linux-kernel - Re: [PATCH 2/2] drm/panel: NT39016: Add support for 50 Hz refresh rate

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Message-ID: <20200408100536.GB20795@ravnborg.org>
Date:   Wed, 8 Apr 2020 12:05:36 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Thierry Reding <thierry.reding@...il.com>, od@...c.me,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/panel: NT39016: Add support for 50 Hz refresh
 rate

Hi Paul.

On Wed, Apr 08, 2020 at 11:58:30AM +0200, Paul Cercueil wrote:
> By changing the pixel clock and the length of the back porch, it is
> possible to obtain a perfect 50 Hz refresh rate.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>

Lower case in $subject.

Acked-by: Sam Ravnborg <sam@...nborg.org>

> ---
>  drivers/gpu/drm/panel/panel-novatek-nt39016.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-novatek-nt39016.c b/drivers/gpu/drm/panel/panel-novatek-nt39016.c
> index f1286cf6528b..05cae8d62d56 100644
> --- a/drivers/gpu/drm/panel/panel-novatek-nt39016.c
> +++ b/drivers/gpu/drm/panel/panel-novatek-nt39016.c
> @@ -325,7 +325,7 @@ static int nt39016_remove(struct spi_device *spi)
>  }
>  
>  static const struct drm_display_mode kd035g6_display_modes[] = {
> -	{
> +	{	/* 60 Hz */
>  		.clock = 6000,
>  		.hdisplay = 320,
>  		.hsync_start = 320 + 10,
> @@ -338,6 +338,19 @@ static const struct drm_display_mode kd035g6_display_modes[] = {
>  		.vrefresh = 60,
>  		.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
>  	},
> +	{	/* 50 Hz */
> +		.clock = 5400,
> +		.hdisplay = 320,
> +		.hsync_start = 320 + 42,
> +		.hsync_end = 320 + 42 + 50,
> +		.htotal = 320 + 42 + 50 + 20,
> +		.vdisplay = 240,
> +		.vsync_start = 240 + 5,
> +		.vsync_end = 240 + 5 + 1,
> +		.vtotal = 240 + 5 + 1 + 4,
> +		.vrefresh = 50,
> +		.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
> +	},
>  };
>  
>  static const struct nt39016_panel_info kd035g6_info = {
> -- 
> 2.25.1