linux-kernel - Re: [Intel-gfx] [PATCH v3 4/5] drm/i915: Clarify flow for disabling IRQs on storms

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Message-ID: <20181105203840.GC4208@intel.com>
Date:   Mon, 5 Nov 2018 12:38:40 -0800
From:   Rodrigo Vivi <rodrigo.vivi@...el.com>
To:     Lyude Paul <lyude@...hat.com>
Cc:     intel-gfx@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH v3 4/5] drm/i915: Clarify flow for disabling
 IRQs on storms

On Fri, Nov 02, 2018 at 08:19:07PM -0400, Lyude Paul wrote:
> This is rather confusing to look at as-is:
> dev_priv->display.hpd_irq_setup(dev_priv); in intel_hpd_irq_handler()
> handles disabling the actual HPD IRQ, while
> intel_hpd_irq_storm_disable() handles moving the HPD pin state over from
> MARK_DISABLED to DISABLED along with enabling polling for it.

what about also changing the name of the function?

> 
> Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> ---
>  drivers/gpu/drm/i915/intel_hotplug.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
> index c11d73de16f2..e5e3eeb7e482 100644
> --- a/drivers/gpu/drm/i915/intel_hotplug.c
> +++ b/drivers/gpu/drm/i915/intel_hotplug.c
> @@ -351,7 +351,7 @@ static void i915_hotplug_work_func(struct work_struct *work)
>  	hpd_event_bits = dev_priv->hotplug.event_bits;
>  	dev_priv->hotplug.event_bits = 0;
>  
> -	/* Disable hotplug on connectors that hit an irq storm. */
> +	/* Enable polling for connectors which had HPD IRQ storms */
>  	intel_hpd_irq_storm_disable(dev_priv);

This now gets confusing to my brain...
comment says "enable" function name is "disable".

>
>  	spin_unlock_irq(&dev_priv->irq_lock);
> @@ -458,6 +458,10 @@ void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
>  		}
>  	}
>  
> +	/*
> +	 * Disable any IRQs that storms were detected on. Polling enablement
> +	 * happens later in our hotplug work.
> +	 */
>  	if (storm_detected && dev_priv->display_irqs_enabled)
>  		dev_priv->display.hpd_irq_setup(dev_priv);
>  	spin_unlock(&dev_priv->irq_lock);
> -- 
> 2.19.1
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

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