drm/i915/dg1: Update voltage swing tables for DP

DG1's vswing tables are the same for eDP and HDMI but have slight
differences from ICL/TGL for DP.

v2:
 - Use a "_hbr2_hbr3" suffix on the table name to make it more clear
   that the same table is used for both HBR2 and HBR3 link rates.
   (Swathi)

Bspec: 49291
Cc: Clinton Taylor <Clinton.A.Taylor@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Cc: Swathi Dhanavanthri <swathi.dhanavanthri@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210108222528.1954514-1-matthew.d.roper@intel.com
Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index e90d1af1a54d2a0fbede82f516e681c0eb4549c6..ef98480014185a39bbf15f7408e870453357d60f 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -611,6 +611,34 @@ static const struct cnl_ddi_buf_trans jsl_combo_phy_ddi_translations_edp_hbr2[]
        { 0xA, 0x35, 0x3F, 0x00, 0x00 },        /* 350   350      0.0   */
 };
 
+static const struct cnl_ddi_buf_trans dg1_combo_phy_ddi_translations_dp_rbr_hbr[] = {
+                                               /* NT mV Trans mV db    */
+       { 0xA, 0x32, 0x3F, 0x00, 0x00 },        /* 350   350      0.0   */
+       { 0xA, 0x48, 0x35, 0x00, 0x0A },        /* 350   500      3.1   */
+       { 0xC, 0x63, 0x2F, 0x00, 0x10 },        /* 350   700      6.0   */
+       { 0x6, 0x7F, 0x2C, 0x00, 0x13 },        /* 350   900      8.2   */
+       { 0xA, 0x43, 0x3F, 0x00, 0x00 },        /* 500   500      0.0   */
+       { 0xC, 0x60, 0x36, 0x00, 0x09 },        /* 500   700      2.9   */
+       { 0x6, 0x7F, 0x30, 0x00, 0x0F },        /* 500   900      5.1   */
+       { 0xC, 0x60, 0x3F, 0x00, 0x00 },        /* 650   700      0.6   */
+       { 0x6, 0x7F, 0x37, 0x00, 0x08 },        /* 600   900      3.5   */
+       { 0x6, 0x7F, 0x3F, 0x00, 0x00 },        /* 900   900      0.0   */
+};
+
+static const struct cnl_ddi_buf_trans dg1_combo_phy_ddi_translations_dp_hbr2_hbr3[] = {
+                                               /* NT mV Trans mV db    */
+       { 0xA, 0x32, 0x3F, 0x00, 0x00 },        /* 350   350      0.0   */
+       { 0xA, 0x48, 0x35, 0x00, 0x0A },        /* 350   500      3.1   */
+       { 0xC, 0x63, 0x2F, 0x00, 0x10 },        /* 350   700      6.0   */
+       { 0x6, 0x7F, 0x2C, 0x00, 0x13 },        /* 350   900      8.2   */
+       { 0xA, 0x43, 0x3F, 0x00, 0x00 },        /* 500   500      0.0   */
+       { 0xC, 0x60, 0x36, 0x00, 0x09 },        /* 500   700      2.9   */
+       { 0x6, 0x7F, 0x30, 0x00, 0x0F },        /* 500   900      5.1   */
+       { 0xC, 0x58, 0x3F, 0x00, 0x00 },        /* 650   700      0.6   */
+       { 0x6, 0x7F, 0x35, 0x00, 0x0A },        /* 600   900      3.5   */
+       { 0x6, 0x7F, 0x3F, 0x00, 0x00 },        /* 900   900      0.0   */
+};
+
 struct icl_mg_phy_ddi_buf_trans {
        u32 cri_txdeemph_override_11_6;
        u32 cri_txdeemph_override_5_0;
@@ -1121,6 +1149,12 @@ icl_get_combo_buf_trans_edp(struct intel_encoder *encoder,
        } else if (dev_priv->vbt.edp.low_vswing) {
                *n_entries = ARRAY_SIZE(icl_combo_phy_ddi_translations_edp_hbr2);
                return icl_combo_phy_ddi_translations_edp_hbr2;
+       } else if (IS_DG1(dev_priv) && crtc_state->port_clock > 270000) {
+               *n_entries = ARRAY_SIZE(dg1_combo_phy_ddi_translations_dp_hbr2_hbr3);
+               return dg1_combo_phy_ddi_translations_dp_hbr2_hbr3;
+       } else if (IS_DG1(dev_priv)) {
+               *n_entries = ARRAY_SIZE(dg1_combo_phy_ddi_translations_dp_rbr_hbr);
+               return dg1_combo_phy_ddi_translations_dp_rbr_hbr;
        }
 
        return icl_get_combo_buf_trans_dp(encoder, crtc_state, n_entries);