Robert noticed that the FF_SLICE_CS_CHICKEN2 offset was wrong. Ooops. Ville noticed that the write was wrong since FF_SLICE_CS_CHICKEN2 is a masked register. Re-oops.
A wonder if went through 2 people while having roughly a bug per line... The problem was introduced in the original patch: commit 2caa3b260aa6a3d015352c07d1bce1461825fa6c Author: Damien Lespiau <[email protected]> Date: Mon Feb 9 19:33:20 2015 +0000 drm/i915/skl: Implement WaDisableChickenBitTSGBarrierAckForFFSliceCS v2: Also fix the register write (Ville) Reported-by: Robert Beckett <[email protected]> Reported-by: Ville Syrjälä <[email protected]> Cc: Robert Beckett <[email protected]> Cc: Ville Syrjälä <[email protected]> Cc: Nick Hoath <[email protected]> Signed-off-by: Damien Lespiau <[email protected]> --- drivers/gpu/drm/i915/i915_reg.h | 2 +- drivers/gpu/drm/i915/intel_pm.c | 3 +-- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 5436ab0..6a1875a 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -5718,7 +5718,7 @@ enum skl_disp_power_wells { #define HSW_NDE_RSTWRN_OPT 0x46408 #define RESET_PCH_HANDSHAKE_ENABLE (1<<4) -#define FF_SLICE_CS_CHICKEN2 0x02e4 +#define FF_SLICE_CS_CHICKEN2 0x20e4 #define GEN9_TSG_BARRIER_ACK_DISABLE (1<<8) /* GEN7 chicken */ diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 8812fff..e940a28 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -88,8 +88,7 @@ static void skl_init_clock_gating(struct drm_device *dev) /* WaDisableChickenBitTSGBarrierAckForFFSliceCS:skl */ I915_WRITE(FF_SLICE_CS_CHICKEN2, - I915_READ(FF_SLICE_CS_CHICKEN2) | - GEN9_TSG_BARRIER_ACK_DISABLE); + _MASKED_BIT_ENABLE(GEN9_TSG_BARRIER_ACK_DISABLE)); } if (INTEL_REVID(dev) <= SKL_REVID_E0) -- 2.1.0 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
