Oscar Mateo <oscar.mateo@xxxxxxxxx> writes:
> Avoids a hang during soft reset.
>
> v2: Rebased on top of the WA refactoring
> v3: Added References (Mika)
> v4:
> - Rebased
> - C, not lisp (Chris)
> - Which steppings affected by this are not clear.
> For the moment, apply unconditionally as per the
> BSpec (Mika)
> - Add reference to another HSD also related
>
> References: HSDES#1405476379
> References: HSDES#2006612137
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 5 +++++
> drivers/gpu/drm/i915/intel_workarounds.c | 7 +++++++
> 2 files changed, 12 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index ce48427..1449178 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -9897,6 +9897,11 @@ enum skl_power_gate {
> /* Media decoder 2 MOCS registers */
> #define GEN11_MFX2_MOCS(i) _MMIO(0x10000 + (i) * 4)
>
> +#define GEN10_SCRATCH_LNCF2 _MMIO(0xb0a0)
> +#define PMFLUSHDONE_LNICRSDROP (1 << 20)
> +#define PMFLUSH_GAPL3UNBLOCK (1 << 21)
> +#define PMFLUSHDONE_LNEBLK (1 << 22)
> +
> /* gamt regs */
> #define GEN8_L3_LRA_1_GPGPU _MMIO(0x4dd4)
> #define GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_BDW 0x67F1427F /* max/min for LRA1/2 */
> diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
> index 942d322..5eec4ce 100644
> --- a/drivers/gpu/drm/i915/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/intel_workarounds.c
> @@ -761,6 +761,13 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
> I915_WRITE(INF_UNIT_LEVEL_CLKGATE,
> I915_READ(INF_UNIT_LEVEL_CLKGATE) |
> CGPSF_CLKGATE_DIS);
> +
> + /* WaForwardProgressSoftReset:icl */
> + I915_WRITE(GEN10_SCRATCH_LNCF2,
> + I915_READ(GEN10_SCRATCH_LNCF2) |
> + PMFLUSHDONE_LNICRSDROP |
> + PMFLUSH_GAPL3UNBLOCK |
> + PMFLUSHDONE_LNEBLK);
> }
>
> void intel_gt_workarounds_apply(struct drm_i915_private *dev_priv)
> --
> 1.9.1
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