[PATCH v3] drm/i915/display: Implement wa_16011342517

[Nemesa Garg]

While doing voltage swing for type-c phy
for DP 1.62 and HDMI write the
LOADGEN_SHARING_PMD_DISABLE bit to 1.

-v2: Update commit.
     Add bspec[Suraj]
-v3: Move w/a before DKL_TX_PMD_LANE_SUS.
     Use DKL_TX_DPCNTL2[Ville]

Bspec: 55359
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    |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 4c845dd410a2..d99d4c80fe17 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"
@@ -1393,6 +1394,21 @@ static void tgl_dkl_phy_set_signal_levels(struct intel_encoder *encoder,
 	for (ln = 0; ln < 2; ln++) {
 		int level;
 
+		/* 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, DKL_TX_DPCNTL2(tc_port, ln),
+						  LOADGEN_SHARING_PMD_DISABLE, 1);
+			} else {
+				intel_dkl_phy_rmw(display, DKL_TX_DPCNTL2(tc_port, ln),
+						  LOADGEN_SHARING_PMD_DISABLE, 0);
+			}
+		}
+
 		intel_dkl_phy_write(display, DKL_TX_PMD_LANE_SUS(tc_port, ln), 0);
 
 		level = intel_ddi_level(encoder, crtc_state, 2*ln+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..ac2f92482d67 100644
--- a/drivers/gpu/drm/i915/display/intel_dkl_phy_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_dkl_phy_regs.h
@@ -151,6 +151,7 @@ struct intel_dkl_phy_reg {
 #define  DKL_TX_DPCNTL2_CFG_LOADGENSELECT_TX1(val)	REG_FIELD_PREP(DKL_TX_DPCNTL2_CFG_LOADGENSELECT_TX1_MASK, (val))
 #define  DKL_TX_DPCNTL2_CFG_LOADGENSELECT_TX2_MASK	REG_GENMASK(6, 5)
 #define  DKL_TX_DPCNTL2_CFG_LOADGENSELECT_TX2(val)	REG_FIELD_PREP(DKL_TX_DPCNTL2_CFG_LOADGENSELECT_TX2_MASK, (val))
+#define  LOADGEN_SHARING_PMD_DISABLE			REG_BIT(12)
 
 #define _DKL_TX_FW_CALIB_LN0				0x02F8
 #define _DKL_TX_FW_CALIB_LN1				0x12F8
-- 
2.25.1