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drm/i915/tc: Catch TC users accessing FIA registers without enable aux

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As described in "drm/i915/tc/icl: Implement TC cold sequences" users
of TC functions should held aux power well during access to avoid
read garbage due HW in TC cold state.

v3:
- renamed is_tc_cold_blocked() to assert_tc_cold_blocked()
- restored the removed 0xffffffff checks

Reviewed-by: Imre Deak <imre.deak@intel.com>
Tested-by: You-Sheng Yang <vicamo.yang@canonical.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200414194956.164323-7-jose.souza@intel.com
This commit is contained in:
José Roberto de Souza 2020-04-14 12:49:55 -07:00
parent 3c02934b24
commit 3ed347d1a7
1 changed files with 20 additions and 0 deletions
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20
drivers/gpu/drm/i915/display/intel_tc.c
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@ -95,6 +95,20 @@ tc_cold_unblock(struct intel_digital_port *dig_port, intel_wakeref_t wakeref)
intel_display_power_put_async(i915, domain, wakeref);
}
static void
assert_tc_cold_blocked(struct intel_digital_port *dig_port)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
bool enabled;
if (INTEL_GEN(i915) == 11 && !dig_port->tc_legacy_port)
return;
enabled = intel_display_power_is_enabled(i915,
tc_cold_get_power_domain(dig_port));
drm_WARN_ON(&i915->drm, !enabled);
}
u32 intel_tc_port_get_lane_mask(struct intel_digital_port *dig_port)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
@ -105,6 +119,7 @@ u32 intel_tc_port_get_lane_mask(struct intel_digital_port *dig_port)
PORT_TX_DFLEXDPSP(dig_port->tc_phy_fia));
drm_WARN_ON(&i915->drm, lane_mask == 0xffffffff);
assert_tc_cold_blocked(dig_port);
lane_mask &= DP_LANE_ASSIGNMENT_MASK(dig_port->tc_phy_fia_idx);
return lane_mask >> DP_LANE_ASSIGNMENT_SHIFT(dig_port->tc_phy_fia_idx);
@ -120,6 +135,7 @@ u32 intel_tc_port_get_pin_assignment_mask(struct intel_digital_port *dig_port)
PORT_TX_DFLEXPA1(dig_port->tc_phy_fia));
drm_WARN_ON(&i915->drm, pin_mask == 0xffffffff);
assert_tc_cold_blocked(dig_port);
return (pin_mask & DP_PIN_ASSIGNMENT_MASK(dig_port->tc_phy_fia_idx)) >>
DP_PIN_ASSIGNMENT_SHIFT(dig_port->tc_phy_fia_idx);
@ -134,6 +150,8 @@ int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port)
if (dig_port->tc_mode != TC_PORT_DP_ALT)
return 4;
assert_tc_cold_blocked(dig_port);
lane_mask = 0;
with_intel_display_power(i915, POWER_DOMAIN_DISPLAY_CORE, wakeref)
lane_mask = intel_tc_port_get_lane_mask(dig_port);
@ -166,6 +184,8 @@ void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port,
drm_WARN_ON(&i915->drm,
lane_reversal && dig_port->tc_mode != TC_PORT_LEGACY);
assert_tc_cold_blocked(dig_port);
val = intel_uncore_read(uncore,
PORT_TX_DFLEXDPMLE1(dig_port->tc_phy_fia));
val &= ~DFLEXDPMLE1_DPMLETC_MASK(dig_port->tc_phy_fia_idx);