Quoting Saichandana S (2021-01-15 13:01:10)
> +static int i915_pm_req_res_info(struct seq_file *m, void *unused)
> +{
> + struct drm_i915_private *i915 = node_to_i915(m->private);
> + struct intel_csr *csr = &i915->csr;
> + u32 DC9_status;
> +
> + if (!HAS_CSR(i915))
> + return -ENODEV;
> + if (!csr->dmc_payload)
> + return 0;
> + DC9_status = intel_de_read(i915, PM_RSP_DBG_1) & PM_RESP_DC9_READY;
A read without waking the device up? Wait until IGT sees this.
[wrap with with_intel_runtime_pm(&i915->runtime_pm, wakeref)]
-Chris
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