[Intel-gfx] [PATCH 2/2] drm/i915/bxt: WA for swapped HPD pins in A stepping

[Daniel Vetter]

On Tue, Jul 14, 2015 at 11:18:50AM +0530, 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.
> 
> Signed-off-by: Sonika Jindal <sonika.jindal at intel.com>

Yeah I think this is much clearer. Will pull in as soon as there's an r-b
on these two.

Thanks, Daniel

> ---
>  drivers/gpu/drm/i915/intel_dp.c   |   18 ++++++++++++++++--
>  drivers/gpu/drm/i915/intel_hdmi.c |    9 ++++++++-
>  2 files changed, 24 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 7b54b9d..c32f3d3 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5869,10 +5869,24 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
>  	/* Set up the hotplug pin. */
>  	switch (port) {
>  	case PORT_A:
> -		intel_encoder->hpd_pin = HPD_PORT_A;
> +		/*
> +		 * On BXT A0/A1, sw needs to activate DDIC HPD logic and
> +		 * interrupts to check the eDP panel connection.
> +		 */
> +		if (IS_BROXTON(dev_priv) && (INTEL_REVID(dev) < BXT_REVID_B0))
> +			intel_encoder->hpd_pin = HPD_PORT_C;
> +		else
> +			intel_encoder->hpd_pin = HPD_PORT_A;
>  		break;
>  	case PORT_B:
> -		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:
>  		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 44e7160..121e626 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -2011,7 +2011,14 @@ 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))
> -- 
> 1.7.10.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch