From: Suraj Kandpal Date: Mon, 23 Sep 2024 03:10:08 +0000 (+0530) Subject: drm/i915/hotplug: Add comment for XE_LPD+ SHPD_FILTER_CNT value X-Git-Tag: v6.13-rc1~122^2~19^2~74 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=df3859a4aaa40783c50f43a6a8a53c7770d59ef1;p=thirdparty%2Fkernel%2Flinux.git 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: Suraj Kandpal Reviewed-by: Matt Roper Link: https://patchwork.freedesktop.org/patch/msgid/20240923031007.1058072-4-suraj.kandpal@intel.com --- diff --git a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c index 3a105cfd3c903..5d055dc9366f3 100644 --- a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c +++ b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c @@ -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);