Quoting Jani Nikula (2018-09-06 09:21:26)
> With i915.dmc_firmware_path="" it's obvious the intention is to disable
> CSR firmware loading. Bypass the firmware request altogether in this
> case, with more obvious debug logging.
>
> Signed-off-by: Jani Nikula <jani.nik...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_csr.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_csr.c
> b/drivers/gpu/drm/i915/intel_csr.c
> index 956ac8bbf5e4..dbaeffddb5e7 100644
> --- a/drivers/gpu/drm/i915/intel_csr.c
> +++ b/drivers/gpu/drm/i915/intel_csr.c
> @@ -476,6 +476,12 @@ void intel_csr_ucode_init(struct drm_i915_private
> *dev_priv)
> }
>
> if (i915_modparams.dmc_firmware_path) {
> + if (strlen(i915_modparams.dmc_firmware_path) == 0) {
> + csr->fw_path = NULL;
> + DRM_DEBUG_KMS("Disabling CSR firmare and runtime
> PM\n");
In response to a user parameter, could even be DRM_INFO().
-Chris
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