Implement the required WA sequence for KBL to fix the
incorrect positioning of the window of oppurtunity and enc_en
signalling.

Signed-off-by: Ramalingam C <ramalinga...@intel.com>
---
 drivers/gpu/drm/i915/intel_hdcp.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c 
b/drivers/gpu/drm/i915/intel_hdcp.c
index 42327ed30903..2b9e1b6d0b1e 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -12,6 +12,7 @@
 #include <linux/i2c.h>
 #include <linux/random.h>
 #include <linux/component.h>
+#include <linux/delay.h>
 
 #include "intel_drv.h"
 #include "i915_reg.h"
@@ -20,6 +21,27 @@
 #define ENCRYPT_STATUS_CHANGE_TIMEOUT_MS       50
 #define HDCP2_LC_RETRY_CNT                     3
 
+static void 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 intel_hdcp *hdcp = &connector->hdcp;
+       struct drm_crtc *crtc = connector->base.state->crtc;
+       struct intel_crtc *intel_crtc = container_of(crtc,
+                                                    struct intel_crtc, base);
+       u32 scanline;
+
+       for (;;) {
+               scanline = I915_READ(PIPEDSL(intel_crtc->pipe));
+               if (scanline > 100 && scanline < 200)
+                       break;
+               usleep_range(25, 50);
+       }
+
+       hdcp->shim->toggle_signalling(intel_dig_port, false);
+       hdcp->shim->toggle_signalling(intel_dig_port, true);
+}
+
 static
 bool intel_hdcp_is_ksv_valid(u8 *ksv)
 {
@@ -1382,6 +1404,13 @@ static int hdcp2_enable_encryption(struct 
intel_connector *connector)
        }
 
        if (I915_READ(HDCP2_STATUS_DDI(port)) & LINK_AUTH_STATUS) {
+               /*
+                * WA: To fix incorrect positioning of the window of
+                * opportunity and enc_en signalling in KABYLAKE.
+                */
+               if (IS_KABYLAKE(dev_priv) && hdcp->shim->toggle_signalling)
+                       kbl_repositioning_enc_en_signal(connector);
+
                /* Link is Authenticated. Now set for Encryption */
                I915_WRITE(HDCP2_CTL_DDI(port),
                           I915_READ(HDCP2_CTL_DDI(port)) |
-- 
2.7.4

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