[igt-dev] [PATCH 1/2] lib/ioctl_wrappers: Query if device supports set/get legacy tiling

[Dixit, Ashutosh]

On Thu, 14 Nov 2019 21:33:25 -0800, Vanshidhar Konda wrote:
>
> Add a method to query if the device supports setting and
> getting legacy tiling formats for buffer objects.
>
> Signed-off-by: Vanshidhar Konda <vanshidhar.r.konda at intel.com>
> ---
>  lib/ioctl_wrappers.c | 16 ++++++++++++++++
>  lib/ioctl_wrappers.h |  1 +
>  2 files changed, 17 insertions(+)
>
> diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
> index 628f8b83..837ef2cf 100644
> --- a/lib/ioctl_wrappers.c
> +++ b/lib/ioctl_wrappers.c
> @@ -133,6 +133,22 @@ __gem_get_tiling(int fd, struct drm_i915_gem_get_tiling *arg)
>	return err;
>  }
>
> +/**
> + * gem_has_legacy_hw_tiling:
> + * @fd: open i915 drm file descriptor
> + *
> + * Feature check to query if the device supports setting/getting
> + * legacy tiling formats for buffer objects
> + *
> + * Returns: True if tiling is supported
> + */
> +bool
> +gem_has_legacy_hw_tiling(int fd)
> +{
> +	struct drm_i915_gem_get_tiling arg = {};
> +	return (__gem_get_tiling(fd, &arg) != -EOPNOTSUPP);

Probably just

	return !__gem_get_tiling(fd, &arg);

That is, no need to check for specific error code?