linux-kernel - Re: [PATCH] drm/pl111: add ARM

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Date:   Mon, 22 May 2017 18:32:31 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>,
        Kukjin Kim <kgene@...nel.org>,
        Colin Ian King <colin.king@...onical.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/pl111: add ARM_AMBA dependency

On Mon, May 22, 2017 at 05:20:08PM +0200, Arnd Bergmann wrote:
> The driver is written in a way to enable compile-testing without CONFIG_ARM_AMBA,
> but it just causes needless warnings:
> 
> drivers/gpu/drm/pl111/pl111_drv.c:149:26: error: 'pl111_drm_driver' defined but not used [-Werror=unused-variable]
> drivers/gpu/drm/pl111/pl111_drv.c:81:12: error: 'pl111_modeset_init' defined but not used [-Werror=unused-function]
> 
> This removes the #ifdef instead, and adds a dependency on ARM_AMBA to
> only let us build the driver when the base support is enabled.
> 
> Unfortunately, this requires removing one redundant 'select ARM_AMBA'
> line from mach-s3c64xx to avoid a circular dependency.
> 
> It might be good to allow manually enabling ARM_AMBA when COMPILE_TEST
> is turned on, but that should be a separate patch and may cause other
> build regressions.
> 
> Fixes: bed41005e617 ("drm/pl111: Initial drm/kms driver for pl111")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm/mach-s3c64xx/Kconfig     | 1 -
>  drivers/gpu/drm/pl111/Kconfig     | 1 +
>  drivers/gpu/drm/pl111/pl111_drv.c | 2 --
>  3 files changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-s3c64xx/Kconfig b/arch/arm/mach-s3c64xx/Kconfig
> index 459214fa20b4..5ee5ad74a3d6 100644
> --- a/arch/arm/mach-s3c64xx/Kconfig
> +++ b/arch/arm/mach-s3c64xx/Kconfig
> @@ -40,7 +40,6 @@ config CPU_S3C6410
>  
>  config S3C64XX_PL080
>  	def_bool DMADEVICES
> -	select ARM_AMBA

I must admit that I miss how pl111 DRM driver create circular dependency
with S3C64XX_PL080 (or AMBA_PL08X?). Maybe it is unrelated change and
should be a separate patch?

Best regards,
Krzysztof


>  	select AMBA_PL08X
>  
>  config S3C64XX_SETUP_SDHCI
> diff --git a/drivers/gpu/drm/pl111/Kconfig b/drivers/gpu/drm/pl111/Kconfig
> index 309f4fd52de7..e2f393fcc4bf 100644
> --- a/drivers/gpu/drm/pl111/Kconfig
> +++ b/drivers/gpu/drm/pl111/Kconfig
> @@ -2,6 +2,7 @@ config DRM_PL111
>  	tristate "DRM Support for PL111 CLCD Controller"
>  	depends on DRM
>  	depends on ARM || ARM64 || COMPILE_TEST
> +	depends on ARM_AMBA
>  	depends on COMMON_CLK
>  	select DRM_KMS_HELPER
>  	select DRM_KMS_CMA_HELPER
> diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
> index 97095b1aa961..dce382f97f8c 100644
> --- a/drivers/gpu/drm/pl111/pl111_drv.c
> +++ b/drivers/gpu/drm/pl111/pl111_drv.c
> @@ -179,7 +179,6 @@ static struct drm_driver pl111_drm_driver = {
>  #endif
>  };
>  
> -#ifdef CONFIG_ARM_AMBA
>  static int pl111_amba_probe(struct amba_device *amba_dev,
>  			    const struct amba_id *id)
>  {
> @@ -262,7 +261,6 @@ static struct amba_driver pl111_amba_driver = {
>  };
>  
>  module_amba_driver(pl111_amba_driver);
> -#endif /* CONFIG_ARM_AMBA */
>  
>  MODULE_DESCRIPTION(DRIVER_DESC);
>  MODULE_AUTHOR("ARM Ltd.");
> -- 
> 2.9.0
> 
> --
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