Add the reason for having SHPD_FILTER_CNT value for XE_LPD+ and above as 250us instead of 500us. --v2 -Update commit message [Matt] Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx> Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_hotplug_irq.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c index 8427386132e6..f28f35121e5a 100644 --- a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c +++ b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c @@ -1064,6 +1064,10 @@ static void mtp_hpd_irq_setup(struct drm_i915_private *i915) enabled_irqs = intel_hpd_enabled_irqs(i915, i915->display.hotplug.pch_hpd); hotplug_irqs = intel_hpd_hotplug_irqs(i915, i915->display.hotplug.pch_hpd); + /* + * Use 250us here to align with the DP1.4a(Table 3-4) spec as to what the + * SHPD_FILTER_CNT value should be. + */ intel_de_write(i915, SHPD_FILTER_CNT, SHPD_FILTER_CNT_250); mtp_hpd_invert(i915); -- 2.43.2
