linux-kernel - Re: [PATCH] drm/bridge: ite-it6505: add missing Kconfig option select

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Date:   Tue, 26 Apr 2022 17:39:31 +0200
From:   Fabien Parent <fparent@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Hermes Wu <hermes.wu@....com.tw>,
        Allen Chen <allen.chen@....com.tw>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: ite-it6505: add missing Kconfig option select

On Tue, Apr 26, 2022 at 05:29:31PM +0200, Neil Armstrong wrote:
> On 26/04/2022 16:15, Fabien Parent wrote:
> > The IT6505 is using functions provided by the DRM_DP_HELPER driver.
> > In order to avoid having the bridge enabled but the helper disabled,
> > let's add a select in order to be sure that the DP helper functions are
> > always available.
> > 
> > Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
> > Signed-off-by: Fabien Parent <fparent@...libre.com>
> > ---
> >   drivers/gpu/drm/bridge/Kconfig | 1 +
> >   1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> > index 007e5a282f67..2145b08f9534 100644
> > --- a/drivers/gpu/drm/bridge/Kconfig
> > +++ b/drivers/gpu/drm/bridge/Kconfig
> > @@ -78,6 +78,7 @@ config DRM_ITE_IT6505
> >           tristate "ITE IT6505 DisplayPort bridge"
> >           depends on OF
> >           select DRM_KMS_HELPER
> > +        select DRM_DP_HELPER
> >           select EXTCON
> >           help
> >             ITE IT6505 DisplayPort bridge chip driver.
> 
> http://lore.kernel.org/r/20220403151637.15546-1-rdunlap@infradead.org also select DRM_DP_AUX_BUS,
> can you check if this is really neaded ?

Oops, I didn't notice that patch.

Anyway I can successfully link with the following config:
CONFIG_DRM_ITE_IT6505=y
CONFIG_DRM_DP_AUX_BUS=m
CONFIG_DRM_DP_HELPER=y

But I cannot with the following config:
CONFIG_DRM_ITE_IT6505=y
CONFIG_DRM_DP_AUX_BUS=m
CONFIG_DRM_DP_HELPER=m

This suggest that DRM_DP_AUX_BUS is not required for that driver.

Fabien

> 
> Neil

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