On Thu, 2020-05-14 at 23:45 +0300, Imre Deak wrote:
> Make sure to select the port's AUX power domain while holding the TC
> port lock. The domain depends on the port's current TC mode, which may
> get changed under us if we're not holding the lock.
>
> This was left out from
> commit 8c10e2262663 ("drm/i915: Keep the TypeC port mode fixed for detect/AUX transfers")
>
Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v5.4+
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_dp.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 408c3c1c5e81..40d42dcff0b7 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -1359,8 +1359,7 @@ intel_dp_aux_xfer(struct intel_dp *intel_dp,
> bool is_tc_port = intel_phy_is_tc(i915, phy);
> i915_reg_t ch_ctl, ch_data[5];
> u32 aux_clock_divider;
> - enum intel_display_power_domain aux_domain =
> - intel_aux_power_domain(intel_dig_port);
> + enum intel_display_power_domain aux_domain;
> intel_wakeref_t aux_wakeref;
> intel_wakeref_t pps_wakeref;
> int i, ret, recv_bytes;
> @@ -1375,6 +1374,8 @@ intel_dp_aux_xfer(struct intel_dp *intel_dp,
> if (is_tc_port)
> intel_tc_port_lock(intel_dig_port);
>
> + aux_domain = intel_aux_power_domain(intel_dig_port);
> +
> aux_wakeref = intel_display_power_get(i915, aux_domain);
> pps_wakeref = pps_lock(intel_dp);
>
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