Disable HDCP Line Rekeying when HDCP ver > 1.4 and when we are
on HDMI TMDS operation for DISPLAY_VER >= 14.
--v2
-Wa to be mentioned in comments not in commit message [Jani]
-Remove blankline [Jani]
--v3
-No need to write what is being done in comments when code
is self explanatory [Jani]
--v4
-Add comment regarding need of this WA when in TMDS mode
[Chaitanya]
-Write in chicken register for MTL [CHaitanya]
Bspec: 49273
Bspec: 69964
Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_hdcp.c | 26 +++++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 4 ++++
2 files changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index d5ed4c7dfbc0..0d8ae6962d34 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -30,6 +30,30 @@
#define KEY_LOAD_TRIES 5
#define HDCP2_LC_RETRY_CNT 3
+/*
+ * WA: 16022217614
+ * Disable HDCP line rekeying if we are using HDMI and in
+ * TMDS mode.
+ */
+static void
+intel_hdcp_disable_hdcp_line_rekeying(struct intel_encoder *encoder,
+ struct intel_hdcp *hdcp)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+
+ if (encoder->type != INTEL_OUTPUT_HDMI)
+ return;
+
+ if (DISPLAY_VER(dev_priv) >= 14) {
+ if (IS_METEORLAKE(dev_priv))
+ intel_de_rmw(dev_priv, MTL_CHICKEN_TRANS(hdcp->cpu_transcoder),
+ HDCP_LINE_REKEY_DISABLE, 1);
+ else
+ intel_de_rmw(dev_priv, TRANS_DDI_FUNC_CTL(hdcp->cpu_transcoder),
+ TRANS_DDI_HDCP_LINE_REKEY_DISABLE, 1);
+ }
+}
+
static int intel_conn_to_vcpi(struct intel_atomic_state *state,
struct intel_connector *connector)
{
@@ -2005,6 +2029,8 @@ static int _intel_hdcp2_enable(struct intel_atomic_state *state,
connector->base.base.id, connector->base.name,
hdcp->content_type);
+ intel_hdcp_disable_hdcp_line_rekeying(connector->encoder, hdcp);
+
ret = hdcp2_authenticate_and_encrypt(state, connector);
if (ret) {
drm_dbg_kms(&i915->drm, "HDCP2 Type%d Enabling Failed. (%d)\n",
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3f34efcd7d6c..39b1a2d516fe 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4613,6 +4613,8 @@
[TRANSCODER_D] = _CHICKEN_TRANS_D))
#define _MTL_CHICKEN_TRANS_A 0x604e0
#define _MTL_CHICKEN_TRANS_B 0x614e0
+#define _MTL_CHICKEN_TRANS_C 0x624e0
+#define _MTL_CHICKEN_TRANS_D 0x634e0
#define MTL_CHICKEN_TRANS(trans) _MMIO_TRANS((trans), \
_MTL_CHICKEN_TRANS_A, \
_MTL_CHICKEN_TRANS_B)
@@ -4631,6 +4633,7 @@
#define DP_FEC_BS_JITTER_WA REG_BIT(15)
#define PSR2_VSC_ENABLE_PROG_HEADER REG_BIT(12)
#define DP_DSC_INSERT_SF_AT_EOL_WA REG_BIT(4)
+#define HDCP_LINE_REKEY_DISABLE REG_BIT(0)
#define DISP_ARB_CTL _MMIO(0x45000)
#define DISP_FBC_MEMORY_WAKE REG_BIT(31)
@@ -5630,6 +5633,7 @@ enum skl_power_gate {
#define TRANS_DDI_EDP_INPUT_B_ONOFF (5 << 12)
#define TRANS_DDI_EDP_INPUT_C_ONOFF (6 << 12)
#define TRANS_DDI_EDP_INPUT_D_ONOFF (7 << 12)
+#define TRANS_DDI_HDCP_LINE_REKEY_DISABLE REG_BIT(12)
#define TRANS_DDI_MST_TRANSPORT_SELECT_MASK REG_GENMASK(11, 10)
#define TRANS_DDI_MST_TRANSPORT_SELECT(trans) \
REG_FIELD_PREP(TRANS_DDI_MST_TRANSPORT_SELECT_MASK, trans)
--
2.43.2
