Re: [PATCH] drm: arm-hdlcd: remove DMA_CMA select

[Liviu Dudau]

On Fri, Jan 01, 2016 at 03:09:10PM +0100, Arnd Bergmann wrote:
> The newly added DRM_HDLCD driver tries to select DMA_CMA, but that is
> not necessarily possible, as not all configurations contain HAVE_DMA_CONTIGUOUS:
> 
> warning: (DRM_HDLCD) selects DMA_CMA which has unmet direct dependencies (HAVE_DMA_CONTIGUOUS && CMA)
> drivers/built-in.o: In function `dma_alloc_from_contiguous':
> :(.text+0x1dee00): undefined reference to `cma_alloc'
> drivers/built-in.o: In function `dma_release_from_contiguous':
> :(.text+0x1dee24): undefined reference to `cma_release'
> 
> This removes the 'select' statement. It is not needed because CMA is meant
> to transparently change the behavior of dma_alloc_coherent to make it succeed
> for larger allocations, but there is no actual build-time dependency, and
> the driver can still work without CMA in many cases.
> 
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Fixes: 1561e558334d ("drm: Add support for ARM's HDLCD controller.")

Acked-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>

Arnd, are you going to send these corrections yourself or should I pull them
into my tree (possibly squashing them before sending the pull request to
Dave Airlie) ?

Best regards,
Liviu

> ---
> Found on ARM randconfig builds with yesterday's linux-next
> 
> diff --git a/drivers/gpu/drm/arm/Kconfig b/drivers/gpu/drm/arm/Kconfig
> index 5e8c8a86860b..2f4d3b7fb871 100644
> --- a/drivers/gpu/drm/arm/Kconfig
> +++ b/drivers/gpu/drm/arm/Kconfig
> @@ -10,7 +10,6 @@ config DRM_HDLCD
>  	depends on DRM_ARM
>  	depends on COMMON_CLK
>  	select COMMON_CLK_SCPI
> -	select DMA_CMA
>  	select DRM_KMS_CMA_HELPER
>  	select DRM_GEM_CMA_HELPER
>  	help
> 

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