[Intel-gfx] [PATCH 3/3] drm/i915: Check live status before reading edid

[Jindal, Sonika]

On 7/14/2015 7:59 PM, Imre Deak wrote:
> On ti, 2015-07-14 at 17:21 +0530, Sonika Jindal wrote:
>> Adding this for SKL onwards.
>>
>> v2: Adding checks for VLV/CHV as well. Reusing old ibx and g4x functions
>> to check digital port status. Adding a separate function to get bxt live
>> status (Daniel)
>>
>> Signed-off-by: Sonika Jindal <sonika.jindal at intel.com>
>> ---
>>   drivers/gpu/drm/i915/intel_dp.c   |    4 ++--
>>   drivers/gpu/drm/i915/intel_drv.h  |    2 ++
>>   drivers/gpu/drm/i915/intel_hdmi.c |   43 +++++++++++++++++++++++++++++++++----
>>   3 files changed, 43 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
>> index 4ebfc3a..7b54b9d 100644
>> --- a/drivers/gpu/drm/i915/intel_dp.c
>> +++ b/drivers/gpu/drm/i915/intel_dp.c
>> @@ -4443,8 +4443,8 @@ ironlake_dp_detect(struct intel_dp *intel_dp)
>>   	return intel_dp_detect_dpcd(intel_dp);
>>   }
>>
>> -static int g4x_digital_port_connected(struct drm_device *dev,
>> -				       struct intel_digital_port *intel_dig_port)
>> +int g4x_digital_port_connected(struct drm_device *dev,
>> +			       struct intel_digital_port *intel_dig_port)
>>   {
>>   	struct drm_i915_private *dev_priv = dev->dev_private;
>>   	uint32_t bit;
>> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>> index a47fbc3..30c8dd6 100644
>> --- a/drivers/gpu/drm/i915/intel_drv.h
>> +++ b/drivers/gpu/drm/i915/intel_drv.h
>> @@ -1187,6 +1187,8 @@ void intel_edp_drrs_disable(struct intel_dp *intel_dp);
>>   void intel_edp_drrs_invalidate(struct drm_device *dev,
>>   		unsigned frontbuffer_bits);
>>   void intel_edp_drrs_flush(struct drm_device *dev, unsigned frontbuffer_bits);
>> +int g4x_digital_port_connected(struct drm_device *dev,
>> +			       struct intel_digital_port *intel_dig_port);
>>
>>   /* intel_dp_mst.c */
>>   int intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_id);
>> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
>> index c4b82ce..402be54 100644
>> --- a/drivers/gpu/drm/i915/intel_hdmi.c
>> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
>> @@ -1300,6 +1300,40 @@ intel_hdmi_unset_edid(struct drm_connector *connector)
>>   	to_intel_connector(connector)->detect_edid = NULL;
>>   }
>>
>> +static bool bxt_port_connected(struct drm_i915_private *dev_priv,
>> +			       struct intel_digital_port *port)
>> +{
>> +	u32 temp = I915_READ(GEN8_DE_PORT_ISR);
>> +
>> +	/* TODO: Add bxt A0/A1 wa related to hpd pin swap */
>
> This doesn't seem to work on my BXT A1 RVP. For me GEN8_DE_PORT_ISR
> reads all 0 even while an HDMI monitor is plugged to port B.
>
This is really strange, I checked on atleast 3 different A1 boards and 3 
different monitors (also on two different branches) and I see 0x44440 as 
0x8 after the HPD swap patch when monitor is connected and it is 0 when 
no hdmi monitor is present.
Do you think something to do with the board config?

>> +	switch (port->port) {
>> +	case PORT_B:
>> +		return temp & BXT_DE_PORT_HP_DDIB;
>> +
>> +	case PORT_C:
>> +		return temp & BXT_DE_PORT_HP_DDIC;
>> +
>> +	default:
>> +		return false;
>> +
>> +	}
>> +}
>> +
>> +static bool intel_hdmi_live_status(struct intel_digital_port *intel_dig_port)
>> +{
>> +	struct drm_device *dev = intel_dig_port->base.base.dev;
>> +	struct drm_i915_private *dev_priv = to_i915(dev);
>> +
>> +	if (IS_VALLEYVIEW(dev))
>> +		return g4x_digital_port_connected(dev, intel_dig_port);
>> +	else if (IS_SKYLAKE(dev))
>> +		return ibx_digital_port_connected(dev_priv, intel_dig_port);
>> +	else if (IS_BROXTON(dev))
>> +		return bxt_port_connected(dev_priv, intel_dig_port);
>> +
>> +	return true;
>> +}
>> +
>>   static bool
>>   intel_hdmi_set_edid(struct drm_connector *connector)
>>   {
>> @@ -1308,15 +1342,16 @@ intel_hdmi_set_edid(struct drm_connector *connector)
>>   	struct intel_encoder *intel_encoder =
>>   		&hdmi_to_dig_port(intel_hdmi)->base;
>>   	enum intel_display_power_domain power_domain;
>> -	struct edid *edid;
>> +	struct edid *edid = NULL;
>>   	bool connected = false;
>>
>>   	power_domain = intel_display_port_power_domain(intel_encoder);
>>   	intel_display_power_get(dev_priv, power_domain);
>>
>> -	edid = drm_get_edid(connector,
>> -			    intel_gmbus_get_adapter(dev_priv,
>> -						    intel_hdmi->ddc_bus));
>> +	if (intel_hdmi_live_status(hdmi_to_dig_port(intel_hdmi)))
>> +		edid = drm_get_edid(connector,
>> +				intel_gmbus_get_adapter(dev_priv,
>> +					intel_hdmi->ddc_bus));
>>
>>   	intel_display_power_put(dev_priv, power_domain);
>>
>
>