TRANS_DDI_FUNC_CTL asks us to disable hdcp line rekeying when not in
hdcp 2.2 and we are not using an hdmi transcoder and it need to be
enabled when we are using an HDMI transcoder to enable HDCP 1.4.
We use intel_de_rmw cycles to update TRANS_DDI_FUNC_CTL register so
we cannot depend on the value being 0 by default everytime which calls
for seprate handling of HDCP 1.4 case.
Bspec: 69964, 50493, 50054
Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_hdcp.c | 28 +++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 8bca532d1176..54efba65ef5a 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -31,6 +31,32 @@
#define KEY_LOAD_TRIES 5
#define HDCP2_LC_RETRY_CNT 3
+static void
+intel_hdcp_enable_hdcp_line_rekeying(struct intel_encoder *encoder,
+ struct intel_hdcp *hdcp)
+{
+ struct intel_display *display = to_intel_display(encoder);
+
+ /* Here we assume HDMI is in TMDS mode of operation */
+ if (encoder->type != INTEL_OUTPUT_HDMI)
+ return;
+
+ if (DISPLAY_VER(display) >= 14) {
+ if (DISPLAY_VER(display) >= 30)
+ intel_de_rmw(display,
+ TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder),
+ XE3_TRANS_DDI_HDCP_LINE_REKEY_DISABLE, 0);
+ else if (IS_DISPLAY_VERx100_STEP(display, 1400, STEP_D0, STEP_FOREVER))
+ intel_de_rmw(display, MTL_CHICKEN_TRANS(hdcp->cpu_transcoder),
+ HDCP_LINE_REKEY_DISABLE, 0);
+ else if (IS_DISPLAY_VERx100_STEP(display, 1401, STEP_B0, STEP_FOREVER) ||
+ IS_DISPLAY_VERx100_STEP(display, 2000, STEP_B0, STEP_FOREVER))
+ intel_de_rmw(display,
+ TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder),
+ TRANS_DDI_HDCP_LINE_REKEY_DISABLE, 0);
+ }
+}
+
static void
intel_hdcp_disable_hdcp_line_rekeying(struct intel_encoder *encoder,
struct intel_hdcp *hdcp)
@@ -1051,6 +1077,8 @@ static int intel_hdcp1_enable(struct intel_connector *connector)
return ret;
}
+ intel_hdcp_enable_hdcp_line_rekeying(connector->encoder, hdcp);
+
/* Incase of authentication failures, HDCP spec expects reauth. */
for (i = 0; i < tries; i++) {
ret = intel_hdcp_auth(connector);
--
2.34.1
