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After the kernel 4.4, the DRM disable flow was changed, if DPI was disableed before CRTC, it will cause warning message as following: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1339 at ../../linux/linux-4.4.24-mtk/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x188/0x18c() vblank wait timed out on crtc 0 Modules linked in: bridge mt8521p_ir_shim(O) i2c_eeprom(O) mtk_m4(O) fuse_ctrl(O) virtual_block(O) caamkeys(PO) chk(PO) amperctl(O) ledctl(O) apple_auth(PO) micctl(O) sensors(PO) lla(O) sdd(PO) ice40_fpga(O) psmon(O) event_queue(PO) utils(O) blackbox(O) CPU: 0 PID: 1339 Comm: kworker/0:1 Tainted: P W O 4.4.24 #1 Hardware name: Mediatek Cortex-A7 (Device Tree) Workqueue: events drm_mode_rmfb_work_fn [<c001a710>] (unwind_backtrace) from [<c00151e4>] (show_stack+0x20/0x24) [<c00151e4>] (show_stack) from [<c027961c>] (dump_stack+0x98/0xac) [<c027961c>] (dump_stack) from [<c002ac54>] (warn_slowpath_common+0x94/0xc4) [<c002ac54>] (warn_slowpath_common) from [<c002acc4>] (warn_slowpath_fmt+0x40/0x48) [<c002acc4>] (warn_slowpath_fmt) from [<c03307ac>] (drm_wait_one_vblank+0x188/0x18c) [<c03307ac>] (drm_wait_one_vblank) from [<c03307d8>] (drm_crtc_wait_one_vblank+0x28/0x2c) [<c03307d8>] (drm_crtc_wait_one_vblank) from [<c034f48c>] (mtk_drm_crtc_disable+0x78/0x240) [<c034f48c>] (mtk_drm_crtc_disable) from [<c03240d4>] (drm_atomic_helper_commit_modeset_disables+0x128/0x3b8) [<c03240d4>] (drm_atomic_helper_commit_modeset_disables) from [<c0350a7c>] (mtk_atomic_complete+0x74/0xb4) [<c0350a7c>] (mtk_atomic_complete) from [<c0350b24>] (mtk_atomic_commit+0x68/0x98) [<c0350b24>] (mtk_atomic_commit) from [<c034ab48>] (drm_atomic_commit+0x54/0x74) [<c034ab48>] (drm_atomic_commit) from [<c0325c4c>] (drm_atomic_helper_set_config+0x7c/0xa0) [<c0325c4c>] (drm_atomic_helper_set_config) from [<c0338594>] (drm_mode_set_config_internal+0x68/0xe4) [<c0338594>] (drm_mode_set_config_internal) from [<c033967c>] (drm_framebuffer_remove+0xe4/0x120) [<c033967c>] (drm_framebuffer_remove) from [<c0339700>] (drm_mode_rmfb_work_fn+0x48/0x58) [<c0339700>] (drm_mode_rmfb_work_fn) from [<c0043a38>] (process_one_work+0x154/0x50c) [<c0043a38>] (process_one_work) from [<c0044074>] (worker_thread+0x284/0x568) [<c0044074>] (worker_thread) from [<c0049dc4>] (kthread+0xec/0x104) [<c0049dc4>] (kthread) from [<c0010678>] (ret_from_fork+0x14/0x3c) ---[ end trace 12ae5358e992abd5 ]--- so, we add refcount for DPI power on/off to protect the flow. Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com> Signed-off-by: chunhui dai <chunhui.dai@mediatek.com> Signed-off-by: CK Hu <ck.hu@mediatek.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.