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

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Date:   Tue, 26 Apr 2022 17:59:01 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Fabien Parent <fparent@...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

Hi,

On 26/04/2022 17:39, Fabien Parent wrote:
> 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.

Thanks for confirming:
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>

> 
> Fabien
> 
>>
>> Neil