[igt-dev] [PATCH] [i-g-t] tests/amdgpu/amd_link_settings: use mode 640x480 for link configuration test

[Alex Hung]

Reviewed-by: Alex Hung <alex.hung at amd.com>

On 2023-04-25 15:47, Hersen Wu wrote:
> with 4k dp connected, amdgpu kernel warning message dp_blank timeout
> happens intermittently. link configuration <1, 1.62> could not support
> 4k mode. dp safe mode 640x480 at 60hz could be used for all link
> configuration test.
> 
> video timing bw in bits: pixel_clock x bits_per_color x 3
> dp lane bw in bits: link_rate x lane_count x 8 / 10
> 
> Signed-off-by: Hersen Wu <hersenxs.wu at amd.com>
> ---
>   tests/amdgpu/amd_link_settings.c | 22 +++++++++++++++++++++-
>   1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/amdgpu/amd_link_settings.c b/tests/amdgpu/amd_link_settings.c
> index 14c8c4d7..28aa5da5 100644
> --- a/tests/amdgpu/amd_link_settings.c
> +++ b/tests/amdgpu/amd_link_settings.c
> @@ -159,6 +159,21 @@ static void run_link_training_config(data_t *data, igt_output_t *output)
>   	}
>   }
>   
> +static const drmModeModeInfo dp_safe_mode_640_480 = {
> +	.name		= "640x480",
> +	.vrefresh	= 60,
> +	.clock		= 25200,
> +	.hdisplay	= 640,
> +	.hsync_start	= 656,
> +	.hsync_end	= 752,
> +	.htotal		= 800,
> +	.vdisplay	= 480,
> +	.vsync_start	= 490,
> +	.vsync_end	= 492,
> +	.vtotal		= 525,
> +	.flags		= DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
> +};
> +
>   static void test_link_training_configs(data_t *data)
>   {
>   	const drmModeModeInfo *orig_mode;
> @@ -177,7 +192,12 @@ static void test_link_training_configs(data_t *data)
>   		/* Init only if display supports link_settings */
>   		test_init(data, output);
>   
> -		orig_mode = igt_output_get_mode(output);
> +		/* run_link_training_config run test from <1, 1.62>
> +		 * to highest link configuration. to make sure mode timing
> +		 * be fitted into <1, 1.62> and higher configuration, use
> +		 * dp safe mode 640x480 at 60hz
> +		 */
> +		orig_mode = &dp_safe_mode_640_480;
>   		igt_assert(orig_mode);
>   		igt_output_override_mode(output, orig_mode);
>