[PATCH i-g-t 06/14] lib/igt_kms: add function to check if retrain disabled

[Samala, Pranay]

> -----Original Message-----
> From: igt-dev <igt-dev-bounces at lists.freedesktop.org> On Behalf Of Kunal Joshi
> Sent: Sunday, August 25, 2024 11:44 PM
> To: igt-dev at lists.freedesktop.org
> Cc: Joshi, Kunal1 <kunal1.joshi at intel.com>
> Subject: [PATCH i-g-t 06/14] lib/igt_kms: add function to check if retrain disabled
> 
> add helper to check if retraining is disabled, retraining will be disable if we are at
> the lowest link parameters or the lowest mode supported on a panel
> 
> Signed-off-by: Kunal Joshi <kunal1.joshi at intel.com>
> ---
>  lib/igt_kms.c | 24 ++++++++++++++++++++++++  lib/igt_kms.h |  1 +
>  2 files changed, 25 insertions(+)
> 
> diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 683989e84..2720095d4 100644
> --- a/lib/igt_kms.c
> +++ b/lib/igt_kms.c
> @@ -6869,3 +6869,27 @@ void igt_force_lt_failure(int drm_fd, igt_output_t
> *output, int failure_count)
>  			     value, sizeof(value));
>  	close(dir);
>  }
> +
> +/**
> + * igt_get_dp_link_retrain_disabled:
> + * @drm_fd: A drm file descriptor
> + * @output: Target output
> + *
> + * Returns: True if link retrain disabled, false otherwise  */ bool
> +igt_get_dp_link_retrain_disabled(int drm_fd, igt_output_t *output) {
> +	int dir, res;
> +	char buf[512];
> +
> +	igt_require_f(output->name, "Invalid output");
> +	dir = igt_debugfs_connector_dir(drm_fd, output->name, O_RDONLY);
> +	igt_assert_f(dir >= 0, "Failed to open debugfs dir for connector %s\n",
> +			       igt_output_name(output));

Alignment should match open parenthesis.

Otherwise, code looks good to me.
Regards,
Pranay Samala

> +	res = igt_debugfs_simple_read(dir,
> +				      "i915_dp_link_retrain_disabled",
> +				      buf, sizeof(buf));
> +	close(dir);
> +	igt_require(res > 0);
> +	return strstr(buf, "yes");
> +}
> diff --git a/lib/igt_kms.h b/lib/igt_kms.h index 57829416a..2d69d794a 100644
> --- a/lib/igt_kms.h
> +++ b/lib/igt_kms.h
> @@ -1253,5 +1253,6 @@ enum dp_link_rate igt_get_dp_max_link_rate(int
> drm_fd, igt_output_t *output);  enum dp_lane_count
> igt_get_dp_max_lane_count(int drm_fd, igt_output_t *output);  void
> igt_force_link_retrain(int drm_fd, igt_output_t *output, int retrain_count);  void
> igt_force_lt_failure(int drm_fd, igt_output_t *output, int failure_count);
> +bool igt_get_dp_link_retrain_disabled(int drm_fd, igt_output_t
> +*output);
> 
>  #endif /* __IGT_KMS_H__ */
> --
> 2.43.0