drm/i915/xelpd: Handle new location of outputs D and E

The DDI naming template for display version 12 went A-C, TC1-TC6.  With
XE_LPD, that naming scheme for DDI's has now changed to A-E, TC1-TC4.

The XE_LPD design keeps the register offsets and bitfields relating to
the TC outputs in the same location they were previously.  The new "D"
and "E" outputs now take the locations that were previously used by TC5
and TC6 outputs, or what we would have considered to be outputs "H" and
"I" under the legacy lettering scheme.

For the most part everything will just work as long as we initialize the
output with the proper 'enum port' value.  However we do need to take
care to pick the correct AUX channel when parsing the VBT (e.g., a
reference to 'AUX D' is actually asking us to use the 8th aux channel,
not the fourth).  We should also make sure that our encoders and aux
channels are named appropriately so that it's easier to correlate driver
debug messages with the bspec instructions.

v2:
 - Update handling of TGL_TRANS_CLK_SEL_PORT.  (Jose)

v3:
 - Add hpd_pin to handle outputs D and E (Jose)
 - Fixed conversion of BIOS port to aux ch for TC ports (Jose)

Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210514153711.2359617-2-matthew.d.roper@intel.com

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c
index 805f6953c048..066760a2abb4 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
@@ -602,8 +602,8 @@ static i915_reg_t tgl_aux_ctl_reg(struct intel_dp *intel_dp)
 	case AUX_CH_USBC2:
 	case AUX_CH_USBC3:
 	case AUX_CH_USBC4:
-	case AUX_CH_USBC5:
-	case AUX_CH_USBC6:
+	case AUX_CH_USBC5:  /* aka AUX_CH_D_XELPD */
+	case AUX_CH_USBC6:  /* aka AUX_CH_E_XELPD */
 		return DP_AUX_CH_CTL(aux_ch);
 	default:
 		MISSING_CASE(aux_ch);
@@ -625,8 +625,8 @@ static i915_reg_t tgl_aux_data_reg(struct intel_dp *intel_dp, int index)
 	case AUX_CH_USBC2:
 	case AUX_CH_USBC3:
 	case AUX_CH_USBC4:
-	case AUX_CH_USBC5:
-	case AUX_CH_USBC6:
+	case AUX_CH_USBC5:  /* aka AUX_CH_D_XELPD */
+	case AUX_CH_USBC6:  /* aka AUX_CH_E_XELPD */
 		return DP_AUX_CH_DATA(aux_ch, index);
 	default:
 		MISSING_CASE(aux_ch);
@@ -680,7 +680,11 @@ void intel_dp_aux_init(struct intel_dp *intel_dp)
 	drm_dp_aux_init(&intel_dp->aux);
 
 	/* Failure to allocate our preferred name is not critical */
-	if (DISPLAY_VER(dev_priv) >= 12 && aux_ch >= AUX_CH_USBC1)
+	if (DISPLAY_VER(dev_priv) >= 13 && aux_ch >= AUX_CH_D_XELPD)
+		intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX %c/%s",
+					       aux_ch_name(aux_ch - AUX_CH_D_XELPD + AUX_CH_D),
+					       encoder->base.name);
+	else if (DISPLAY_VER(dev_priv) >= 12 && aux_ch >= AUX_CH_USBC1)
 		intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX USBC%c/%s",
 					       aux_ch - AUX_CH_USBC1 + '1',
 					       encoder->base.name);