Re: [PATCH 19/24] drm/i915/icl: store the port type for TC ports

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Mon, May 21, 2018 at 05:25:53PM -0700, Paulo Zanoni wrote:
> The type is detected based on the interrupt ISR bit. Once detected,
> it's not supposed to be changed, so we have some sanity checks for
> that.
> 
> Cc: Animesh Manna <animesh.manna@intel.com>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.h |  7 +++++++
>  drivers/gpu/drm/i915/intel_dp.c      | 36 +++++++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/intel_drv.h     |  1 +
>  3 files changed, 43 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> index c88185ed7594..fcedc600706b 100644
> --- a/drivers/gpu/drm/i915/intel_display.h
> +++ b/drivers/gpu/drm/i915/intel_display.h
> @@ -137,6 +137,13 @@ enum tc_port {
>  	I915_MAX_TC_PORTS
>  };
>  
> +enum tc_port_type {
> +	TC_PORT_UNKNOWN = 0,
> +	TC_PORT_TYPEC,
> +	TC_PORT_TBT,
> +	TC_PORT_LEGACY,
> +};
> +
>  enum dpio_channel {
>  	DPIO_CH0,
>  	DPIO_CH1
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index b477124717e7..f3d5b9eed625 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4730,6 +4730,38 @@ static bool icl_combo_port_connected(struct drm_i915_private *dev_priv,
>  	return I915_READ(ICP_SDE_ISR) & ICP_DDI_HOTPLUG(port);
>  }
>  
> +static void icl_update_tc_port_type(struct drm_i915_private *dev_priv,
> +				    struct intel_digital_port *intel_dig_port,
> +				    bool is_legacy, bool is_typec, bool is_tbt)
> +{
> +	enum port port = intel_dig_port->base.port;
> +	enum tc_port_type old_type = intel_dig_port->tc_type;
> +	const char *type_str;
> +
> +	WARN_ON(is_legacy + is_typec + is_tbt != 1);
> +
> +	if (is_legacy) {
> +		intel_dig_port->tc_type = TC_PORT_LEGACY;
> +		type_str = "legacy";
> +	} else if (is_typec) {
> +		intel_dig_port->tc_type = TC_PORT_TYPEC;
> +		type_str = "typec";
> +	} else if (is_tbt) {
> +		intel_dig_port->tc_type = TC_PORT_TBT;
> +		type_str = "tbt";
> +	} else {
> +		return;
> +	}
> +
> +	/* Types are not supposed to be changed at runtime. */
> +	WARN_ON(old_type != TC_PORT_UNKNOWN &&
> +		old_type != intel_dig_port->tc_type);
> +
> +	if (old_type != intel_dig_port->tc_type)
> +		DRM_DEBUG_KMS("Port %c has TC type %s\n", port_name(port),
> +			      type_str);
> +}
> +
>  static bool icl_tc_port_connected(struct drm_i915_private *dev_priv,
>  				  struct intel_digital_port *intel_dig_port)
>  {
> @@ -4750,10 +4782,12 @@ static bool icl_tc_port_connected(struct drm_i915_private *dev_priv,
>  	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;
>  
> +	icl_update_tc_port_type(dev_priv, intel_dig_port, is_legacy, is_typec,
> +				is_tbt);

I really don't like the new chain of functions this patch here starts.

for all other platforms the function is_port_connect returns true or false
immediately. For this TC/TBT design this start a new chain that not only
check if it is connected but it also updates the status... and all in a
chain of function calls....

I didn't check the code now actually. I just remember for one rebase
change that I did a while ago and saw these patches. Unfortunately I
had no better idea on when exactly call the current status when I looked.

Probably a totally separated function that is called outside right always
along with is_port_connected

update_tc_port()
is_port_connected()

just to keep is_port_connect as simple as it is on any other platform
and this new meaning of status update in a separated block.

Thanks,
Rodrigo.

> +
>  	return true;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index a54232c270e1..8602f2e17d86 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1169,6 +1169,7 @@ struct intel_digital_port {
>  	bool release_cl2_override;
>  	uint8_t max_lanes;
>  	enum intel_display_power_domain ddi_io_power_domain;
> +	enum tc_port_type tc_type;
>  
>  	void (*write_infoframe)(struct drm_encoder *encoder,
>  				const struct intel_crtc_state *crtc_state,
> -- 
> 2.14.3
> 
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