Re: [PATCH 2/3] drm/i915: don't use HPD_PORT_A as an alias for HPD_NONE

[Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>]

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On 7/21/2015 3:13 AM, Imre Deak wrote:
> Currently HPD_PORT_A is used as an alias for HPD_NONE to mean that the
> given port doesn't support long/short HPD pulse detection. SDVO and CRT
> ports are like this and for these ports we only want to know whether an
> hot plug event was detected on the corresponding pin. Since at least on
> BXT we need long/short pulse detection on PORT A as well (added by the
> next patch) remove this aliasing of HPD_PORT_A/HPD_NONE and let the
> return value of intel_hpd_pin_to_port() show whether long/short pulse
> detection is supported on the passed in pin.
>
> No functional change.
>
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> ---
>   drivers/gpu/drm/i915/i915_drv.h      |  4 ++--
>   drivers/gpu/drm/i915/i915_irq.c      |  4 ++--
>   drivers/gpu/drm/i915/intel_hotplug.c | 20 +++++++++++++-------
>   3 files changed, 17 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 78d6c7a..ebfd5a5 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -206,11 +206,11 @@ enum intel_display_power_domain {
>   
>   enum hpd_pin {
>   	HPD_NONE = 0,
> -	HPD_PORT_A = HPD_NONE, /* PORT_A is internal */
>   	HPD_TV = HPD_NONE,     /* TV is known to be unreliable */
>   	HPD_CRT,
>   	HPD_SDVO_B,
>   	HPD_SDVO_C,
> +	HPD_PORT_A,
>   	HPD_PORT_B,
>   	HPD_PORT_C,
>   	HPD_PORT_D,
> @@ -2627,7 +2627,7 @@ void intel_hpd_irq_handler(struct drm_device *dev, u32 pin_mask, u32 long_mask);
>   void intel_hpd_init(struct drm_i915_private *dev_priv);
>   void intel_hpd_init_work(struct drm_i915_private *dev_priv);
>   void intel_hpd_cancel_work(struct drm_i915_private *dev_priv);
> -enum port intel_hpd_pin_to_port(enum hpd_pin pin);
> +bool intel_hpd_pin_to_port(enum hpd_pin pin, enum port *port);
>   
>   /* i915_irq.c */
>   void i915_queue_hangcheck(struct drm_device *dev);
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 306de78..4ad7a31 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1276,8 +1276,8 @@ static void intel_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
>   
>   		*pin_mask |= BIT(i);
>   
> -		port = intel_hpd_pin_to_port(i);
> -		if (long_pulse_detect(port, dig_hotplug_reg))
> +		if (intel_hpd_pin_to_port(i, &port) &&
> +		    long_pulse_detect(port, dig_hotplug_reg))
>   			*long_mask |= BIT(i);
>   	}
feel that this could be more readable when split it to two conditions ?
if (intel_hpd_pin_to_port(i, &port) == false)
     continue;
if (long_pulse_detect(port, dig_hotplug_reg)
     *long_mask |= BIT(i);

other than this, this change looks good.

Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>


>   
> diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
> index 3c53aac..8cda7b9 100644
> --- a/drivers/gpu/drm/i915/intel_hotplug.c
> +++ b/drivers/gpu/drm/i915/intel_hotplug.c
> @@ -29,17 +29,23 @@
>   #include "i915_drv.h"
>   #include "intel_drv.h"
>   
> -enum port intel_hpd_pin_to_port(enum hpd_pin pin)
> +bool intel_hpd_pin_to_port(enum hpd_pin pin, enum port *port)
>   {
>   	switch (pin) {
> +	case HPD_PORT_A:
> +		*port = PORT_A;
> +		return true;
>   	case HPD_PORT_B:
> -		return PORT_B;
> +		*port = PORT_B;
> +		return true;
>   	case HPD_PORT_C:
> -		return PORT_C;
> +		*port = PORT_C;
> +		return true;
>   	case HPD_PORT_D:
> -		return PORT_D;
> +		*port = PORT_D;
> +		return true;
>   	default:
> -		return PORT_A; /* no hpd */
> +		return false;	/* no hpd */
>   	}
>   }
>   
> @@ -322,8 +328,8 @@ void intel_hpd_irq_handler(struct drm_device *dev,
>   		if (!(BIT(i) & pin_mask))
>   			continue;
>   
> -		port = intel_hpd_pin_to_port(i);
> -		is_dig_port = port && dev_priv->hotplug.irq_port[port];
> +		is_dig_port = intel_hpd_pin_to_port(i, &port) &&
> +			      dev_priv->hotplug.irq_port[port];
>   
>   		if (is_dig_port) {
>   			bool long_hpd = long_mask & BIT(i);

-- 
regards,
Sivakumar


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