Quoting Jackie Li (2018-03-02 02:16:45)
> +++ b/drivers/gpu/drm/i915/intel_wopcm.c
> @@ -219,3 +219,67 @@ int intel_wopcm_init(struct intel_wopcm *wopcm)
>
> return 0;
> }
> +
> +static inline int write_and_verify(struct drm_i915_private *dev_priv,
> + i915_reg_t reg, u32 val, u32 mask,
> + u32 locked_bit)
> +{
> + u32 reg_val;
> +
> + GEM_BUG_ON(val & ~mask);
> +
> + I915_WRITE(reg, val);
> +
> + reg_val = I915_READ(reg);
I guess I would have expected the error message here, with the wanted
value vs. what was in the register.
<SNIP>
> +err_out:
> + DRM_ERROR("Failed to init WOPCM registers:\n");
> + DRM_ERROR("DMA_GUC_WOPCM_OFFSET=%#x\n",
> + I915_READ(DMA_GUC_WOPCM_OFFSET));
> + DRM_ERROR("GUC_WOPCM_SIZE=%#x\n", I915_READ(GUC_WOPCM_SIZE));
As this doesn't really give information what were the computed write
values. But if you see this is most useful for debuggin, this is;
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Regards, Joonas
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