linux-kernel - Re: [PATCH] drm/sti: Remove select of CONFIG_FW_LOADER_USER_HELPER

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Date:	Thu, 29 Oct 2015 15:21:35 +0100
From:	Vincent ABRIOU <vincent.abriou@...com>
To:	Takashi Iwai <tiwai@...e.de>,
	Benjamin Gaignard <benjamin.gaignard@...aro.org>
CC:	David Airlie <airlied@...ux.ie>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/sti: Remove select of
 CONFIG_FW_LOADER_USER_HELPER_FALLBACK

Hi Takashi,

Removing FW_LOADER_USER_HELPER_FALLBACK leads to a failure in our HQVDP 
firmware execution.
Indeed, our firmware is not built-in. It is a proprietary firmware 
uploaded into the file system that's why we need the 
USER_HELPER_FALLBACK to be able to load it once file system is available.

BR
Vincent

On 10/19/2015 08:16 AM, Takashi Iwai wrote:
> The commit [4fdbc678fe4d: drm: sti: add HQVDP plane] added the select
> of CONFIG_FW_LOADER_USER_HELPER_FALLBACK by some unwritten reason.
> But this config is known to be harmful, and is present only for
> compatibility reason for an old exotic system that mandates udev
> interaction which isn't supposed to be selected by a driver.
> Let's remove it.
>
> Fixes: 4fdbc678fe4d ('drm: sti: add HQVDP plane')
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> ---
>   drivers/gpu/drm/sti/Kconfig | 1 -
>   1 file changed, 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/sti/Kconfig b/drivers/gpu/drm/sti/Kconfig
> index fbccc105819b..a18159074b76 100644
> --- a/drivers/gpu/drm/sti/Kconfig
> +++ b/drivers/gpu/drm/sti/Kconfig
> @@ -6,7 +6,6 @@ config DRM_STI
>   	select DRM_GEM_CMA_HELPER
>   	select DRM_KMS_CMA_HELPER
>   	select DRM_PANEL
> -	select FW_LOADER_USER_HELPER_FALLBACK
>   	help
>   	  Choose this option to enable DRM on STM stiH41x chipset
>
>--
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