[PATCH] drm/i915/xe3lpd: Disable HDCP Line Rekeying for Xe3

[Suraj Kandpal]

We need to disable HDCP Line Rekeying for Xe3 when we are using an HDMI
encoder. Also remove the Wa comment tag as this follows the bspec and
does not implement the wa.

v2: add additional definition instead of function, commit message typo
fix and update.
v3: restore lost conditional from v2.
v4: subject line and subject message updated, fix the if ladder order,
fix the bit definition order.
v5: Add the bspec link and remove the Wa comment tag

Bspec: 69964
Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_hdcp.c | 11 +++++++----
 drivers/gpu/drm/i915/i915_reg.h           |  1 +
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index ed6aa87403e2..7a32bfef8d87 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -31,7 +31,6 @@
 #define KEY_LOAD_TRIES	5
 #define HDCP2_LC_RETRY_CNT			3
 
-/* WA: 16022217614 */
 static void
 intel_hdcp_disable_hdcp_line_rekeying(struct intel_encoder *encoder,
 				      struct intel_hdcp *hdcp)
@@ -43,14 +42,18 @@ intel_hdcp_disable_hdcp_line_rekeying(struct intel_encoder *encoder,
 		return;
 
 	if (DISPLAY_VER(display) >= 14) {
-		if (IS_DISPLAY_VER_STEP(display, IP_VER(14, 0), STEP_D0, STEP_FOREVER))
-			intel_de_rmw(display, MTL_CHICKEN_TRANS(hdcp->cpu_transcoder),
-				     0, HDCP_LINE_REKEY_DISABLE);
+		if (DISPLAY_VER(display) >= 30)
+			intel_de_rmw(display,
+				     TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder),
+				     0, XE3_TRANS_DDI_HDCP_LINE_REKEY_DISABLE);
 		else if (IS_DISPLAY_VER_STEP(display, IP_VER(14, 1), STEP_B0, STEP_FOREVER) ||
 			 IS_DISPLAY_VER_STEP(display, IP_VER(20, 0), STEP_B0, STEP_FOREVER))
 			intel_de_rmw(display,
 				     TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder),
 				     0, TRANS_DDI_HDCP_LINE_REKEY_DISABLE);
+		else if (IS_DISPLAY_VER_STEP(display, IP_VER(14, 0), STEP_D0, STEP_FOREVER))
+			intel_de_rmw(display, MTL_CHICKEN_TRANS(hdcp->cpu_transcoder),
+				     0, HDCP_LINE_REKEY_DISABLE);
 	}
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 405f409e9761..184420011a88 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3816,6 +3816,7 @@ enum skl_power_gate {
 #define  TRANS_DDI_PVSYNC		(1 << 17)
 #define  TRANS_DDI_PHSYNC		(1 << 16)
 #define  TRANS_DDI_PORT_SYNC_ENABLE	REG_BIT(15)
+#define  XE3_TRANS_DDI_HDCP_LINE_REKEY_DISABLE	REG_BIT(15)
 #define  TRANS_DDI_EDP_INPUT_MASK	(7 << 12)
 #define  TRANS_DDI_EDP_INPUT_A_ON	(0 << 12)
 #define  TRANS_DDI_EDP_INPUT_A_ONOFF	(4 << 12)
-- 
2.34.1