From: Imre Deak <imre.deak@xxxxxxxxx> commit 67165722c27cc46de112a4e10b450170c8980a6f upstream. An enabled TC MST port holds one TC port link reference, regardless of the number of enabled streams on it, but the TC port HW readout takes one reference for each active MST stream. Fix the HW readout, taking only one reference for MST ports. This didn't cause an actual problem, since the encoder HW readout doesn't yet support reading out the MST HW state. Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Reviewed-by: Mika Kahola <mika.kahola@xxxxxxxxx> Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20230316131724.359612-3-imre.deak@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_tc.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) --- a/drivers/gpu/drm/i915/display/intel_tc.c +++ b/drivers/gpu/drm/i915/display/intel_tc.c @@ -683,11 +683,14 @@ static void intel_tc_port_update_mode(st tc_cold_unblock(dig_port, domain, wref); } -static void -intel_tc_port_link_init_refcount(struct intel_digital_port *dig_port, - int refcount) +static void __intel_tc_port_get_link(struct intel_digital_port *dig_port) { - dig_port->tc_link_refcount = refcount; + dig_port->tc_link_refcount++; +} + +static void __intel_tc_port_put_link(struct intel_digital_port *dig_port) +{ + dig_port->tc_link_refcount--; } /** @@ -713,7 +716,7 @@ void intel_tc_port_init_mode(struct inte dig_port->tc_mode = intel_tc_port_get_current_mode(dig_port); /* Prevent changing dig_port->tc_mode until intel_tc_port_sanitize_mode() is called. */ - intel_tc_port_link_init_refcount(dig_port, 1); + __intel_tc_port_get_link(dig_port); dig_port->tc_lock_wakeref = tc_cold_block(dig_port, &dig_port->tc_lock_power_domain); tc_cold_unblock(dig_port, domain, tc_cold_wref); @@ -749,8 +752,6 @@ void intel_tc_port_sanitize_mode(struct active_links = to_intel_crtc(encoder->base.crtc)->active; drm_WARN_ON(&i915->drm, dig_port->tc_link_refcount != 1); - intel_tc_port_link_init_refcount(dig_port, active_links); - if (active_links) { if (!icl_tc_phy_is_connected(dig_port)) drm_dbg_kms(&i915->drm, @@ -769,6 +770,7 @@ void intel_tc_port_sanitize_mode(struct dig_port->tc_port_name, tc_port_mode_name(dig_port->tc_mode)); icl_tc_phy_disconnect(dig_port); + __intel_tc_port_put_link(dig_port); tc_cold_unblock(dig_port, dig_port->tc_lock_power_domain, fetch_and_zero(&dig_port->tc_lock_wakeref)); @@ -880,14 +882,14 @@ void intel_tc_port_get_link(struct intel int required_lanes) { __intel_tc_port_lock(dig_port, required_lanes); - dig_port->tc_link_refcount++; + __intel_tc_port_get_link(dig_port); intel_tc_port_unlock(dig_port); } void intel_tc_port_put_link(struct intel_digital_port *dig_port) { intel_tc_port_lock(dig_port); - --dig_port->tc_link_refcount; + __intel_tc_port_put_link(dig_port); intel_tc_port_unlock(dig_port); /*
