[Intel-gfx] [PATCH 12/13] drm/i915/mtl: Pin assignment for TypeC

[Matt Atwood]

On Thu, Apr 20, 2023 at 03:40:49PM +0300, Mika Kahola wrote:
> From: Anusha Srivatsa <anusha.srivatsa at intel.com>
> 
> Unlike previous platforms that used PORT_TX_DFLEXDPSP
> for max_lane calculation, MTL uses only PORT_TX_DFLEXPA1
> from which the max_lanes has to be calculated.
> 
> Bspec: 50235, 65380
> 
Reviewed-by: Matt Atwood <matthew.s.atwood at intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
> Signed-off-by: Jose Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Mika Kahola <mika.kahola at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_tc.c | 28 +++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
> index b192265a3d78..4fca711a58bc 100644
> --- a/drivers/gpu/drm/i915/display/intel_tc.c
> +++ b/drivers/gpu/drm/i915/display/intel_tc.c
> @@ -16,6 +16,10 @@
>  #include "intel_mg_phy_regs.h"
>  #include "intel_tc.h"
>  
> +#define DP_PIN_ASSIGNMENT_C	0x3
> +#define DP_PIN_ASSIGNMENT_D	0x4
> +#define DP_PIN_ASSIGNMENT_E	0x5
> +
>  enum tc_port_mode {
>  	TC_PORT_DISCONNECTED,
>  	TC_PORT_TBT_ALT,
> @@ -281,6 +285,27 @@ u32 intel_tc_port_get_pin_assignment_mask(struct intel_digital_port *dig_port)
>  	       DP_PIN_ASSIGNMENT_SHIFT(tc->phy_fia_idx);
>  }
>  
> +static int mtl_tc_port_get_pin_assignment_mask(struct intel_digital_port *dig_port)
> +{
> +	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
> +	intel_wakeref_t wakeref;
> +	u32 pin_mask;
> +
> +	with_intel_display_power(i915, POWER_DOMAIN_DISPLAY_CORE, wakeref)
> +		pin_mask = intel_tc_port_get_pin_assignment_mask(dig_port);
> +
> +	switch (pin_mask) {
> +	default:
> +		MISSING_CASE(pin_mask);
> +		fallthrough;
> +	case DP_PIN_ASSIGNMENT_D:
> +		return 2;
> +	case DP_PIN_ASSIGNMENT_C:
> +	case DP_PIN_ASSIGNMENT_E:
> +		return 4;
> +	}
> +}
> +
>  int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port)
>  {
>  	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
> @@ -294,6 +319,9 @@ int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port)
>  
>  	assert_tc_cold_blocked(tc);
>  
> +	if (DISPLAY_VER(i915) >= 14)
> +		return mtl_tc_port_get_pin_assignment_mask(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);
> -- 
> 2.34.1
>