Apparently the new gen9_bc platforms that Intel has introduced don't
provide us with a STRAP config register to read from for initializing DDI
B, C, and D detection. So, workaround this by hard-coding our strap config
in intel_setup_outputs().
Changes since v4:
* Split this into it's own commit
Cc: Matt Roper <matthew.d.ro...@intel.com>
Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
[originally from Tejas's work]
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadh...@intel.com>
Signed-off-by: Lyude Paul <ly...@redhat.com>
---
drivers/gpu/drm/i915/display/intel_display.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c
b/drivers/gpu/drm/i915/display/intel_display.c
index beed08c00b6c..4dee37f8659d 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -11943,7 +11943,14 @@ static void intel_setup_outputs(struct
drm_i915_private *dev_priv)
/* DDI B, C, D, and F detection is indicated by the SFUSE_STRAP
* register */
- found = intel_de_read(dev_priv, SFUSE_STRAP);
+ if (HAS_PCH_TGP(dev_priv)) {
+ /* W/A due to lack of STRAP config on TGP PCH*/
+ found = (SFUSE_STRAP_DDIB_DETECTED |
+ SFUSE_STRAP_DDIC_DETECTED |
+ SFUSE_STRAP_DDID_DETECTED);
+ } else {
+ found = intel_de_read(dev_priv, SFUSE_STRAP);
+ }
if (found & SFUSE_STRAP_DDIB_DETECTED)
intel_ddi_init(dev_priv, PORT_B);
--
2.29.2
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