[Intel-gfx] [PATCH] drm/i915: Really ignore long HPD pulses on eDP

[Jani Nikula]

On Tue, 10 Feb 2015, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Return IRQ_HANDLED from intel_dp_hpd_pulse() to properly
> ignore the long HPD pulse on eDP to avoid the never ending
> VDD off->HPD->VDD on->VDD off->HPD... cycle.
>
> This fixes a regression intoduced by
>  commit b2c5c181ed18490648a02f8c7d562a3b9e8b96de
>  Author: Daniel Vetter <daniel.vetter at ffwll.ch>
>  Date:   Fri Jan 23 06:00:31 2015 +0100
>
>     drm/i915: Use symbolic irqreturn for ->hpd_pulse
>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> Jani, I decided against the goto out solution because it would have looked like
>  ret = IRQ_HANDLED;
>  goto out;
> which seemed a bit silly.

Ack.

Jani.

>
>  drivers/gpu/drm/i915/intel_dp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 33b1b82..cc711ac 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4499,7 +4499,7 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
>  		 */
>  		DRM_DEBUG_KMS("ignoring long hpd on eDP port %c\n",
>  			      port_name(intel_dig_port->port));
> -		return false;
> +		return IRQ_HANDLED;
>  	}
>  
>  	DRM_DEBUG_KMS("got hpd irq on port %c - %s\n",
> -- 
> 2.0.5
>

-- 
Jani Nikula, Intel Open Source Technology Center