mika's patch that removed some BDW
production workarounds.
v3: Removed stepping info.
For BDW it is only applicable UNTIL_D0. According to hsd it is related
to a hang in emulation but I am checking with HW team to understand its
impact (if any) better in production steppings.
regards
Arun
BR,
Jani.
Signed-off-by: Arun Siluvery <[email protected]>
---
drivers/gpu/drm/i915/intel_ringbuffer.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index d8fa9d1..0b545cf 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -827,9 +827,6 @@ static int bdw_init_workarounds(struct intel_engine_cs
*ring)
if (ret)
return ret;
- /* WaDisableThreadStallDopClockGating:bdw (pre-production) */
- WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN, STALL_DOP_GATING_DISABLE);
-
/* WaDisableDopClockGating:bdw */
WA_SET_BIT_MASKED(GEN7_ROW_CHICKEN2,
DOP_CLOCK_GATING_DISABLE);
--
1.9.1
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