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drm/tegra: sor: Avoid timeouts on unplug events 

When the SOR is disabled in DP mode as part of an unplug event, do not
attempt to power the DP link down. Powering down the link requires the
DPAUX to transmit AUX messages which only works if there's a connected
sink.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2019-07-25 15:41:36 +02:00
parent d278e4a971
commit 68a2ebb54d
1 changed files with 10 additions and 3 deletions
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13
drivers/gpu/drm/tegra/sor.c
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@ -2663,9 +2663,16 @@ static void tegra_sor_dp_disable(struct drm_encoder *encoder)
if (output->panel)
drm_panel_disable(output->panel);
err = drm_dp_link_power_down(sor->aux, &sor->link);
if (err < 0)
dev_err(sor->dev, "failed to power down link: %d\n", err);
/*
* Do not attempt to power down a DP link if we're not connected since
* the AUX transactions would just be timing out.
*/
if (output->connector.status != connector_status_disconnected) {
err = drm_dp_link_power_down(sor->aux, &sor->link);
if (err < 0)
dev_err(sor->dev, "failed to power down link: %d\n",
err);
}
err = tegra_sor_detach(sor);
if (err < 0)