linux-kernel - Re: [PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800

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Message-id: <5758A58D.7050106@samsung.com>
Date:	Thu, 09 Jun 2016 08:09:01 +0900
From:	Inki Dae <inki.dae@...sung.com>
To:	Javier Martinez Canillas <javier@....samsung.com>,
	linux-kernel@...r.kernel.org
Cc:	Marc Zyngier <marc.zyngier@....com>, Kukjin Kim <kgene@...nel.org>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	dri-devel@...ts.freedesktop.org, linux-samsung-soc@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	David Airlie <airlied@...ux.ie>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800

Hi Javier,

2016년 06월 02일 23:20에 Javier Martinez Canillas 이(가) 쓴 글:
> Commit a6f75aa161c5 ("drm/exynos: fimd: add HW trigger support") added
> hardware trigger support to the FIMD controller driver. But this broke
> the display in at least the Exynos5800 Peach Pi Chromebook.
> 
> So until the issue is fixed, avoid using HW trigger for the Exynos5420
> based boards and use SW trigger as it was before the mentioned commit.
> 
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> 
> ---
> 
> Hello Inki,
> 
> Since commit a6f75aa161c5 landed in v4.7-rc1, I think $SUBJECT should be
> picked to make sure that v4.7 is released with the display working for
> the Exynos5420 based Chromebooks.
> 
> We can then figure out what's wrong with the HW trigger support and fix
> it for v4.8.

Agree. And below is a trivial comment.

> 
> Best regards,
> Javier
> 
>  drivers/gpu/drm/exynos/exynos_drm_fimd.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> index 1c23a8ff5e83..f10030ff00e6 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> @@ -170,14 +170,11 @@ static struct fimd_driver_data exynos5420_fimd_driver_data = {
>  	.lcdblk_vt_shift = 24,
>  	.lcdblk_bypass_shift = 15,
>  	.lcdblk_mic_bypass_shift = 11,
> -	.trg_type = I80_HW_TRG,
>  	.has_shadowcon = 1,
>  	.has_vidoutcon = 1,
>  	.has_vtsel = 1,
>  	.has_mic_bypass = 1,
>  	.has_dp_clk = 1,
> -	.has_hw_trigger = 1,
> -	.has_trigger_per_te = 1,

We don't need to remove above two lines. It would be enough to remove 'trg_type = I80_HW_TRG', which makes FIMD to be worked with SW trigger in default.

Thanks,
Inki Dae

>  };
>  
>  struct fimd_context {
>