linux-kernel - Re: [PATCH] drm/stm: ltdc: fix data enable polarity

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Date:   Sat, 30 Mar 2019 03:02:23 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Yannick Fertré <yannick.fertre@...com>,
        Philippe Cornu <philippe.cornu@...com>,
        Vincent Abriou <vincent.abriou@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        dri-devel@...ts.freedesktop.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/stm: ltdc: fix data enable polarity


On 3/29/2019 9:20 PM, Yannick Fertré wrote:
> Wrong DISPLAY_FLAGS used to set the data enable polarity.
Used or checked.
Can you also explain how it is wrong to check against this FLAG in commit?
>
> Signed-off-by: Yannick Fertré <yannick.fertre@...com>
> ---
>   drivers/gpu/drm/stm/ltdc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index b1741a9..6ba326a 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -555,7 +555,7 @@ static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
>   	if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH)
>   		val |= GCR_VSPOL;
>   
> -	if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
> +	if (vm.flags & DISPLAY_FLAGS_DE_LOW)
>   		val |= GCR_DEPOL;
>   
>   	if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)