Re: [PATCH 3/8] drm/i915/icl: store the port type for TC ports

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

On Wed, Jul 11, 2018 at 02:59:04PM -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 ca5a10f3400d..18ed9835335c 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 f2197dea02d0..486b879cdef7 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4752,6 +4752,38 @@ static bool icl_combo_port_connected(struct drm_i915_private *dev_priv,
>  	return I915_READ(SDEISR) & SDE_DDI_HOTPLUG_ICP(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)
>  {
> @@ -4772,10 +4804,12 @@ 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);

oh, I know see that I got it wrong on my previous suggestion, but since
we are removing maybe it is better to not add at all at first place?!

>  	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);

for a while I thougth this was the start of the chain that I didn't like,
but I was wrong, the type I believe it can/need to be here indeed.

but for everything else I believe that you need to handle on long_pulse.

if it is connected and tc_type != known than you do all the rest
of the opperation instead of making a huge chain from this point.

(for the lspcon wa path I don't believe we need that at all, but if we
need we should also handle there)

For this patch:

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

> +
>  	return true;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 61e715ddd0d5..8b3c3dc76810 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1162,6 +1162,7 @@ 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,
> -- 
> 2.14.4
> 
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