Re: [PATCH] drm/i915/bxt: WA for swapped HPD pins in A stepping

["Jindal, Sonika" <sonika.jindal@intel.com>]

On 7/22/2015 4:03 PM, Sivakumar Thulasimani wrote:
>
>
> On 7/22/2015 3:37 PM, Sonika Jindal wrote:
>> As per bspec, on BXT A0/A1, sw needs to activate DDIA HPD logic
>> and interrupts to check the external panel connection and DDIC HPD
>> logic for edp panel.
>>
>> v2: For DP, irq_port is used to determine the encoder instead of
>> hpd_pin and removing the edp HPD logic because port A HPD is not
>> present(Imre)
>> v3: Rebased on top of Imre's patchset for enabling HPD on PORT A.
>> Added hpd_pin swapping for intel_dp_init_connector, setting encoder
>> for PORT_A as per the WA in irq_port (Imre)
>>
>> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
>> ---
>>   drivers/gpu/drm/i915/intel_ddi.c  |   12 +++++++++++-
>>   drivers/gpu/drm/i915/intel_dp.c   |    4 ++++
>>   drivers/gpu/drm/i915/intel_hdmi.c |    9 ++++++++-
>>   3 files changed, 23 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_ddi.c
>> b/drivers/gpu/drm/i915/intel_ddi.c
>> index e2c6f73..d5745e2 100644
>> --- a/drivers/gpu/drm/i915/intel_ddi.c
>> +++ b/drivers/gpu/drm/i915/intel_ddi.c
>> @@ -3225,7 +3225,17 @@ void intel_ddi_init(struct drm_device *dev,
>> enum port port)
>>               goto err;
>>           intel_dig_port->hpd_pulse = intel_dp_hpd_pulse;
>> -        dev_priv->hotplug.irq_port[port] = intel_dig_port;
>> +        /*
>> +         * On BXT A0/A1, sw needs to activate DDIA HPD logic and
>> +         * interrupts to check the external panel connection.
>> +         */
>> +        if (IS_BROXTON(dev_priv) && (INTEL_REVID(dev) < BXT_REVID_B0)) {
>> +            if (port == PORT_B)
>> +                dev_priv->hotplug.irq_port[PORT_A] = intel_dig_port;
>> +            else if (port == PORT_A)
>> +                dev_priv->hotplug.irq_port[PORT_C] = intel_dig_port;
>> +        } else
>> +            dev_priv->hotplug.irq_port[port] = intel_dig_port;
>>       }
>>       /* In theory we don't need the encoder->type check, but leave it
>> just in
>> diff --git a/drivers/gpu/drm/i915/intel_dp.c
>> b/drivers/gpu/drm/i915/intel_dp.c
>> index fcc64e5..71679ef 100644
>> --- a/drivers/gpu/drm/i915/intel_dp.c
>> +++ b/drivers/gpu/drm/i915/intel_dp.c
>> @@ -5785,9 +5785,13 @@ intel_dp_init_connector(struct
>> intel_digital_port *intel_dig_port,
>>       switch (port) {
>>       case PORT_A:
>>           intel_encoder->hpd_pin = HPD_PORT_A;
>> +        if (IS_BROXTON(dev_priv) && (INTEL_REVID(dev) < BXT_REVID_B0))
>> +            intel_encoder->hpd_pin = HPD_PORT_C;
>>           break;
>>       case PORT_B:
>>           intel_encoder->hpd_pin = HPD_PORT_B;
>> +        if (IS_BROXTON(dev_priv) && (INTEL_REVID(dev) < BXT_REVID_B0))
>> +            intel_encoder->hpd_pin = HPD_PORT_A;
>>           break;
>>       case PORT_C:
>>           intel_encoder->hpd_pin = HPD_PORT_C;
>> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
>> b/drivers/gpu/drm/i915/intel_hdmi.c
>> index 70bad5b..94fa716 100644
>> --- a/drivers/gpu/drm/i915/intel_hdmi.c
>> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
>> @@ -1973,7 +1973,14 @@ void intel_hdmi_init_connector(struct
>> intel_digital_port *intel_dig_port,
>>               intel_hdmi->ddc_bus = GMBUS_PIN_1_BXT;
>>           else
>>               intel_hdmi->ddc_bus = GMBUS_PIN_DPB;
>> -        intel_encoder->hpd_pin = HPD_PORT_B;
>> +        /*
>> +         * On BXT A0/A1, sw needs to activate DDIA HPD logic and
>> +         * interrupts to check the external panel connection.
>> +         */
>> +        if (IS_BROXTON(dev_priv) && (INTEL_REVID(dev) < BXT_REVID_B0))
>> +            intel_encoder->hpd_pin = HPD_PORT_A;
>> +        else
>> +            intel_encoder->hpd_pin = HPD_PORT_B;
>>           break;
>>       case PORT_C:
>>           if (IS_BROXTON(dev_priv))
> bxt_hpd_irq_setup is not touched here without this being updated i dont
> think HPD can be enabled.
Now, we swap the hpd_pin, which is being used to enable HPD in 
bxt_hpd_irq_setup.

Regards,
Sonika
>
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