linux-kernel - Re: [PATCH] drm: rcar_du: DRM_RCAR_DU optionally depends on RCAR_MIPI

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Date:   Wed, 2 Nov 2022 23:06:45 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        LUU HOAI <hoai.luu.ub@...esas.com>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH] drm: rcar_du: DRM_RCAR_DU optionally depends on
 RCAR_MIPI_DSI

ping. I have verified (on linux-next-20221103) that this is still needed.
Thanks.

On 10/18/22 11:18, Randy Dunlap wrote:
> When CONFIG_DRM_RCAR_DU=y and CONFIG_DRM_RCAR_MIPI_DSI=m, calls
> from the builtin driver to the mipi driver fail due to linker
> errors.
> Since the RCAR_MIPI_DSI driver is not always required, fix the
> build error by making DRM_RCAR_DU optionally depend on the
> RCAR_MIPI_DSI Kconfig symbol. This prevents the problematic
> kconfig combination without requiring that RCAR_MIPI_DSI always
> be enabled.
> 
> aarch64-linux-ld: drivers/gpu/drm/rcar-du/rcar_du_crtc.o: in function `rcar_du_crtc_atomic_enable':
> rcar_du_crtc.c:(.text+0x3a18): undefined reference to `rcar_mipi_dsi_pclk_enable'
> aarch64-linux-ld: drivers/gpu/drm/rcar-du/rcar_du_crtc.o: in function `rcar_du_crtc_atomic_disable':
> rcar_du_crtc.c:(.text+0x47cc): undefined reference to `rcar_mipi_dsi_pclk_disable'
> 
> Fixes: 957fe62d7d15 ("drm: rcar-du: Fix DSI enable & disable sequence")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> Cc: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Cc: LUU HOAI <hoai.luu.ub@...esas.com>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-renesas-soc@...r.kernel.org
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> ---
>  drivers/gpu/drm/rcar-du/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff -- a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
> --- a/drivers/gpu/drm/rcar-du/Kconfig
> +++ b/drivers/gpu/drm/rcar-du/Kconfig
> @@ -4,6 +4,7 @@ config DRM_RCAR_DU
>  	depends on DRM && OF
>  	depends on ARM || ARM64
>  	depends on ARCH_RENESAS || COMPILE_TEST
> +	depends on DRM_RCAR_MIPI_DSI || DRM_RCAR_MIPI_DSI=n
>  	select DRM_KMS_HELPER
>  	select DRM_GEM_DMA_HELPER
>  	select VIDEOMODE_HELPERS

-- 
~Randy