[PATCH i-g-t v4 3/3] tests/kms_hdr: Test brightness manipulation in HDR mode

[Thasleem, Mohammed]

On 10/24/2024 10:22 AM, Santhosh Reddy Guddati wrote:
> Add subtests for backlight control on hdr enabled edp panels
> by changing brightness via sysfs.
>
> use igt_backlight_read and igt_backlight_write from library.
> -->Please format discription correctly.
>
> v4: improve the test description and cosmetics (Suraj).
>
> Signed-off-by: Santhosh Reddy Guddati <santhosh.reddy.guddati at intel.com>
> ---
>   tests/kms_hdr.c | 42 +++++++++++++++++++++++++++++++++++++++++-
>   1 file changed, 41 insertions(+), 1 deletion(-)
>
> diff --git a/tests/kms_hdr.c b/tests/kms_hdr.c
> index f123c6b36..b67902d43 100644
> --- a/tests/kms_hdr.c
> +++ b/tests/kms_hdr.c
> @@ -64,6 +64,10 @@
>    * Description: Tests static toggle with suspend
>    * Functionality: colorspace, static_hdr, suspend
>    *
> + * SUBTEST: brightness-with-hdr
> + * Description: Tests brightness with HDR
> + * Functionality: colorspace, static_hdr
> + *
>    * SUBTEST: static-%s
>    * Description: Tests %arg[1].
>    * Functionality: colorspace, static_hdr
> @@ -81,6 +85,8 @@ IGT_TEST_DESCRIPTION("Test HDR metadata interfaces and bpc switch");
>   #define HDR_STATIC_METADATA_BLOCK       0x06
>   #define USE_EXTENDED_TAG		0x07
>   
> +#define BACKLIGHT_PATH "/sys/class/backlight"
> +
>   /* DRM HDR definitions. Not in the UAPI header, unfortunately. */
>   enum hdmi_metadata_type {
>   	HDMI_STATIC_METADATA_TYPE1 = 0,
> @@ -100,6 +106,7 @@ enum {
>   	TEST_SWAP = 1 << 3,
>   	TEST_INVALID_METADATA_SIZES = 1 << 4,
>   	TEST_INVALID_HDR = 1 << 5,
> +	TEST_BRIGHTNESS = 1 << 6,
>   };
>   
>   /* BPC connector state. */
> @@ -448,6 +455,28 @@ static void fill_hdr_output_metadata_st2048(struct hdr_output_metadata *meta)
>   	meta->hdmi_metadata_type1.max_cll = 500;   /* 500 nits */
>   }
>   
> +static void adjust_brightness(data_t *data, uint32_t flags)
> +{
> +	igt_backlight_context_t context;
> +	int r_bright, w_bright;
> +
> +	snprintf(context.path, PATH_MAX, "intel_backlight");
> +	snprintf(context.backlight_dir_path, PATH_MAX, "%s", BACKLIGHT_PATH);
> +
> +	igt_assert(igt_backlight_read(&context.max, "max_brightness", &context) > -1);
> +	igt_assert(context.max);
> +	igt_assert(igt_backlight_read(&context.old, "brightness", &context) > -1);
> +
> +	for (w_bright = 0; w_bright <= context.max ; w_bright += 50) {
> +		igt_assert_eq(igt_backlight_write(w_bright, "brightness", &context), 0);
> +		igt_display_commit_atomic(&data->display, DRM_MODE_ATOMIC_ALLOW_MODESET, NULL);
> +		igt_assert_eq(igt_backlight_read(&r_bright, "brightness", &context), 0);
> +		igt_assert_eq(w_bright, r_bright);
> +	}
> +
> +	igt_assert_eq(igt_backlight_write(context.old, "brightness", &context), 0);
> +}
> +
>   static void test_static_toggle(data_t *data, enum pipe pipe,
>   			       igt_output_t *output,
>   			       uint32_t flags)
> @@ -483,6 +512,12 @@ static void test_static_toggle(data_t *data, enum pipe pipe,
>   		igt_assert_eq(system("dmesg|tail -n 1000|grep -E \"Unknown EOTF [0-9]+\""), 0);
>   		goto cleanup;
>   	}
> +
> +	if (flags & TEST_BRIGHTNESS) {
> +		igt_require_f(is_intel_device(data->fd), "Only supported on Intel devices\n");
> +		adjust_brightness(data, flags);
> +	}
> +
>   	igt_assert_output_bpc_equal(data->fd, pipe, output->name, 10);
>   
>   	/* Verify that the CRC are equal after DPMS or suspend. */
> @@ -685,7 +720,8 @@ static void test_hdr(data_t *data, uint32_t flags)
>   
>   			igt_dynamic_f("pipe-%s-%s",
>   				      kmstest_pipe_name(pipe), output->name) {
> -				if (flags & (TEST_NONE | TEST_DPMS | TEST_SUSPEND | TEST_INVALID_HDR))
> +				if (flags & (TEST_NONE | TEST_DPMS | TEST_SUSPEND |
> +					     TEST_INVALID_HDR | TEST_BRIGHTNESS))
>   					test_static_toggle(data, pipe, output, flags);
>   				if (flags & TEST_SWAP)
>   					test_static_swap(data, pipe, output);
> @@ -734,6 +770,10 @@ igt_main
>   	igt_subtest_with_dynamic("static-toggle-suspend")
>   		test_hdr(&data, TEST_SUSPEND);
>   
> +	igt_describe("Tests brightness while in HDR mode");
> +	igt_subtest_with_dynamic("brightness-with-hdr")
> +		test_hdr(&data, TEST_BRIGHTNESS);
> +
>   	igt_describe("Tests swapping static HDR metadata");
>   	igt_subtest_with_dynamic("static-swap")
>   		test_hdr(&data, TEST_SWAP);