[PATCH i-g-t] tests/intel/kms_pm_backlight: Brightness test during DPMS on and off

[Naladala, Ramanaidu]

Hi Thasleem,

On 9/27/2024 1:08 AM, Mohammed Thasleem wrote:
> Set brightness by deviding max brightness, store and read it back.
> The actual brightness should be same during DPMS on and off cycle.
>
> v2: Update test path and testplan documentation.
> v3: Check backlight for all internal panels. (Jani)
> v4: Minor changes.

The change to check the backlight for all internal panels (Jani) appears 
unrelated to the current patch. To maintain clarity and consistency in 
our commit history, please update v4 to reflect the patch changes.

Code changes are LGTM,
Reviewed-by: Naladala Ramanaidu <ramanaidu.naladala at intel.com>

>
> Signed-off-by: Mohammed Thasleem <mohammed.thasleem at intel.com>
> ---
>   tests/intel/kms_pm_backlight.c | 23 +++++++++++++++++++++++
>   1 file changed, 23 insertions(+)
>
> diff --git a/tests/intel/kms_pm_backlight.c b/tests/intel/kms_pm_backlight.c
> index 140a95bcc..c93e5b357 100644
> --- a/tests/intel/kms_pm_backlight.c
> +++ b/tests/intel/kms_pm_backlight.c
> @@ -66,6 +66,10 @@
>    * SUBTEST: fade-with-suspend
>    * Description: Test the fade with suspend.
>    * Functionality: backlight, suspend
> + *
> + * SUBTEST: brightness-with-dpms
> + * Description: test brightness with dpms on and off cycle.
> + * Functionality: backlight, backlight
>    */
>   
>   struct context {
> @@ -78,6 +82,7 @@ struct context {
>   enum {
>   	TEST_NONE = 0,
>   	TEST_DPMS,
> +	TEST_DPMS_CYCLE,
>   	TEST_SUSPEND,
>   };
>   
> @@ -213,6 +218,22 @@ check_dpms(igt_output_t *output)
>   	igt_assert(igt_wait_for_pm_status(IGT_RUNTIME_PM_STATUS_ACTIVE));
>   }
>   
> +static void check_dpms_cycle(struct context *context)
> +{
> +	int max, val_1, val_2;
> +
> +	backlight_read(&max, "max_brightness", context);
> +	igt_assert(max);
> +
> +	backlight_write(max / 2, "brightness", context);
> +	backlight_read(&val_1, "actual_brightness", context);
> +
> +	check_dpms(context->output);
> +
> +	backlight_read(&val_2, "actual_brightness", context);
> +	igt_assert_eq(val_1, val_2);
> +}
> +
>   static void
>   check_suspend(igt_output_t *output)
>   {
> @@ -276,6 +297,8 @@ igt_main
>   		{ "bad-brightness", "test the bad brightness.", test_bad_brightness, TEST_NONE },
>   		{ "fade", "test basic fade.", test_fade, TEST_NONE },
>   		{ "fade-with-dpms", "test the fade with DPMS.", test_fade, TEST_DPMS },
> +		{ "brightness-with-dpms", "test brightness with dpms on and off cycle.",
> +		   check_dpms_cycle, TEST_DPMS_CYCLE},
>   		{ "fade-with-suspend", "test the fade with suspend.", test_fade, TEST_SUSPEND },
>   	};
>