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 Link: https://patchwork.freedesktop.org/patch/msgid/20200117193103.156821-3-sean@p... #v3

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 Changes in v4: -s/I915_(READ|WRITE)/intel_de_(read|write)/ --- drivers/gpu/drm/i915/display/intel_hdcp.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c index de996f4f56997..f31a2f5d51a17 100644 --- a/drivers/gpu/drm/i915/display/intel_hdcp.c +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c @@ -790,6 +790,7 @@ static int _intel_hdcp_disable(struct intel_connector *connector) struct intel_hdcp *hdcp = &connector->hdcp; enum port port = intel_dig_port->base.port; enum transcoder cpu_transcoder = hdcp->cpu_transcoder; + u32 repeater_ctl; int ret;

drm_dbg_kms(&dev_priv->drm, "[%s:%d] HDCP is being disabled...\n", @@ -805,6 +806,11 @@ static int _intel_hdcp_disable(struct intel_connector *connector) return -ETIMEDOUT; }

+ repeater_ctl = intel_hdcp_get_repeater_ctl(dev_priv, cpu_transcoder, + port); + intel_de_write(dev_priv, HDCP_REP_CTL, + intel_de_read(dev_priv, HDCP_REP_CTL) & ~repeater_ctl); + ret = hdcp->shim->toggle_signalling(intel_dig_port, false); if (ret) { drm_err(&dev_priv->drm, "Failed to disable HDCP signalling\n");