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Message-ID: <b78d2ca4-9516-4d7e-9ec0-3fe93894523b@linaro.org>
Date: Tue, 6 Feb 2024 09:17:59 +0100
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From: Neil Armstrong <neil.armstrong@linaro.org>
Reply-To: neil.armstrong@linaro.org
Subject: Re: [PATCH 4/5] drm/panel: simple: fix flags on RK043FN48H
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To: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>,
 Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>,
 Maxime Coquelin <mcoquelin.stm32@gmail.com>,
 Alexandre Torgue <alexandre.torgue@foss.st.com>,
 Jessica Zhang <quic_jesszhan@quicinc.com>, Sam Ravnborg <sam@ravnborg.org>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>,
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>
Cc: devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
 dri-devel@lists.freedesktop.org
References: <20240205-ltdc_mp13-v1-0-072d24bf1b36@foss.st.com>
 <20240205-ltdc_mp13-v1-4-072d24bf1b36@foss.st.com>
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On 05/02/2024 10:06, Raphael Gallais-Pou wrote:
> DISPLAY_FLAGS_SYNC_POSEDGE is missing in the flags on the default
> timings. When overriding the default mode with one described in the
> device tree, the mode does not get acked because of this missing flag.
> Moreover since the panel is driven by the positive edge it makes sense
> to add it here.
> 
> Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
> ---
>   drivers/gpu/drm/panel/panel-simple.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 2214cb09678c..7b286382ffb4 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -3523,7 +3523,8 @@ static const struct display_timing rocktech_rk043fn48h_timing = {
>   	.vfront_porch = { 1, 4, 4 },
>   	.vsync_len = { 1, 10, 10 },
>   	.flags = DISPLAY_FLAGS_VSYNC_LOW | DISPLAY_FLAGS_HSYNC_LOW |
> -		 DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_PIXDATA_POSEDGE,
> +		 DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_PIXDATA_POSEDGE |
> +		 DISPLAY_FLAGS_SYNC_POSEDGE,
>   };
>   
>   static const struct panel_desc rocktech_rk043fn48h = {
> 

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>