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drm/i915: Disconnect PHYs left connected by BIOS on disabled ports

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BIOS may leave a TypeC PHY in a connected state even though the
corresponding port is disabled. This will prevent any hotplug events
from being signalled (after the monitor deasserts and then reasserts its
HPD) until the PHY is disconnected and so the driver will not detect a
connected sink. Rebooting with the PHY in the connected state also
results in a system hang.

Fix the above by disconnecting TypeC PHYs on disabled ports.

Before commit 64851a32c4 the PHY connected state was read out even
for disabled ports and later the PHY got disconnected as a side effect
of a tc_port_lock/unlock() sequence (during connector probing), hence
recovering the port's hotplug functionality.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5014
Fixes: 64851a32c4 ("drm/i915/tc: Add a mode for the TypeC PHY's disconnected state")
Cc: <stable@vger.kernel.org> # v5.16+
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220217152237.670220-1-imre.deak@intel.com
(cherry picked from commit ed0ccf349f)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Imre Deak 2022-02-17 17:22:37 +02:00 committed by Tvrtko Ursulin
parent 3f33364836
commit a40ee54e9a
1 changed files with 21 additions and 7 deletions
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28
drivers/gpu/drm/i915/display/intel_tc.c
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@ -691,6 +691,8 @@ void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
struct intel_encoder *encoder = &dig_port->base;
intel_wakeref_t tc_cold_wref;
enum intel_display_power_domain domain;
int active_links = 0;
mutex_lock(&dig_port->tc_lock);
@ -702,12 +704,11 @@ void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
drm_WARN_ON(&i915->drm, dig_port->tc_mode != TC_PORT_DISCONNECTED);
drm_WARN_ON(&i915->drm, dig_port->tc_lock_wakeref);
tc_cold_wref = tc_cold_block(dig_port, &domain);
dig_port->tc_mode = intel_tc_port_get_current_mode(dig_port);
if (active_links) {
enum intel_display_power_domain domain;
intel_wakeref_t tc_cold_wref = tc_cold_block(dig_port, &domain);
dig_port->tc_mode = intel_tc_port_get_current_mode(dig_port);
if (!icl_tc_phy_is_connected(dig_port))
drm_dbg_kms(&i915->drm,
"Port %s: PHY disconnected with %d active link(s)\n",
@ -716,10 +717,23 @@ void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
dig_port->tc_lock_wakeref = tc_cold_block(dig_port,
&dig_port->tc_lock_power_domain);
tc_cold_unblock(dig_port, domain, tc_cold_wref);
} else {
/*
* TBT-alt is the default mode in any case the PHY ownership is not
* held (regardless of the sink's connected live state), so
* we'll just switch to disconnected mode from it here without
* a note.
*/
if (dig_port->tc_mode != TC_PORT_TBT_ALT)
drm_dbg_kms(&i915->drm,
"Port %s: PHY left in %s mode on disabled port, disconnecting it\n",
dig_port->tc_port_name,
tc_port_mode_name(dig_port->tc_mode));
icl_tc_phy_disconnect(dig_port);
}
tc_cold_unblock(dig_port, domain, tc_cold_wref);
drm_dbg_kms(&i915->drm, "Port %s: sanitize mode (%s)\n",
dig_port->tc_port_name,
tc_port_mode_name(dig_port->tc_mode));