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 Signed-off-by: Imre Deak imre.deak@intel.com --- drivers/gpu/drm/i915/display/intel_tc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c index ea93893980e17..14042a64375e1 100644 --- a/drivers/gpu/drm/i915/display/intel_tc.c +++ b/drivers/gpu/drm/i915/display/intel_tc.c @@ -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) { + 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,
-----Original Message----- From: Intel-xe intel-xe-bounces@lists.freedesktop.org On Behalf Of Imre Deak Sent: Tuesday, 5 August 2025 10.37 To: intel-gfx@lists.freedesktop.org; intel-xe@lists.freedesktop.org Cc: stable@vger.kernel.org; Lin, Charlton charlton.lin@intel.com; Almahallawy, Khaled khaled.almahallawy@intel.com Subject: [PATCH 04/19] drm/i915/lnl+/tc: Use the cached max lane count value
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
drivers/gpu/drm/i915/display/intel_tc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c index ea93893980e17..14042a64375e1 100644 --- a/drivers/gpu/drm/i915/display/intel_tc.c +++ b/drivers/gpu/drm/i915/display/intel_tc.c @@ -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) {
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,
2.49.1
linux-stable-mirror@lists.linaro.org
-
Imre Deak -
Kahola, Mika