From 70da7521e11939ebf2e3d2b4cd91d30d0d02e3c4 Mon Sep 17 00:00:00 2001
From: Lyude Paul <lyude@redhat.com>
Date: Tue, 9 Feb 2021 15:11:09 -0500
Subject: [PATCH] drm/i915/gen9_bc: Add W/A for missing STRAP config on TGP PCH + CML combos
Git-commit: 70da7521e11939ebf2e3d2b4cd91d30d0d02e3c4
Patch-mainline: v5.13-rc1
References: bsc#1188700
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.roper@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
[originally from Tejas's work]
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210209212832.1401815-5-lyude@redhat.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 6e71d39f343e..8df65d698476 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -11954,7 +11954,14 @@ 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);
--
2.26.2