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drm/i915: Skip vswing programming for TBT

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commit eaf5bfe37d upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ville Syrjälä 2021-01-28 17:59:44 +02:00 committed by Greg Kroah-Hartman
parent 43f39b85e9
commit 4e78c33874
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/display/intel_ddi.c
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@ -2597,6 +2597,9 @@ static void icl_mg_phy_ddi_vswing_sequence(struct intel_encoder *encoder,
u32 n_entries, val;
int ln, rate = 0;
if (enc_to_dig_port(encoder)->tc_mode == TC_PORT_TBT_ALT)
return;
if (type != INTEL_OUTPUT_HDMI) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
@ -2741,6 +2744,9 @@ tgl_dkl_phy_ddi_vswing_sequence(struct intel_encoder *encoder, int link_clock,
u32 n_entries, val, ln, dpcnt_mask, dpcnt_val;
int rate = 0;
if (enc_to_dig_port(encoder)->tc_mode == TC_PORT_TBT_ALT)
return;
if (type != INTEL_OUTPUT_HDMI) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);