[igt-dev] [PATCH i-g-t] tests/kms_psr2_su: Print errno while it fails to read debugfs

[Souza, Jose]

On Thu, 2020-06-11 at 16:52 +0300, Gwan-gyeong Mun wrote:
> This tests is being sporadically skipped in CI as it is not due
> "PSR sink not reliable: yes". This commit adds printing of debugfs
> ("tests/kms_psr2_su: Print debugfs when skipping test"), but it is not
> enough to track error cases.
> It adds printing of errorno while it fails to read debugfs.
> 

Reviewed-by: José Roberto de Souza <jose.souza at intel.com>

> Cc: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> ---
>  lib/igt_psr.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/igt_psr.c b/lib/igt_psr.c
> index 8c2f4ce6..899784dc 100644
> --- a/lib/igt_psr.c
> +++ b/lib/igt_psr.c
> @@ -40,9 +40,15 @@ static bool psr_active_check(int debugfs_fd, enum psr_mode mode)
>  {
>  	char buf[PSR_STATUS_MAX_LEN];
>  	const char *state = mode == PSR_MODE_1 ? "SRDENT" : "DEEP_SLEEP";
> +	int ret;
>  
> -	igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status", buf,
> -				sizeof(buf));
> +	ret = igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status",
> +				     buf, sizeof(buf));
> +	if (ret < 0) {
> +		igt_debug("Could not read i915_edp_psr_status: %s\n",
> +			  strerror(-ret));
> +		return false;
> +	}
>  
>  	igt_skip_on(strstr(buf, "PSR sink not reliable: yes"));
>  
> @@ -237,8 +243,11 @@ void psr_print_debugfs(int debugfs_fd)
>  
>  	ret = igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status", buf,
>  				      sizeof(buf));
> -	if (ret < 0)
> +	if (ret < 0) {
> +		igt_debug("Could not read i915_edp_psr_status: %s\n",
> +			  strerror(-ret));
>  		return;
> +	}
>  
>  	igt_debug("%s", buf);
>  }