linux-kernel - Re: [RFC][PATCH 2/5 v2] drm/bridge: adv7511: Switch to using drm_kms_helper_hotplug

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Date:   Tue, 29 Nov 2016 08:50:44 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Archit Taneja <architt@...eaurora.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [RFC][PATCH 2/5 v2] drm/bridge: adv7511: Switch to using drm_kms_helper_hotplug_event()

Hi John,

Thank you for the patch.

On Monday 28 Nov 2016 21:04:41 John Stultz wrote:
> In chasing down a previous issue with EDID probing from calling
> drm_helper_hpd_irq_event() from irq context, Laurent noticed
> that the DRM documentation suggests that
> drm_kms_helper_hotplug_event() should be used instead.
> 
> Thus this patch replaces drm_helper_hpd_irq_event() with
> drm_kms_helper_hotplug_event().
> 
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Archit Taneja <architt@...eaurora.org>
> Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>
> Cc: Lars-Peter Clausen <lars@...afoo.de>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c index b38e743..2caca0c
> 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> @@ -406,7 +406,7 @@ static void adv7511_irq_work(struct work_struct *work)
>  {
>  	struct adv7511 *adv7511 = container_of(work, struct adv7511, 
irq_work);
> 
> -	drm_helper_hpd_irq_event(adv7511->connector.dev);
> +	drm_kms_helper_hotplug_event(adv7511->connector.dev);

That's nice, but you must first update adv7511->connector.status (and as an 
optimization only call drm_kms_helper_hotplug_event() if the status has 
changed).

>  }

-- 
Regards,

Laurent Pinchart