Lane reversal happens only in the FIA module for TBT-alt/DP-alt mode, so WARN if lane reversal is attempted at a different level. See the BSpec DDI_BUF_CTL register description.
Cc: Manasi Navare <[email protected]> Cc: José Roberto de Souza <[email protected]> Cc: Rodrigo Vivi <[email protected]> Signed-off-by: Imre Deak <[email protected]> Reviewed-by: José Roberto de Souza <[email protected]> --- drivers/gpu/drm/i915/display/intel_ddi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index 97611b3bd302..ea7122209ddd 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -3604,6 +3604,8 @@ static void intel_ddi_set_fia_lane_count(struct intel_encoder *encoder, u32 val = I915_READ(PORT_TX_DFLEXDPMLE1); bool lane_reversal = dig_port->saved_port_bits & DDI_BUF_PORT_REVERSAL; + WARN_ON(lane_reversal && dig_port->tc_mode != TC_PORT_LEGACY); + val &= ~DFLEXDPMLE1_DPMLETC_MASK(tc_port); switch (pipe_config->lane_count) { case 1: -- 2.17.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
