On Mon, Feb 26, 2018 at 10:42:37PM +0530, Ramalingam C wrote:
> HDCP1.4 key can be loaded, only when Power well #1 is enabled and cdclk
> is enabled. Using the I915 power well infrastruture, above requirement
> is verified.
>
> This patch enables the hdcp initialization for HSW, BDW, and BXT.
>
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
Reviewed-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_hdcp.c | 31 +++++++++++++++++++++++++++++--
> 1 file changed, 29 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
> index 7ea55fa46f41..95081aaa832a 100644
> --- a/drivers/gpu/drm/i915/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/intel_hdcp.c
> @@ -37,6 +37,33 @@ static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
> return 0;
> }
>
> +static bool hdcp_key_loadable(struct drm_i915_private *dev_priv)
> +{
> + struct i915_power_domains *power_domains = &dev_priv->power_domains;
> + struct i915_power_well *power_well;
> + bool enabled = false;
> +
> + mutex_lock(&power_domains->lock);
> +
> + /* PG1 (power well #1) needs to be enabled */
> + for_each_power_well(dev_priv, power_well) {
> + if (power_well->id == SKL_DISP_PW_1) {
> + enabled = power_well->ops->is_enabled(dev_priv,
> + power_well);
> + break;
> + }
> + }
> + mutex_unlock(&power_domains->lock);
> +
> + /*
> + * Another req for hdcp key loadability is enabled state of pll for
> + * cdclk. Without active crtc we wont land here. So we are assuming that
> + * cdclk is already on.
> + */
> +
> + return enabled;
> +}
> +
> static void intel_hdcp_clear_keys(struct drm_i915_private *dev_priv)
> {
> I915_WRITE(HDCP_KEY_CONF, HDCP_CLEAR_KEYS_TRIGGER);
> @@ -598,8 +625,8 @@ static int _intel_hdcp_enable(struct intel_connector *connector)
> DRM_DEBUG_KMS("[%s:%d] HDCP is being enabled...\n",
> connector->base.name, connector->base.base.id);
>
> - if (!(I915_READ(SKL_FUSE_STATUS) & SKL_FUSE_PG_DIST_STATUS(1))) {
> - DRM_ERROR("PG1 is disabled, cannot load keys\n");
> + if (!hdcp_key_loadable(dev_priv)) {
> + DRM_ERROR("HDCP key Load is not possible\n");
> return -ENXIO;
> }
>
> --
> 2.7.4
>
--
Sean Paul, Software Engineer, Google / Chromium OS
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