Quoting Mika Kuoppala (2019-10-15 16:44:44)
> Avoid possible hang in CPSS unit.
>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gt/intel_workarounds.c | 5 +++++
> drivers/gpu/drm/i915/i915_reg.h | 3 +++
> 2 files changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index db7844daace9..b7d7fdc5ba90 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -897,6 +897,11 @@ icl_gt_workarounds_init(struct drm_i915_private *i915, struct i915_wa_list *wal)
> static void
> tgl_gt_workarounds_init(struct drm_i915_private *i915, struct i915_wa_list *wal)
> {
> + /* Wa_1409420604:tgl */
> + if (IS_TGL_REVID(i915, TGL_REVID_A0, TGL_REVID_A0))
> + wa_write_or(wal,
> + SUBSLICE_UNIT_LEVEL_CLKGATE2,
> + CPSSUNIT_CLKGATE_DIS);
> }
>
> static void
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 781ca18cb45b..51c3e7975d6b 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4054,6 +4054,9 @@ enum {
> #define SUBSLICE_UNIT_LEVEL_CLKGATE _MMIO(0x9524)
> #define GWUNIT_CLKGATE_DIS (1 << 16)
>
> +#define SUBSLICE_UNIT_LEVEL_CLKGATE2 _MMIO(0x9528)
> +#define CPSSUNIT_CLKGATE_DIS (1 << 9)
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris
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