From 67165722c27cc46de112a4e10b450170c8980a6f Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Thu, 16 Mar 2023 15:17:12 +0200 Subject: [PATCH] drm/i915/tc: Fix TC port link ref init for DP MST during HW readout MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Ville Syrjälä Reviewed-by: Mika Kahola Reviewed-by: Andrzej Hajda Link: https://patchwork.freedesktop.org/patch/msgid/20230316131724.359612-3-imre.deak@intel.com --- drivers/gpu/drm/i915/display/intel_tc.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c index 050f998..0b6fe96 100644 --- a/drivers/gpu/drm/i915/display/intel_tc.c +++ b/drivers/gpu/drm/i915/display/intel_tc.c @@ -660,11 +660,14 @@ static void intel_tc_port_update_mode(struct intel_digital_port *dig_port, 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--; } /** @@ -690,7 +693,7 @@ void intel_tc_port_init_mode(struct intel_digital_port *dig_port) 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); @@ -726,8 +729,6 @@ void intel_tc_port_sanitize_mode(struct intel_digital_port *dig_port) 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, @@ -746,6 +747,7 @@ void intel_tc_port_sanitize_mode(struct intel_digital_port *dig_port) 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)); @@ -864,14 +866,14 @@ void intel_tc_port_get_link(struct intel_digital_port *dig_port, 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); /* -- 2.7.4