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 <ramalingam.c@xxxxxxxxx>
---
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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