[igt-dev] [PATCH i-g-t 1/3] igt/kms_fbcon_fbt: Handle ENODEV when checking i915_edp_psr_status for chipset support

[Chris Wilson]

Quoting Marta Lofstedt (2018-02-22 07:43:41)
> If the machine doesn't support PSR, it will return -ENODEV from
> i915_edp_psr_status, which we want to interpret as unsupported.
> This is in line with what Chris just fixed for FBC.
> 
> Signed-off-by: Marta Lofstedt <marta.lofstedt at intel.com>
> ---
>  tests/kms_fbcon_fbt.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tests/kms_fbcon_fbt.c b/tests/kms_fbcon_fbt.c
> index 1b236f8b..6aa171e6 100644
> --- a/tests/kms_fbcon_fbt.c
> +++ b/tests/kms_fbcon_fbt.c
> @@ -164,6 +164,8 @@ static bool psr_supported_on_chipset(int fd)
>  {
>         char buf[256];
>  
> +       if (*buf == '\0') /* !HAS_PSR -> -ENODEV*/
> +               return false;
>         igt_debugfs_read(fd, "i915_edp_psr_status", buf);

After the read :)

>         return strstr(buf, "Sink_Support: yes\n");
>  }