6.16-stable review patch. If anyone has any objections, please let me know.
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From: Imre Deak imre.deak@intel.com
commit c5c2b4b3841666be3a45346d0ffa96b4b143504e upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/display/intel_tc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/display/intel_tc.c +++ b/drivers/gpu/drm/i915/display/intel_tc.c @@ -394,12 +394,16 @@ static void read_pin_configuration(struc
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);
if (!intel_encoder_is_tc(&dig_port->base)) 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,