[PATCH i-g-t] tests: (Re)add kms_crtc_background_color test
Kamil Konieczny
kamil.konieczny at linux.intel.com
Wed Nov 19 05:21:49 PST 2025
Hi Cristian,
On 2025-11-10 at 15:18:05 +0200, Cristian Ciocaltea wrote:
> Provide test to verify the behavior of BACKGROUND_COLOR DRM CRTC
> property.
>
> This is done by filling a full-screen primary plane with a given color
> and comparing the resulting CRC with the one obtained after turning off
> all planes while having the CRTC background set to the same color.
>
> It's worth noting this is a reworked version of the test that has been
> dropped over 5 years ago via commit 33f07391e5f6 ("tests: Remove
> kms_crtc_background_color test"), as the required kernel changes never
> landed because of missing userspace support.
>
+cc J-P, Karthik, Swati
Cc: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
Cc: Juha-Pekka Heikkila <juha-pekka.heikkila at intel.com>
Cc: Karthik B S <karthik.b.s at intel.com>
Cc: Swati Sharma <swati2.sharma at intel.com>
I have few nits, see below.
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
> ---
> This has been tested on a Radxa ROCK 5B board which is based on Rockchip
> RK3588 SoC. It relies on the kernel series [1] introducing the
> BACKGROUND_COLOR CRTC property and a few additional patches from [2]
> enabling the required CRC functionality for the Rockchip platform (still
> require a bit more work before sending those upstream).
>
> It's worth noting CRC is only supported by the display controller (VOP2)
> present in the RK3576 SoC variant. However, the computation is done by
> the hardware before applying the background color, hence it has limited
> usage in IGT testing.
>
> Luckily, the frame CRCs can be captured through DPCD, i.e. at
> DisplayPort AUX channel level, hence I used the USB-C DP AltMode capable
> port of the aforementioned board to perform the actual validation.
>
> [1] https://lore.kernel.org/all/20251013-rk3588-bgcolor-v2-0-25cc3810ba8c@collabora.com/
> [2] https://gitlab.collabora.com/hardware-enablement/rockchip-3588/linux/-/commits/cristicc/rk3588-vop2-crc
>
> root at rock5b$ cat /sys/kernel/debug/dri/1/vop2/summary
>
> cat /sys/kernel/debug/dri/1/vop2/summary
> Video Port0: DISABLED
> Video Port1: DISABLED
> Video Port2: ACTIVE
> Connector: DP-1
> bus_format[1018]: RGB101010_1X30
> output_mode[f] color_space[0]
> background color (10bpc): r=0x0 g=0x0 b=0x0
> Display mode: 3840x2160p60
> clk[594000] real_clk[594000] type[48] flag[9]
> H: 3840 4016 4104 4400
> V: 2160 2164 2174 2250
> Cluster2-win0: ACTIVE
> win_id: 2
> format: XR24 little-endian (0x34325258) glb_alpha[0xff]
> rotate: xmirror: 0 ymirror: 0 rotate_90: 0 rotate_270: 0
> zpos: 0
> src: pos[0, 0] rect[3840 x 2160]
> dst: pos[0, 0] rect[3840 x 2160]
> buf[0]: addr: 0x0000000000000000 pitch: 15360 offset: 0
>
> root at rock5b$ ./kms_crtc_background_color --device drm:/dev/dri/card1
>
> IGT-Version: 2.2-g3e4ec308e (aarch64) (Linux: 6.18.0-rc1 aarch64)
> Using IGT_SRANDOM=1762774806 for randomisation
> Opened device: /dev/dri/card1
> Starting subtest: background-color-red
> Starting dynamic subtest: pipe-C-DP-1
> Dynamic subtest pipe-C-DP-1: SUCCESS (0.491s)
> Subtest background-color-red: SUCCESS (0.493s)
> Starting subtest: background-color-green
> Starting dynamic subtest: pipe-C-DP-1
> Dynamic subtest pipe-C-DP-1: SUCCESS (0.533s)
> Subtest background-color-green: SUCCESS (0.535s)
> Starting subtest: background-color-blue
> Starting dynamic subtest: pipe-C-DP-1
> Dynamic subtest pipe-C-DP-1: SUCCESS (0.541s)
> Subtest background-color-blue: SUCCESS (0.544s)
> Starting subtest: background-color-yellow
> Starting dynamic subtest: pipe-C-DP-1
> Dynamic subtest pipe-C-DP-1: SUCCESS (0.535s)
> Subtest background-color-yellow: SUCCESS (0.537s)
> Starting subtest: background-color-purple
> Starting dynamic subtest: pipe-C-DP-1
> Dynamic subtest pipe-C-DP-1: SUCCESS (0.536s)
> Subtest background-color-purple: SUCCESS (0.538s)
> Starting subtest: background-color-cyan
> Starting dynamic subtest: pipe-C-DP-1
> Dynamic subtest pipe-C-DP-1: SUCCESS (0.539s)
> Subtest background-color-cyan: SUCCESS (0.541s)
> Starting subtest: background-color-black
> Starting dynamic subtest: pipe-C-DP-1
> (kms_crtc_background_color:744) igt_pipe_crc-WARNING: Warning on condition all_zero in function crc_sanity_checks, file ../lib/igt_pipe_crc.c:475
> (kms_crtc_background_color:744) igt_pipe_crc-WARNING: Suspicious CRC: All values are 0.
> (kms_crtc_background_color:744) igt_pipe_crc-WARNING: Warning on condition all_zero in function crc_sanity_checks, file ../lib/igt_pipe_crc.c:475
> (kms_crtc_background_color:744) igt_pipe_crc-WARNING: Suspicious CRC: All values are 0.
> Dynamic subtest pipe-C-DP-1: SUCCESS (0.535s)
> Subtest background-color-black: SUCCESS (0.537s)
> Starting subtest: background-color-white
> Starting dynamic subtest: pipe-C-DP-1
> Dynamic subtest pipe-C-DP-1: SUCCESS (0.540s)
> Subtest background-color-white: SUCCESS (0.542s)
> ---
> lib/igt_kms.c | 1 +
> lib/igt_kms.h | 3 +-
> tests/kms_crtc_background_color.c | 139 ++++++++++++++++++++++++++++++++++++++
> tests/meson.build | 1 +
> 4 files changed, 143 insertions(+), 1 deletion(-)
>
> diff --git a/lib/igt_kms.c b/lib/igt_kms.c
> index 9208c8dbfc86..7c0848865038 100644
> --- a/lib/igt_kms.c
> +++ b/lib/igt_kms.c
> @@ -705,6 +705,7 @@ const char * const igt_plane_prop_names[IGT_NUM_PLANE_PROPS] = {
> };
>
> const char * const igt_crtc_prop_names[IGT_NUM_CRTC_PROPS] = {
> + [IGT_CRTC_BACKGROUND] = "BACKGROUND_COLOR",
> [IGT_CRTC_CTM] = "CTM",
> [IGT_CRTC_GAMMA_LUT] = "GAMMA_LUT",
> [IGT_CRTC_GAMMA_LUT_SIZE] = "GAMMA_LUT_SIZE",
> diff --git a/lib/igt_kms.h b/lib/igt_kms.h
> index eff76f0de0b3..a19f8d126a8d 100644
> --- a/lib/igt_kms.h
> +++ b/lib/igt_kms.h
> @@ -156,7 +156,8 @@ void kmstest_restore_vt_mode(void);
> void kmstest_set_vt_text_mode(void);
>
> enum igt_atomic_crtc_properties {
> - IGT_CRTC_CTM = 0,
> + IGT_CRTC_BACKGROUND = 0,
> + IGT_CRTC_CTM,
> IGT_CRTC_GAMMA_LUT,
> IGT_CRTC_GAMMA_LUT_SIZE,
> IGT_CRTC_DEGAMMA_LUT,
> diff --git a/tests/kms_crtc_background_color.c b/tests/kms_crtc_background_color.c
> new file mode 100644
> index 000000000000..4e6d183b736d
> --- /dev/null
> +++ b/tests/kms_crtc_background_color.c
> @@ -0,0 +1,139 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2013,2014 Intel Corporation
> + * Copyright © 2025 Collabora, Ltd.
> + */
> +
Please add here:
/**
* TEST: crtc background color
* Category: Display
* Description: Test background color feature with CRC at CRTC
* Driver requirement: i915, xe
* Mega feature: General Display Features
*/
Feel free to correct me with name and/or description.
Karthik or Swati, please also correct this if I made any
mistake here.
> +#include "igt.h"
> +
> +IGT_TEST_DESCRIPTION("Test crtc background color feature");
> +
> +typedef struct {
> + int drm_fd;
> + int debugfs;
> + igt_display_t display;
> +} data_t;
> +
> +#define __DRM_ARGB64_PREP(c, shift, bpc) \
> + (((__u64)(c) << (16 - (bpc)) & 0xffffU) << (shift))
> +
> +#define DRM_ARGB64_PREP_BPC(alpha, red, green, blue, bpc) \
> + (__DRM_ARGB64_PREP(alpha, 48, bpc) | \
> + __DRM_ARGB64_PREP(red, 32, bpc) | \
> + __DRM_ARGB64_PREP(green, 16, bpc) | \
> + __DRM_ARGB64_PREP(blue, 0, bpc))
> +
> +static void test_background(data_t *data, enum pipe pipe, igt_output_t *output,
> + __u16 red, __u16 green, __u16 blue)
> +{
> + igt_display_t *display = &data->display;
> + igt_crc_t plane_crc, bg_crc;
> + igt_pipe_crc_t *pipe_crc;
> + igt_plane_t *plane;
> + drmModeModeInfo *mode;
> + struct igt_fb fb;
> +
> + igt_display_reset(display);
> +
> + igt_output_set_pipe(output, pipe);
> + mode = igt_output_get_mode(output);
> +
> + plane = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
> +
> + /* Fill the primary plane and set the background to the same color */
> + igt_create_color_fb(data->drm_fd,
> + mode->hdisplay, mode->vdisplay,
> + DRM_FORMAT_XRGB8888,
> + DRM_FORMAT_MOD_NONE,
> + (double)red / 0xffff,
> + (double)green / 0xffff,
> + (double)blue / 0xffff,
> + &fb);
> +
> + igt_plane_set_fb(plane, &fb);
> + igt_pipe_set_prop_value(&data->display, pipe, IGT_CRTC_BACKGROUND,
> + DRM_ARGB64_PREP_BPC(0xffff, red, green, blue, 8));
> + igt_display_commit2(&data->display, COMMIT_ATOMIC);
> +
> + pipe_crc = igt_pipe_crc_new(data->drm_fd, pipe, IGT_PIPE_CRC_SOURCE_AUTO);
> + igt_pipe_crc_collect_crc(pipe_crc, &plane_crc);
> +
> + /* Turn off the primary plane so that only the background is visible */
> + igt_plane_set_fb(plane, NULL);
> + igt_display_commit2(&data->display, COMMIT_ATOMIC);
> + igt_pipe_crc_collect_crc(pipe_crc, &bg_crc);
> +
> + /*
> + * The test assumes hardware is able to generate valid CRCs when setting
> + * the background color. Some platforms, e.g. Intel, might require at
> + * least one plane to be visible before reading the pipe-level ("dmux")
> + * CRC. Other platforms, e.g. Rockchip, do not take background color
> + * into account when computing CRC at CRTC level.
> + * A possible workaround would be to use alternative CRC sources, e.g.
> + * where computation is performed at encoder or sink level.
> + */
> + igt_assert_crc_equal(&plane_crc, &bg_crc);
> +
> + /* Clean-up */
> + igt_pipe_set_prop_value(&data->display, pipe, IGT_CRTC_BACKGROUND,
> + DRM_ARGB64_PREP_BPC(0xffff, 0, 0, 0, 8));
> + igt_pipe_crc_free(pipe_crc);
> + igt_output_set_pipe(output, PIPE_NONE);
> + igt_display_commit(display);
> + igt_remove_fb(data->drm_fd, &fb);
> +}
> +
Add here:
/**
* SUBTEST: background-color-%s
* Description: Tests %arg[1] in background color
*
* arg[1]:
*
* @red: red
* @green: green
* @blue: blue
* @yellow: yellow
* @purple: purple
* @cyan: cyan
* @black: black
* @white: white
*/
With this it will compile and will be tested by Intel CI.
Regards,
Kamil
> +igt_main
> +{
> + igt_output_t *output;
> + data_t data = {};
> + enum pipe pipe;
> + int i;
> +
> + struct {
> + const char *color;
> + __u16 red;
> + __u16 green;
> + __u16 blue;
> + } tests[] = {
> + { "red", 0xffff, 0x0000, 0x0000, },
> + { "green", 0x0000, 0xffff, 0x0000, },
> + { "blue", 0x0000, 0x0000, 0xffff, },
> + { "yellow", 0xffff, 0xffff, 0x0000, },
> + { "purple", 0xffff, 0x0000, 0xffff, },
> + { "cyan", 0x0000, 0xffff, 0xffff, },
> + { "black", 0x0000, 0x0000, 0x0000, },
> + { "white", 0xffff, 0xffff, 0xffff, },
> + };
> +
> + igt_fixture {
> + data.drm_fd = drm_open_driver_master(DRIVER_ANY);
> +
> + kmstest_set_vt_graphics_mode();
> +
> + igt_display_require(&data.display, data.drm_fd);
> + igt_display_require_output(&data.display);
> + igt_require_pipe_crc(data.drm_fd);
> +
> + data.debugfs = igt_debugfs_dir(data.drm_fd);
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(tests); i++) {
> + igt_describe_f("Test crtc background color %s", tests[i].color);
> + igt_subtest_with_dynamic_f("background-color-%s", tests[i].color) {
> + for_each_pipe_with_single_output(&data.display, pipe, output) {
> + igt_require(igt_pipe_has_prop(&data.display, pipe,
> + IGT_CRTC_BACKGROUND));
> +
> + igt_dynamic_f("pipe-%s-%s", kmstest_pipe_name(pipe), output->name)
> + test_background(&data, pipe, output, tests[i].red,
> + tests[i].green, tests[i].blue);
> + }
> + }
> + }
> +
> + igt_fixture {
> + igt_display_fini(&data.display);
> + drm_close_driver(data.drm_fd);
> + }
> +}
> diff --git a/tests/meson.build b/tests/meson.build
> index 9736f2338507..06827b41a00c 100644
> --- a/tests/meson.build
> +++ b/tests/meson.build
> @@ -27,6 +27,7 @@ test_progs = [
> 'kms_color',
> 'kms_concurrent',
> 'kms_content_protection',
> + 'kms_crtc_background_color',
> 'kms_cursor_crc',
> 'kms_cursor_edge_walk',
> 'kms_cursor_legacy',
>
> ---
> base-commit: 862eb176244feac8ee711f381fe1be1fdc6a7ede
> change-id: 20251110-crtc-bgcolor-f6ed9a58e0bf
>
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