From: Suraj Kandpal Date: Wed, 4 Feb 2026 02:32:47 +0000 (+0530) Subject: drm/i915/ltphy: Return true for TBT scenario during lt_phy_state compare X-Git-Tag: v7.1-rc1~167^2~24^2~172 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=58bb61161ee121b09bd61ad26ed424c4db5c03c2;p=thirdparty%2Flinux.git 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 --- diff --git a/drivers/gpu/drm/i915/display/intel_lt_phy.c b/drivers/gpu/drm/i915/display/intel_lt_phy.c index 04f63bdd0b87d..27ad8407606b8 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