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drm/i915/tc: Wait for IOM/FW PHY initialization of legacy TC ports

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During boot-up/system resume, the TC PHY on legacy ports will be
initialized by the IOM/TCSS firmware regardless of a sink being
connected or not (as opposed to DP-alt/TBT ports, which the FW only
inits once a sink is connected).

Wait for the above initialization to complete during HW readout, so that
connecting the PHY later will already see the expected PHY ready state.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230316131724.359612-6-imre.deak@intel.com
This commit is contained in:
Imre Deak 2023-03-16 15:17:15 +02:00
parent 06f66261a1
commit b25f551ae1
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/i915/display/intel_tc.c
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@ -582,6 +582,15 @@ static bool icl_tc_phy_is_connected(struct intel_digital_port *dig_port)
dig_port->tc_mode == TC_PORT_LEGACY;
}
static void tc_phy_wait_for_ready(struct intel_digital_port *dig_port)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
if (wait_for(tc_phy_status_complete(dig_port), 100))
drm_err(&i915->drm, "Port %s: timeout waiting for PHY ready\n",
dig_port->tc_port_name);
}
static enum tc_port_mode
intel_tc_port_get_current_mode(struct intel_digital_port *dig_port)
{
@ -589,6 +598,14 @@ intel_tc_port_get_current_mode(struct intel_digital_port *dig_port)
u32 live_status_mask = tc_port_live_status_mask(dig_port);
enum tc_port_mode mode;
/*
* For legacy ports the IOM firmware initializes the PHY during boot-up
* and system resume whether or not a sink is connected. Wait here for
* the initialization to get ready.
*/
if (dig_port->tc_legacy_port)
tc_phy_wait_for_ready(dig_port);
if (!tc_phy_is_owned(dig_port) ||
drm_WARN_ON(&i915->drm, !tc_phy_status_complete(dig_port)))
return TC_PORT_TBT_ALT;