linux-kernel - Re: [PATCH] drm/panel: update innolux n116bge timings

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Message-ID: <20140922083929.GG1470@ulmo>
Date:	Mon, 22 Sep 2014 10:39:30 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Daniel Kurtz <djkurtz@...omium.org>
Cc:	dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
	linux-kernel@...r.kernel.org,
	Stéphane Marchesin <marcheu@...omium.org>
Subject: Re: [PATCH] drm/panel: update innolux n116bge timings

On Tue, Sep 02, 2014 at 10:56:46AM +0800, Daniel Kurtz wrote:
> There are several different models of N116BGE.  According to the commit
> that added innolux_n116bge_mode [0], this N116BGE is for the eDP variety.
> 
> [0] commit 0a2288c06aab73c966e82045c8f20b0e713baf2a
>  Author: Thierry Reding <treding@...dia.com>
>  Date:   Thu Jul 3 14:02:59 2014 +0200
> 
>    drm/panel: simple: Add Innolux N116BGE panel support
> 
> The clock and htotal values from add by that patch are out of spec according to
> the datasheets I have seen for the eDP N116BGE (-EA2 and -EB2).

Does out of spec imply that these timings aren't working for you?

> This patch changes the values to the "Typ" values on the datasheet.

The original patch was based on -E42 of the datasheet. But I can run
some tests to see if the timings in this patch work on the panel that I
have. If so I guess the easiest would be to apply this.

It shouldn't matter all that much since the panel has EDID if I remember
correctly. The modes parsed from EDID should take precedence over the
fixed mode. If they don't then that's a bug.

Thierry

> 
> Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
> ---
> 
> Thierry,
> 
> It is possible that your timings were correct for the panel you are using on
> the norrin reference board.  In that case I'm happy to upload a new patch
> that creates a new panel entry.  However, I'm pretty sure we are using the
> same N116BGE.
> 
>  drivers/gpu/drm/panel/panel-simple.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 4ce1db0..776764a 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -519,15 +519,15 @@ static const struct panel_desc foxlink_fl500wvr00_a0t = {
>  };
>  
>  static const struct drm_display_mode innolux_n116bge_mode = {
> -	.clock = 71000,
> +	.clock = 76420,
>  	.hdisplay = 1366,
> -	.hsync_start = 1366 + 64,
> -	.hsync_end = 1366 + 64 + 6,
> -	.htotal = 1366 + 64 + 6 + 64,
> +	.hsync_start = 1366 + 136,
> +	.hsync_end = 1366 + 136 + 30,
> +	.htotal = 1366 + 136 + 30 + 60,
>  	.vdisplay = 768,
>  	.vsync_start = 768 + 8,
> -	.vsync_end = 768 + 8 + 4,
> -	.vtotal = 768 + 8 + 4 + 8,
> +	.vsync_end = 768 + 8 + 12,
> +	.vtotal = 768 + 8 + 12 + 12,
>  	.vrefresh = 60,
>  	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
>  };
> -- 
> 2.1.0.rc2.206.gedb03e5
> 

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