From 58bb61161ee121b09bd61ad26ed424c4db5c03c2 Mon Sep 17 00:00:00 2001 From: Suraj Kandpal Date: Wed, 4 Feb 2026 08:02:47 +0530 Subject: [PATCH] drm/i915/ltphy: Return true for TBT scenario during lt_phy_state compare TBT PHY is enablement/disablement is handled by its own TBT module. We do not play a big part in it's state management, that being take care by it's own TBT modeule. The PHY/PLL TypeC mode (TBT, DP-alt) can change after the PLL state was computed for a modeset, so the state verification after the modeset sequence would indicate a mismatch in case the mode changed from DP-alt to TBT, or from TBT to DP-alt mode. To avoid such a mismatch error the verification is skipped if the mode for either the read-out or the computed state is TBT (where that TBT PLL state doesn't reflect anyway the PLL's actual HW state). Simply return true when we are in tbt mode. Signed-off-by: Suraj Kandpal Reviewed-by: Imre Deak Link: https://patch.msgid.link/20260204023247.1560196-1-suraj.kandpal@intel.com --- drivers/gpu/drm/i915/display/intel_lt_phy.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_lt_phy.c b/drivers/gpu/drm/i915/display/intel_lt_phy.c index 04f63bdd0b87..27ad8407606b 100644 --- a/drivers/gpu/drm/i915/display/intel_lt_phy.c +++ b/drivers/gpu/drm/i915/display/intel_lt_phy.c @@ -2158,6 +2158,9 @@ bool intel_lt_phy_pll_compare_hw_state(const struct intel_lt_phy_pll_state *a, const struct intel_lt_phy_pll_state *b) { + if (a->tbt_mode || b->tbt_mode) + return true; + /* * With LT PHY values other than VDR0_CONFIG and VDR2_CONFIG are * unreliable. They cannot always be read back since internally