[PATCH 1/2] lib/amd: check output has hpd before trigger hotplug

[Harry Wentland]

On 2024-03-20 22:03, Alex Hung wrote:
> With commit ff1d9a601 writeback connector will be enabled and it has no
> hotplug capability. As a result, this function always fails for such
> cases. This is fixed by checking HDP in advance.
> 
> Signed-off-by: Alex Hung <alex.hung at amd.com>

Reviewed-by: Harry Wentland <harry.wentland at amd.com>

Harry

> ---
>  lib/igt_amd.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/lib/igt_amd.c b/lib/igt_amd.c
> index d0b53c08a..623883dbc 100644
> --- a/lib/igt_amd.c
> +++ b/lib/igt_amd.c
> @@ -799,6 +799,9 @@ int igt_amd_trigger_hotplug(int drm_fd, char *connector_name)
>          int wr_len;
>          const char *enable_hpd = "1";
>  
> +	if (!igt_amd_output_has_hpd(drm_fd, connector_name))
> +		return 0;
> +
>          fd = igt_debugfs_connector_dir(drm_fd, connector_name, O_RDONLY);
>          igt_assert(fd >= 0);
>          hpd_fd = openat(fd, DEBUGFS_HPD_TRIGGER, O_WRONLY);