drm/i915/tgl: Add new voltage swing table

This new HBR2 table for TGL-U and TGL-Y is required to pass
DisplayPort compliance.

BSpec: 49291
Cc: Khaled Almahallawy <khaled.almahallawy@intel.com>
Reviewed-by: Khaled Almahallawy<khaled.almahallawy@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200807192629.64134-2-jose.souza@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 714b2bc96f23cd0cd3d582047c1aa54205c0056a..de5b216561d8f1ea9d04888bf0e52a7f8bd86424 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -706,6 +706,20 @@ static const struct cnl_ddi_buf_trans tgl_combo_phy_ddi_translations_dp_hbr2[] =
        { 0x6, 0x7F, 0x3F, 0x00, 0x00 },        /* 900   900      0.0   */
 };
 
+static const struct cnl_ddi_buf_trans tgl_uy_combo_phy_ddi_translations_dp_hbr2[] = {
+                                               /* NT mV Trans mV db    */
+       { 0xA, 0x35, 0x3F, 0x00, 0x00 },        /* 350   350      0.0   */
+       { 0xA, 0x4F, 0x36, 0x00, 0x09 },        /* 350   500      3.1   */
+       { 0xC, 0x60, 0x32, 0x00, 0x0D },        /* 350   700      6.0   */
+       { 0xC, 0x7F, 0x2D, 0x00, 0x12 },        /* 350   900      8.2   */
+       { 0xC, 0x47, 0x3F, 0x00, 0x00 },        /* 500   500      0.0   */
+       { 0xC, 0x6F, 0x36, 0x00, 0x09 },        /* 500   700      2.9   */
+       { 0x6, 0x7D, 0x32, 0x00, 0x0D },        /* 500   900      5.1   */
+       { 0x6, 0x60, 0x3C, 0x00, 0x03 },        /* 650   700      0.6   */
+       { 0x6, 0x7F, 0x34, 0x00, 0x0B },        /* 600   900      3.5   */
+       { 0x6, 0x7F, 0x3F, 0x00, 0x00 },        /* 900   900      0.0   */
+};
+
 /*
  * Cloned the HOBL entry to comply with the voltage and pre-emphasis entries
  * that DisplayPort specification requires
@@ -1087,6 +1101,11 @@ tgl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
        if (type == INTEL_OUTPUT_HDMI || type == INTEL_OUTPUT_EDP) {
                return icl_get_combo_buf_trans(encoder, type, rate, n_entries);
        } else if (rate > 270000) {
+               if (IS_TGL_U(dev_priv) || IS_TGL_Y(dev_priv)) {
+                       *n_entries = ARRAY_SIZE(tgl_uy_combo_phy_ddi_translations_dp_hbr2);
+                       return tgl_uy_combo_phy_ddi_translations_dp_hbr2;
+               }
+
                *n_entries = ARRAY_SIZE(tgl_combo_phy_ddi_translations_dp_hbr2);
                return tgl_combo_phy_ddi_translations_dp_hbr2;
        }