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drm/i915: Skip vswing programming for TBT

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In thunderbolt mode the PHY is owned by the thunderbolt controller.
We are not supposed to touch it. So skip the vswing programming
as well (we already skipped the other steps not applicable to TBT).

Touching this stuff could supposedly interfere with the PHY
programming done by the thunderbolt controller.

Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210128155948.13678-1-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
(cherry picked from commit f8c6b615b9)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2021-01-28 17:59:44 +02:00 committed by Jani Nikula
parent 1048ba83fb
commit eaf5bfe37d
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/display/intel_ddi.c
View file

@ -2754,6 +2754,9 @@ static void icl_mg_phy_ddi_vswing_sequence(struct intel_encoder *encoder,
int n_entries, ln;
u32 val;
if (enc_to_dig_port(encoder)->tc_mode == TC_PORT_TBT_ALT)
return;
ddi_translations = icl_get_mg_buf_trans(encoder, crtc_state, &n_entries);
if (level >= n_entries) {
drm_dbg_kms(&dev_priv->drm,
@ -2890,6 +2893,9 @@ tgl_dkl_phy_ddi_vswing_sequence(struct intel_encoder *encoder,
u32 val, dpcnt_mask, dpcnt_val;
int n_entries, ln;
if (enc_to_dig_port(encoder)->tc_mode == TC_PORT_TBT_ALT)
return;
ddi_translations = tgl_get_dkl_buf_trans(encoder, crtc_state, &n_entries);
if (level >= n_entries)