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drm/i915/mst: abstract handling of link status in DP MST

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We'll want to expand on this, so abstract it to a separate function
first. Improve debug logging while at it.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220112110319.1172110-4-jani.nikula@intel.com
This commit is contained in:
Jani Nikula
2022-01-12 13:03:16 +02:00
parent 34ed3e8347
commit 1358139bde
1 changed files with 18 additions and 5 deletions
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23
drivers/gpu/drm/i915/display/intel_dp.c
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@@ -3639,6 +3639,21 @@ intel_dp_mst_hpd_irq(struct intel_dp *intel_dp, u8 *esi, bool *handled)
}
}
static bool intel_dp_mst_link_status(struct intel_dp *intel_dp, u8 *esi)
{
struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
if (!drm_dp_channel_eq_ok(&esi[10], intel_dp->lane_count)) {
drm_dbg_kms(&i915->drm,
"[ENCODER:%d:%s] channel EQ not ok, retraining\n",
encoder->base.base.id, encoder->base.name);
return false;
}
return true;
}
/**
* intel_dp_check_mst_status - service any pending MST interrupts, check link status
* @intel_dp: Intel DP struct
@@ -3686,11 +3701,9 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp)
drm_dbg_kms(&i915->drm, "DPRX ESI: %4ph\n", esi);
/* check link status - esi[10] = 0x200c */
if (intel_dp->active_mst_links > 0 && link_ok &&
!drm_dp_channel_eq_ok(&esi[10], intel_dp->lane_count)) {
drm_dbg_kms(&i915->drm,
"channel EQ not ok, retraining\n");
link_ok = false;
if (intel_dp->active_mst_links > 0 && link_ok) {
if (!intel_dp_mst_link_status(intel_dp, esi))
link_ok = false;
}
intel_dp_mst_hpd_irq(intel_dp, esi, &handled);