[Intel-gfx] [PATCH 2/2] drm/i915/icl: implement icl_digital_port_connected()

[Lucas De Marchi]

On Wed, Jun 20, 2018 at 02:36:05PM -0700, Anusha Srivatsa wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> Do like the other functions and check for the ISR bits. We have plans
> to add a few more checks in this code in the next patches, that's why
> it's a little more verbose than it could be.
> 
> v2:
> - Change the register names, to be consistent with
> the rest of the platforms.
> 
> Cc: Animesh Manna <animesh.manna at intel.com>
> Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

My review stands for v2 as done in v1:

Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>

Lucas De Marchi

> ---
>  drivers/gpu/drm/i915/i915_reg.h |  5 ++++
>  drivers/gpu/drm/i915/intel_dp.c | 57 +++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 62 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index e347055..f55e889 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7093,6 +7093,7 @@ enum {
>  #define  GEN11_TC3_HOTPLUG			(1 << 18)
>  #define  GEN11_TC2_HOTPLUG			(1 << 17)
>  #define  GEN11_TC1_HOTPLUG			(1 << 16)
> +#define  GEN11_TC_HOTPLUG(tc_port)		(1 << ((tc_port) + 16))
>  #define  GEN11_DE_TC_HOTPLUG_MASK		(GEN11_TC4_HOTPLUG | \
>  						 GEN11_TC3_HOTPLUG | \
>  						 GEN11_TC2_HOTPLUG | \
> @@ -7101,6 +7102,7 @@ enum {
>  #define  GEN11_TBT3_HOTPLUG			(1 << 2)
>  #define  GEN11_TBT2_HOTPLUG			(1 << 1)
>  #define  GEN11_TBT1_HOTPLUG			(1 << 0)
> +#define  GEN11_TBT_HOTPLUG(tc_port)		(1 << (tc_port))
>  #define  GEN11_DE_TBT_HOTPLUG_MASK		(GEN11_TBT4_HOTPLUG | \
>  						 GEN11_TBT3_HOTPLUG | \
>  						 GEN11_TBT2_HOTPLUG | \
> @@ -7525,6 +7527,9 @@ enum {
>  #define   SDE_GMBUS_ICP			(1 << 23)
>  #define   SDE_DDIB_HOTPLUG_ICP		(1 << 17)
>  #define   SDE_DDIA_HOTPLUG_ICP		(1 << 16)
> +#define SDE_TC_HOTPLUG_ICP(tc_port)		(1 << ((tc_port) + 24))
> +#define SDE_DDI_HOTPLUG_ICP(port)		(1 << ((port) + 16))
> +
>  
>  #define SDE_DDI_MASK_ICP		(SDE_DDIB_HOTPLUG_ICP |	\
>  					 SDE_DDIA_HOTPLUG_ICP)
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 6ac6c87..224cc71 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4750,6 +4750,61 @@ static bool bxt_digital_port_connected(struct intel_encoder *encoder)
>  	return I915_READ(GEN8_DE_PORT_ISR) & bit;
>  }
>  
> +static bool icl_combo_port_connected(struct drm_i915_private *dev_priv,
> +				     struct intel_digital_port *intel_dig_port)
> +{
> +	enum port port = intel_dig_port->base.port;
> +
> +	return I915_READ(SDEISR) & SDE_DDI_HOTPLUG_ICP(port);
> +}
> +
> +static bool icl_tc_port_connected(struct drm_i915_private *dev_priv,
> +				  struct intel_digital_port *intel_dig_port)
> +{
> +	enum port port = intel_dig_port->base.port;
> +	enum tc_port tc_port = intel_port_to_tc(dev_priv, port);
> +	u32 legacy_bit = SDE_TC_HOTPLUG_ICP(tc_port);
> +	u32 typec_bit = GEN11_TC_HOTPLUG(tc_port);
> +	u32 tbt_bit = GEN11_TBT_HOTPLUG(tc_port);
> +	bool is_legacy = false, is_typec = false, is_tbt = false;
> +	u32 cpu_isr;
> +
> +	if (I915_READ(SDEISR) & legacy_bit)
> +		is_legacy = true;
> +
> +	cpu_isr = I915_READ(GEN11_DE_HPD_ISR);
> +	if (cpu_isr & typec_bit)
> +		is_typec = true;
> +	if (cpu_isr & tbt_bit)
> +		is_tbt = true;
> +
> +	WARN_ON(is_legacy + is_typec + is_tbt > 1);
> +	if (!is_legacy && !is_typec && !is_tbt)
> +		return false;
> +
> +	return true;
> +}
> +
> +static bool icl_digital_port_connected(struct intel_encoder *encoder)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
> +
> +	switch (encoder->hpd_pin) {
> +	case HPD_PORT_A:
> +	case HPD_PORT_B:
> +		return icl_combo_port_connected(dev_priv, dig_port);
> +	case HPD_PORT_C:
> +	case HPD_PORT_D:
> +	case HPD_PORT_E:
> +	case HPD_PORT_F:
> +		return icl_tc_port_connected(dev_priv, dig_port);
> +	default:
> +		MISSING_CASE(encoder->hpd_pin);
> +		return false;
> +	}
> +}
> +
>  /*
>   * intel_digital_port_connected - is the specified port connected?
>   * @encoder: intel_encoder
> @@ -4777,6 +4832,8 @@ bool intel_digital_port_connected(struct intel_encoder *encoder)
>  		return bdw_digital_port_connected(encoder);
>  	else if (IS_GEN9_LP(dev_priv))
>  		return bxt_digital_port_connected(encoder);
> +	else if (IS_ICELAKE(dev_priv))
> +		return icl_digital_port_connected(encoder);
>  	else
>  		return spt_digital_port_connected(encoder);
>  }
> -- 
> 2.7.4
> 
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