linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915/sdvo: Fully translate sync flags in the dtd->mode conversion

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Message-ID: <20130910093824.GJ11428@intel.com>
Date:	Tue, 10 Sep 2013 12:38:24 +0300
From:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] [PATCH] drm/i915/sdvo: Fully translate sync flags in
 the dtd->mode conversion

On Tue, Sep 10, 2013 at 10:02:48AM +0200, Daniel Vetter wrote:
> Instead of just a flag bit for each of the positive/negative sync
> modes drm actually uses a separate flag for each ... This upsets the
> modeset checker since the adjusted mode filled out at modeset time
> doesn't match the one reconstructed at check time (since the
> ->get_config callback already gets this right).
> 
> Reported-by: Knut Petersen <Knut_Petersen@...nline.de>
> Cc: Knut Petersen <Knut_Petersen@...nline.de>
> References: http://www.gossamer-threads.com/lists/linux/kernel/1778688?do=post_view_threaded
> Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
> ---
>  drivers/gpu/drm/i915/intel_sdvo.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
> index 85037b9..5033c74 100644
> --- a/drivers/gpu/drm/i915/intel_sdvo.c
> +++ b/drivers/gpu/drm/i915/intel_sdvo.c
> @@ -866,8 +866,12 @@ static void intel_sdvo_get_mode_from_dtd(struct drm_display_mode * mode,
>  		mode->flags |= DRM_MODE_FLAG_INTERLACE;
>  	if (dtd->part2.dtd_flags & DTD_FLAG_HSYNC_POSITIVE)
>  		mode->flags |= DRM_MODE_FLAG_PHSYNC;
> +	else
> +		mode->flags |= DRM_MODE_FLAG_NHSYNC;
>  	if (dtd->part2.dtd_flags & DTD_FLAG_VSYNC_POSITIVE)
>  		mode->flags |= DRM_MODE_FLAG_PVSYNC;
> +	else
> +		mode->flags |= DRM_MODE_FLAG_NVSYNC;

Actually it seems we don't recreate the mode from scratch here, so we
should also clear the negative sync flags (and the interlace flag too) 
before we set them.

>  }
>  
>  static bool intel_sdvo_check_supp_encode(struct intel_sdvo *intel_sdvo)
> -- 
> 1.8.4.rc3
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC
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