Re: [PATCH i-g-t v4 5/5] lib/igt_kms: Added pipe_id_to_vbl_flag() to igt_kms.

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Apr 26, 2016 at 11:54:22AM -0400, robert.foss@collabora.com wrote:
> From: Robert Foss <robert.foss@collabora.com>
> 
> Added function pipe_id_to_vbl_flag() to igt_kms.
> This function formats a pipe_id into the format
> expected by DRM while processing DRM_IOCTL_WAIT_VBLANK.
> 
> Signed-off-by: Robert Foss <robert.foss@collabora.com>
> ---
>  lib/igt_kms.c | 16 ++++++++++++++++
>  lib/igt_kms.h |  1 +
>  2 files changed, 17 insertions(+)
> 
> diff --git a/lib/igt_kms.c b/lib/igt_kms.c
> index 99b6279..48b95e6 100644
> --- a/lib/igt_kms.c
> +++ b/lib/igt_kms.c
> @@ -2557,3 +2557,19 @@ void igt_reset_connectors(void)
>  		close(fd);
>  	}
>  }
> +
> +/**
> + * pipe_id_to_vbl_flag:
> + *
> + * Convert a pipe if into the flag representation
> + * expected in DRM while processing DRM_IOCTL_WAIT_VBLANK.
> + */
> +uint32_t pipe_id_to_vbl_flag(uint32_t pipe_id)
> +{
> +	if (pipe_id == 0)
> +		return 0;
> +	else if (pipe_id == 1)
> +		return 1 | _DRM_VBLANK_SECONDARY;

The '1 |' means this will always end up as DRM_VBLANK_RELATIVE.

> +	else
> +		return pipe_id << 1;
> +}
> diff --git a/lib/igt_kms.h b/lib/igt_kms.h
> index d9a4e11..f74edaf 100644
> --- a/lib/igt_kms.h
> +++ b/lib/igt_kms.h
> @@ -400,6 +400,7 @@ void igt_wait_for_vblank(int drm_fd, enum pipe pipe);
>  
>  void igt_enable_connectors(void);
>  void igt_reset_connectors(void);
> +uint32_t pipe_id_to_vbl_flag(uint32_t pipe_id);
>  
>  #define EDID_LENGTH 128
>  const unsigned char* igt_kms_get_base_edid(void);
> -- 
> 2.5.0
> 
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-- 
Ville Syrjälä
Intel OTC
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