linux-kernel - Re: [RFC PATCH] drm: rcar-du: make all sub-symbols depend on DRM_RCAR

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Date:   Fri, 6 Mar 2020 07:09:19 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Koji Matsuoka <koji.matsuoka.xm@...esas.com>,
        David Airlie <airlied@...ux.ie>
Subject: Re: [RFC PATCH] drm: rcar-du: make all sub-symbols depend on
 DRM_RCAR_DU

On 3/6/20 6:28 AM, Laurent Pinchart wrote:
> Hi Randy,
> 
> On Thu, Mar 05, 2020 at 07:17:49PM -0800, Randy Dunlap wrote:
>> From: Randy Dunlap <rdunlap@...radead.org>
>>
>> DRM_RCAR_CMM depends on DRM_RCAR_DU. Since the following Kconfig
>> symbols do not depend on DRM_RCAR_DU, the menu presentation is
>> broken for these and following non-R-Car Kconfig symbols.
>>
>> Is it safe/appropriate to make all of these symbols depend on
>> DRM_RCAR_DU?  It make the kconfig menu presentation much cleaner.
> 
> As those drivers are useless without DRM_RCAR_DU, I'm fine with this
> change. It however prevents test-compiling those drivers when
> DRM_RCAR_DU is disabled, but I see little reason to do so anyway, I
> expect compile tests to aim for as large coverage as possible, and they
> should thus enable DRM_RCAR_DU.
> 
> Would you like to submit a new version without this question, and
> possibly addressing Geert's concern if you think it's appropriate, or
> should I do so when applying ?
> 
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>> Cc: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
>> Cc: dri-devel@...ts.freedesktop.org
>> Cc: linux-renesas-soc@...r.kernel.org
>> Cc: Koji Matsuoka <koji.matsuoka.xm@...esas.com>
>> Cc: Dave Airlie <airlied@...ux.ie>
>> ---
>>  drivers/gpu/drm/rcar-du/Kconfig |    3 +++
>>  1 file changed, 3 insertions(+)
>>
>> --- linux-next-20200305.orig/drivers/gpu/drm/rcar-du/Kconfig
>> +++ linux-next-20200305/drivers/gpu/drm/rcar-du/Kconfig
>> @@ -24,6 +24,7 @@ config DRM_RCAR_CMM
>>  config DRM_RCAR_DW_HDMI
>>  	tristate "R-Car DU Gen3 HDMI Encoder Support"
>>  	depends on DRM && OF
>> +	depends on DRM_RCAR_DU
>>  	select DRM_DW_HDMI
>>  	help
>>  	  Enable support for R-Car Gen3 internal HDMI encoder.
>> @@ -31,6 +32,7 @@ config DRM_RCAR_DW_HDMI
>>  config DRM_RCAR_LVDS
>>  	tristate "R-Car DU LVDS Encoder Support"
>>  	depends on DRM && DRM_BRIDGE && OF
>> +	depends on DRM_RCAR_DU
>>  	select DRM_PANEL
>>  	select OF_FLATTREE
>>  	select OF_OVERLAY
>> @@ -47,4 +49,5 @@ config DRM_RCAR_VSP
>>  
>>  config DRM_RCAR_WRITEBACK
>>  	bool
>> +	depends on DRM_RCAR_DU
>>  	default y if ARM64
> 
> Is this one needed ? The symbol should not be shown in the kconfig menu
> as it has no text.

Hi Laurent,
I tried the patch without that line as my first attempt and there was
still a problem with the menu, so I will resubmit the patch using a block
as Geert suggested.

thanks.
-- 
~Randy