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drm/i915/dp_mst: Verify the link status always the same way

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The MST link status should be always verified from the same DPCD
registers after link training. Atm, both the legacy (0x202 - 0x205) and
the ESI (0x200C - 0x200F) link status registers are used. Use always the
latter ESI version of link status registers.

v2: Propagate error from intel_dp_read_link_status(). (Jani, Luca)

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260225164618.1261368-3-imre.deak@intel.com
This commit is contained in:
Imre Deak 2026-02-25 18:46:00 +02:00
parent c51348f02b
commit 1ed0420217
1 changed files with 18 additions and 2 deletions
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20
drivers/gpu/drm/i915/display/intel_dp.c
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@ -5568,6 +5568,23 @@ intel_dp_handle_hdmi_link_status_change(struct intel_dp *intel_dp)
}
}
static int
intel_dp_read_link_status(struct intel_dp *intel_dp, u8 link_status[DP_LINK_STATUS_SIZE])
{
int err;
memset(link_status, 0, DP_LINK_STATUS_SIZE);
if (intel_dp_mst_active_streams(intel_dp) > 0)
err = drm_dp_dpcd_read_data(&intel_dp->aux, DP_LANE0_1_STATUS_ESI,
link_status, DP_LINK_STATUS_SIZE - 2);
else
err = drm_dp_dpcd_read_phy_link_status(&intel_dp->aux, DP_PHY_DPRX,
link_status);
return err;
}
static bool
intel_dp_needs_link_retrain(struct intel_dp *intel_dp)
{
@ -5590,8 +5607,7 @@ intel_dp_needs_link_retrain(struct intel_dp *intel_dp)
if (intel_dp->link.force_retrain)
return true;
if (drm_dp_dpcd_read_phy_link_status(&intel_dp->aux, DP_PHY_DPRX,
link_status) < 0)
if (intel_dp_read_link_status(intel_dp, link_status) < 0)
return false;
/*