From: Sean Paul seanpaul@chromium.org
On HDCP disable, clear the repeater bit. This ensures if we connect a non-repeater sink after a repeater, the bit is in the state we expect.
Fixes: ee5e5e7a5e0f (drm/i915: Add HDCP framework + base implementation) Cc: Chris Wilson chris@chris-wilson.co.uk Cc: Ramalingam C ramalingam.c@intel.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Sean Paul seanpaul@chromium.org Cc: Jani Nikula jani.nikula@linux.intel.com Cc: Joonas Lahtinen joonas.lahtinen@linux.intel.com Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: intel-gfx@lists.freedesktop.org Cc: stable@vger.kernel.org # v4.17+ Reviewed-by: Ramalingam C ramalingam.c@intel.com Signed-off-by: Sean Paul seanpaul@chromium.org Link: https://patchwork.freedesktop.org/patch/msgid/20191212190230.188505-3-sean@p... #v2
Changes in v2: -Added to the set Changes in v3: -None I had previously agreed that clearing the rep_ctl bits on enable would also be a good idea. However when I committed that idea to code, it didn't look right. So let's rely on enables and disables being paired and everything outside of that will be considered a bug --- drivers/gpu/drm/i915/display/intel_hdcp.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c index eaab9008feef..c4394c8e10eb 100644 --- a/drivers/gpu/drm/i915/display/intel_hdcp.c +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c @@ -773,6 +773,7 @@ static int _intel_hdcp_disable(struct intel_connector *connector) struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); enum port port = intel_dig_port->base.port; enum transcoder cpu_transcoder = hdcp->cpu_transcoder; + u32 repeater_ctl; int ret;
DRM_DEBUG_KMS("[%s:%d] HDCP is being disabled...\n", @@ -787,6 +788,10 @@ static int _intel_hdcp_disable(struct intel_connector *connector) return -ETIMEDOUT; }
+ repeater_ctl = intel_hdcp_get_repeater_ctl(dev_priv, cpu_transcoder, + port); + I915_WRITE(HDCP_REP_CTL, I915_READ(HDCP_REP_CTL) & ~repeater_ctl); + ret = hdcp->shim->toggle_signalling(intel_dig_port, false); if (ret) { DRM_ERROR("Failed to disable HDCP signalling\n");