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

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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@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240923031007.1058072-4-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal 2024-09-23 08:40:08 +05:30
parent 093ecfd550
commit df3859a4aa
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/display/intel_hotplug_irq.c
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@ -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);