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Message-ID: <202510270858.1GzE6iQg-lkp@intel.com>
Date: Mon, 27 Oct 2025 08:24:18 +0800
From: kernel test robot <lkp@...el.com>
To: LiangCheng Wang <zaq14760@...il.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Thomas Zimmermann <tzimmermann@...e.de>
Subject: drivers/gpu/drm/tiny/pixpaper.c:579:12: warning: stack frame size
(20024) exceeds limit (8192) in 'pixpaper_panel_hw_init'
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 4bb1f7e19c4a1d6eeb52b80acff5ac63edd1b91d
commit: c9e70639f5915f2d084a0126e62fe53a52c29cea drm: tiny: Add support for Mayqueen Pixpaper e-ink panel
date: 7 weeks ago
config: x86_64-randconfig-123-20251027 (https://download.01.org/0day-ci/archive/20251027/202510270858.1GzE6iQg-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251027/202510270858.1GzE6iQg-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510270858.1GzE6iQg-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/gpu/drm/tiny/pixpaper.c:579:12: warning: stack frame size (20024) exceeds limit (8192) in 'pixpaper_panel_hw_init' [-Wframe-larger-than]
579 | static int pixpaper_panel_hw_init(struct pixpaper_panel *panel)
| ^
1 warning generated.
vim +/pixpaper_panel_hw_init +579 drivers/gpu/drm/tiny/pixpaper.c
578
> 579 static int pixpaper_panel_hw_init(struct pixpaper_panel *panel)
580 {
581 struct pixpaper_error_ctx err = { .errno_code = 0 };
582
583 gpiod_set_value_cansleep(panel->reset, 0);
584 msleep(50);
585 gpiod_set_value_cansleep(panel->reset, 1);
586 msleep(50);
587
588 pixpaper_wait_for_panel(panel);
589
590 pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_4D, &err);
591 pixpaper_send_data(panel, PIXPAPER_UNKNOWN_4D_CONFIG, &err);
592 if (err.errno_code)
593 goto init_fail;
594 pixpaper_wait_for_panel(panel);
595
596 pixpaper_send_cmd(panel, PIXPAPER_CMD_PANEL_SETTING, &err);
597 pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG, &err);
598 pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG2, &err);
599 if (err.errno_code)
600 goto init_fail;
601 pixpaper_wait_for_panel(panel);
602
603 pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SETTING, &err);
604 pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG1, &err);
605 pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG2, &err);
606 pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err);
607 pixpaper_send_data(panel, PIXPAPER_PWR_VSPL_15V, &err);
608 pixpaper_send_data(panel, PIXPAPER_PWR_VSN_4V, &err);
609 pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err);
610 if (err.errno_code)
611 goto init_fail;
612 pixpaper_wait_for_panel(panel);
613
614 pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF_SEQUENCE, &err);
615 pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG1, &err);
616 pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG2, &err);
617 pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG3, &err);
618 if (err.errno_code)
619 goto init_fail;
620 pixpaper_wait_for_panel(panel);
621
622 pixpaper_send_cmd(panel, PIXPAPER_CMD_BOOSTER_SOFT_START, &err);
623 pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG1, &err);
624 pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG2, &err);
625 pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG3, &err);
626 pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG4, &err);
627 pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG5, &err);
628 pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG6, &err);
629 pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG7, &err);
630 if (err.errno_code)
631 goto init_fail;
632 pixpaper_wait_for_panel(panel);
633
634 pixpaper_send_cmd(panel, PIXPAPER_CMD_PLL_CONTROL, &err);
635 pixpaper_send_data(panel, PIXPAPER_PLL_CONFIG, &err);
636 if (err.errno_code)
637 goto init_fail;
638 pixpaper_wait_for_panel(panel);
639
640 pixpaper_send_cmd(panel, PIXPAPER_CMD_TEMP_SENSOR_CALIB, &err);
641 pixpaper_send_data(panel, PIXPAPER_TSE_CONFIG, &err);
642 if (err.errno_code)
643 goto init_fail;
644 pixpaper_wait_for_panel(panel);
645
646 pixpaper_send_cmd(panel, PIXPAPER_CMD_VCOM_INTERVAL, &err);
647 pixpaper_send_data(panel, PIXPAPER_CDI_CONFIG, &err);
648 if (err.errno_code)
649 goto init_fail;
650 pixpaper_wait_for_panel(panel);
651
652 pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_60, &err);
653 pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG1, &err);
654 pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG2, &err);
655 if (err.errno_code)
656 goto init_fail;
657 pixpaper_wait_for_panel(panel);
658
659 pixpaper_send_cmd(panel, PIXPAPER_CMD_RESOLUTION_SETTING, &err);
660 pixpaper_send_data(panel, PIXPAPER_TRES_HRES_H, &err);
661 pixpaper_send_data(panel, PIXPAPER_TRES_HRES_L, &err);
662 pixpaper_send_data(panel, PIXPAPER_TRES_VRES_H, &err);
663 pixpaper_send_data(panel, PIXPAPER_TRES_VRES_L, &err);
664 if (err.errno_code)
665 goto init_fail;
666 pixpaper_wait_for_panel(panel);
667
668 pixpaper_send_cmd(panel, PIXPAPER_CMD_GATE_SOURCE_START, &err);
669 pixpaper_send_data(panel, PIXPAPER_GSST_S_START, &err);
670 pixpaper_send_data(panel, PIXPAPER_GSST_RESERVED, &err);
671 pixpaper_send_data(panel, PIXPAPER_GSST_G_START_H, &err);
672 pixpaper_send_data(panel, PIXPAPER_GSST_G_START_L, &err);
673 if (err.errno_code)
674 goto init_fail;
675 pixpaper_wait_for_panel(panel);
676
677 pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E7, &err);
678 pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E7_CONFIG, &err);
679 if (err.errno_code)
680 goto init_fail;
681 pixpaper_wait_for_panel(panel);
682
683 pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SAVING, &err);
684 pixpaper_send_data(panel, PIXPAPER_PWS_CONFIG, &err);
685 if (err.errno_code)
686 goto init_fail;
687 pixpaper_wait_for_panel(panel);
688
689 pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E0, &err);
690 pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E0_CONFIG, &err);
691 if (err.errno_code)
692 goto init_fail;
693 pixpaper_wait_for_panel(panel);
694
695 pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B4, &err);
696 pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B4_CONFIG, &err);
697 if (err.errno_code)
698 goto init_fail;
699 pixpaper_wait_for_panel(panel);
700
701 pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B5, &err);
702 pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B5_CONFIG, &err);
703 if (err.errno_code)
704 goto init_fail;
705 pixpaper_wait_for_panel(panel);
706
707 pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E9, &err);
708 pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E9_CONFIG, &err);
709 if (err.errno_code)
710 goto init_fail;
711 pixpaper_wait_for_panel(panel);
712
713 return 0;
714
715 init_fail:
716 drm_err(&panel->drm, "Hardware initialization failed (err=%d)\n",
717 err.errno_code);
718 return err.errno_code;
719 }
720
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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