On HP 800 G4 DM, if HDMI cable isn't plugged before boot, the HDMI port becomes useless and never responds to cable hotplugging: [ 3.031904] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon [ 3.031945] [drm:intel_ddi_init [i915]] *ERROR* LSPCON init failed on port D Seems like the lspcon chip on the system in question only gets powered after the cable is plugged. So let's call lspcon_init() dynamically to properly initialize the lspcon chip and make HDMI port work. Closes: https://gitlab.freedesktop.org/drm/intel/issues/203 Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> --- v3: - Make sure it's handled under long HPD case. v2: - Move lspcon_init() inside of intel_dp_hpd_pulse(). drivers/gpu/drm/i915/display/intel_dp.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index fe31bbfd6c62..a72c9c041c60 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -6573,6 +6573,7 @@ enum irqreturn intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd) { struct intel_dp *intel_dp = &intel_dig_port->dp; + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp); if (long_hpd && intel_dig_port->base.type == INTEL_OUTPUT_EDP) { /* @@ -6593,7 +6594,12 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd) long_hpd ? "long" : "short"); if (long_hpd) { - intel_dp->reset_link_params = true; + if (intel_dig_port->base.type == INTEL_OUTPUT_DDI && + HAS_LSPCON(dev_priv) && !intel_dig_port->lspcon.active) + lspcon_init(intel_dig_port); + else + intel_dp->reset_link_params = true; + return IRQ_NONE; } -- 2.17.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
