Commit df3859a4 authored by Suraj Kandpal's avatar Suraj Kandpal
Browse files

drm/i915/hotplug: Add comment for XE_LPD+ SHPD_FILTER_CNT value 



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: default avatarSuraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: default avatarMatt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240923031007.1058072-4-suraj.kandpal@intel.com
parent 093ecfd5

drivers/gpu/drm/i915/display/intel_hotplug_irq.c

+4 −0
Original line number Diff line number Diff line
@@ -1061,6 +1061,10 @@ 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);