[PATCH] drm/i915/display: Implement wa_16011342517

[Nemesa Garg]

Workaround to prevent skew violation on type-c
phy for DP 1.62 and HDMI.

Signed-off-by: Nemesa Garg <nemesa.garg at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c         | 16 ++++++++++++++++
 .../gpu/drm/i915/display/intel_dkl_phy_regs.h    |  4 ++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 74132c1d6385..34b372b18aab 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -77,6 +77,7 @@
 #include "intel_psr.h"
 #include "intel_quirks.h"
 #include "intel_snps_phy.h"
+#include "intel_step.h"
 #include "intel_tc.h"
 #include "intel_vdsc.h"
 #include "intel_vdsc_regs.h"
@@ -1439,6 +1440,21 @@ static void tgl_dkl_phy_set_signal_levels(struct intel_encoder *encoder,
 					  DKL_TX_DPCNTL2_CFG_LOADGENSELECT_TX2_MASK,
 					  val);
 		}
+
+		/* Wa_16011342517:adl-p */
+		if (display->platform.alderlake_p &&
+		    IS_DISPLAY_STEP(display, STEP_A0, STEP_D0)) {
+			if ((intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI) &&
+			     crtc_state->port_clock == 594000) ||
+			     (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP) &&
+			     crtc_state->port_clock == 162000)) {
+				intel_dkl_phy_rmw(display, DKLP_TX_DPCNTL2(tc_port),
+						  LOADGEN_SHARING_PMD_DISABLE, 1);
+			} else {
+				intel_dkl_phy_rmw(display, DKLP_TX_DPCNTL2(tc_port),
+						  LOADGEN_SHARING_PMD_DISABLE, 0);
+			}
+		}
 	}
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_dkl_phy_regs.h b/drivers/gpu/drm/i915/display/intel_dkl_phy_regs.h
index 56085b32956d..fa3bad5efca9 100644
--- a/drivers/gpu/drm/i915/display/intel_dkl_phy_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_dkl_phy_regs.h
@@ -188,6 +188,10 @@ struct intel_dkl_phy_reg {
 								 _DKL_CMN_UC_DW27)
 #define  DKL_CMN_UC_DW27_UC_HEALTH			(0x1 << 15)
 
+#define _DKLP_PCS_GLUE_TX_DPCNTL2                       0xB68
+#define DKLP_TX_DPCNTL2(tc_port)			_DKL_REG(tc_port, \
+								 _DKLP_PCS_GLUE_TX_DPCNTL2)
+#define LOADGEN_SHARING_PMD_DISABLE                     REG_BIT(12)
 /*
  * Each Dekel PHY is addressed through a 4KB aperture. Each PHY has more than
  * 4KB of register space, so a separate index is programmed in HIP_INDEX_REG0
-- 
2.25.1