Reduce SHPD_CNT to 250us for ICL and above as it lines up with DP1.4a(Table3-4) spec. --v2 -Update commit message and comment [Matt] --v3 -drop condition and use value of 250us for ICL and above [Matt] Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_hotplug_irq.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c index 2c4e946d5575..3a105cfd3c90 100644 --- a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c +++ b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c @@ -849,10 +849,11 @@ static void icp_hpd_irq_setup(struct drm_i915_private *dev_priv) enabled_irqs = intel_hpd_enabled_irqs(dev_priv, dev_priv->display.hotplug.pch_hpd); hotplug_irqs = intel_hpd_hotplug_irqs(dev_priv, dev_priv->display.hotplug.pch_hpd); - if (INTEL_PCH_TYPE(dev_priv) <= PCH_TGP) - intel_uncore_write(&dev_priv->uncore, SHPD_FILTER_CNT, SHPD_FILTER_CNT_500_ADJ); - else - intel_uncore_write(&dev_priv->uncore, SHPD_FILTER_CNT, SHPD_FILTER_CNT_250); + /* + * We reduce the value to 250us to be able to detect SHPD when an external display + * is connected. This is also expected of us as stated in DP1.4a Table 3-4. + */ + intel_uncore_write(&dev_priv->uncore, SHPD_FILTER_CNT, SHPD_FILTER_CNT_250); ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs); -- 2.43.2
