[igt-dev] [PATCH i-g-t] tests/kms_setmode: Handle eDP with fixed mode better.

[Ville Syrjälä]

On Thu, Apr 25, 2019 at 10:54:28AM +0200, Maarten Lankhorst wrote:
> When running the stealing tests, we set the same mode on the eDP and
> the other connector. If the eDP is 4k, we may try to set a mode that
> is not supported on the other connector, which might be 1080p.
> 
> Fix this by selecting the smallest default mode, based on clock.
> Hopefully this is more likely to be supported on all connectors,
> instead always using the first connector's mode.

A hardcoded small mode might work too, but this seem like a sane
apporach as well.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110391
> ---
>  tests/kms_setmode.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/tests/kms_setmode.c b/tests/kms_setmode.c
> index c40c723d4c74..447da2beb5f6 100644
> --- a/tests/kms_setmode.c
> +++ b/tests/kms_setmode.c
> @@ -210,11 +210,14 @@ static void get_mode_for_crtc(struct crtc_config *crtc,
>  	}
>  
>  	/*
> -	 * If none is found then just pick the default mode of the first
> -	 * connector and hope the other connectors can support it by scaling
> -	 * etc.
> +	 * If none is found then just pick the default mode from all connectors
> +	 * with the smallest clock, hope the other connectors can support it by
> +	 * scaling etc.
>  	 */
>  	mode = crtc->cconfs[0].default_mode;
> +	for (i = 1; i < crtc->connector_count; i++)
> +		if (crtc->cconfs[i].default_mode.clock < mode.clock)
> +			mode = crtc->cconfs[i].default_mode;

I do wonder why we're making a copy of the mode here, and then another
one when assigning mode_ret. Could change 'mode' to be a pointer
perhaps.

>  found:
>  	*mode_ret = mode;
>  }
> -- 
> 2.20.1
> 
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-- 
Ville Syrjälä
Intel