From: Ville Syrjälä ville.syrjala@linux.intel.com
commit eaf5bfe37db871031232d2bf2535b6ca92afbad8 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.s... Reviewed-by: Imre Deak imre.deak@intel.com (cherry picked from commit f8c6b615b921d8a1bcd74870f9105e62b0bceff3) Signed-off-by: Jani Nikula jani.nikula@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/display/intel_ddi.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -2597,6 +2597,9 @@ static void icl_mg_phy_ddi_vswing_sequen 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 i 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);