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drm/i915/lnl+/tc: Use the cached max lane count value

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Use the cached max lane count value on LNL+, to account for scenarios
where this value is queried after the HW cleared the corresponding pin
assignment value in the TCSS_DDI_STATUS register after the sink got
disconnected.

For consistency, follow-up changes will use the cached max lane count
value on other platforms as well and will also cache the pin assignment
value in a similar way.

Cc: stable@vger.kernel.org # v6.8+
Reported-by: Charlton Lin <charlton.lin@intel.com>
Tested-by: Khaled Almahallawy <khaled.almahallawy@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250811080152.906216-5-imre.deak@intel.com
(cherry picked from commit afc4e84388079f4d5ba05271632b7a4d8d85165c)
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>
This commit is contained in:
Imre Deak 2025-08-11 11:01:51 +03:00 committed by Tvrtko Ursulin
parent c87514a0bb
commit c5c2b4b384
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/i915/display/intel_tc.c
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@ -395,12 +395,16 @@ static void read_pin_configuration(struct intel_tc_port *tc)
int intel_tc_port_max_lane_count(struct intel_digital_port *dig_port) int intel_tc_port_max_lane_count(struct intel_digital_port *dig_port)
{ {
struct intel_display *display = to_intel_display(dig_port);
struct intel_tc_port *tc = to_tc_port(dig_port); struct intel_tc_port *tc = to_tc_port(dig_port);
if (!intel_encoder_is_tc(&dig_port->base)) if (!intel_encoder_is_tc(&dig_port->base))
return 4; return 4;
return get_max_lane_count(tc); if (DISPLAY_VER(display) < 20)
return get_max_lane_count(tc);
return tc->max_lane_count;
} }
void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port, void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port,