[Intel-gfx] [PATCH] drm/i915/adlp: Fix TypeC PHY-ready status readout

[Souza, Jose]

On Wed, 2022-01-26 at 12:43 +0200, Imre Deak wrote:
> The TCSS_DDI_STATUS register is indexed by tc_port not by the FIA port
> index, fix this up. This only caused an issue on TC#3/4 ports in legacy
> mode, as in all other cases the two indices either match (on TC#1/2) or
> the TCSS_DDI_STATUS_READY flag is set regardless of something being
> connected or not (on TC#1/2/3/4 in dp-alt and tbt-alt modes).
> 

Reviewed-by: José Roberto de Souza <jose.souza at intel.com>

> Reported-and-tested-by: Chia-Lin Kao (AceLan) <acelan.kao at canonical.com>
> Fixes: 55ce306c2aa1 ("drm/i915/adl_p: Implement TC sequences")
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/4698
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Cc: <stable at vger.kernel.org> # v5.14+
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_tc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
> index 4eefe7b0bb263..3291124a99e5a 100644
> --- a/drivers/gpu/drm/i915/display/intel_tc.c
> +++ b/drivers/gpu/drm/i915/display/intel_tc.c
> @@ -346,10 +346,11 @@ static bool icl_tc_phy_status_complete(struct intel_digital_port *dig_port)
>  static bool adl_tc_phy_status_complete(struct intel_digital_port *dig_port)
>  {
>  	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
> +	enum tc_port tc_port = intel_port_to_tc(i915, dig_port->base.port);
>  	struct intel_uncore *uncore = &i915->uncore;
>  	u32 val;
>  
> -	val = intel_uncore_read(uncore, TCSS_DDI_STATUS(dig_port->tc_phy_fia_idx));
> +	val = intel_uncore_read(uncore, TCSS_DDI_STATUS(tc_port));
>  	if (val == 0xffffffff) {
>  		drm_dbg_kms(&i915->drm,
>  			    "Port %s: PHY in TCCOLD, assuming not complete\n",