On Sat, Feb 16, 2019 at 11:07:03PM +0530, Ramalingam C wrote:
> HDCP transmitter is supposed to indicate the HDCP encryption status of
> the link through enc_en signals in a window of time called "window of
> opportunity" defined by HDCP HDMI spec.
>
> But on KBL this timing of signalling has an issue. To fix the issue this
> WA of resetting the signalling is required.
>
> v2:
> WA is moved into the toggle_signalling [Daniel]
> v3:
> Commit msg is rewritten with more information
> v4:
> Reviewed-by Daniel.
>
> Signed-off-by: Ramalingam C <ramalinga...@intel.com>
> Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
Merged all the i915 patches to dinq for 5.2.
Thanks, Daniel
> ---
> drivers/gpu/drm/i915/intel_hdmi.c | 42
> +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
> b/drivers/gpu/drm/i915/intel_hdmi.c
> index 6a3e400f54d7..c2c91e6645a5 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1083,10 +1083,44 @@ int intel_hdmi_hdcp_read_v_prime_part(struct
> intel_digital_port *intel_dig_port,
> return ret;
> }
>
> +static int kbl_repositioning_enc_en_signal(struct intel_connector *connector)
> +{
> + struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
> + struct drm_crtc *crtc = connector->base.state->crtc;
> + struct intel_crtc *intel_crtc = container_of(crtc,
> + struct intel_crtc, base);
> + u32 scanline;
> + int ret;
> +
> + for (;;) {
> + scanline = I915_READ(PIPEDSL(intel_crtc->pipe));
> + if (scanline > 100 && scanline < 200)
> + break;
> + usleep_range(25, 50);
> + }
> +
> + ret = intel_ddi_toggle_hdcp_signalling(&intel_dig_port->base, false);
> + if (ret) {
> + DRM_ERROR("Disable HDCP signalling failed (%d)\n", ret);
> + return ret;
> + }
> + ret = intel_ddi_toggle_hdcp_signalling(&intel_dig_port->base, true);
> + if (ret) {
> + DRM_ERROR("Enable HDCP signalling failed (%d)\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> static
> int intel_hdmi_hdcp_toggle_signalling(struct intel_digital_port
> *intel_dig_port,
> bool enable)
> {
> + struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
> + struct intel_connector *connector = hdmi->attached_connector;
> + struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> int ret;
>
> if (!enable)
> @@ -1098,6 +1132,14 @@ int intel_hdmi_hdcp_toggle_signalling(struct
> intel_digital_port *intel_dig_port,
> enable ? "Enable" : "Disable", ret);
> return ret;
> }
> +
> + /*
> + * WA: To fix incorrect positioning of the window of
> + * opportunity and enc_en signalling in KABYLAKE.
> + */
> + if (IS_KABYLAKE(dev_priv) && enable)
> + return kbl_repositioning_enc_en_signal(connector);
> +
> return 0;
> }
>
> --
> 2.7.4
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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