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ebfdd50335
when hdmi plug out or switch hdmi resolution, vop output timing maybe still at 4k resolution, but dclk will be set to 27M immediately, this will lead to one frame time change from 16.6ms to (594 / 27) * 16.6 = 365ms. drm will dump the following log, this looks uncomfortable, so we use rockchip_drm_atomic_helper_wait_for_vblanks to instead of drm_atomic_helper_wait_for_vblanks to cancel the dump log when mode update, and retain the debug warning log for every frame commit. [ 31.415329] ------------[ cut here ]------------ [ 31.415383] [CRTC:56:crtc-0] vblank wait timed out:1201:1201 [ 31.415498] WARNING: CPU: 2 PID: 366 at drivers/gpu/drm/drm_atomic_helper.c:1433 drm_atomic_helper_wait_for_vblanks.part.21+0x2c0/0x2d4 [ 31.415529] Modules linked in: [ 31.415573] CPU: 2 PID: 366 Comm: composer@2.1-se Tainted: G W 4.19.80 #1337 [ 31.415601] Hardware name: Rockchip RK3328 EVB avb (DT) [ 31.415633] pstate: 60400005 (nZCv daif +PAN -UAO) [ 31.415661] pc : drm_atomic_helper_wait_for_vblanks.part.21+0x2c0/0x2d4 [ 31.415696] lr : drm_atomic_helper_wait_for_vblanks.part.21+0x2c0/0x2d4 .... [ 31.423867] Call trace: [ 31.423904] drm_atomic_helper_wait_for_vblanks.part.21+0x2c0/0x2d4 [ 31.423939] drm_atomic_helper_wait_for_vblanks+0x1c/0x20 [ 31.423969] rockchip_atomic_commit_complete+0xb0/0x130 [ 31.423997] rockchip_drm_atomic_commit+0x1d4/0x230 [ 31.424032] drm_atomic_commit+0x50/0x68 [ 31.424067] drm_mode_atomic_ioctl+0xbe0/0xcb0 [ 31.424100] drm_ioctl_kernel+0xa0/0xe4 [ 31.424133] drm_ioctl+0x318/0x4a4 [ 31.424168] do_vfs_ioctl+0xbc/0xdb4 [ 31.424201] ksys_ioctl+0x78/0xa8 [ 31.424225] __arm64_sys_ioctl+0x1c/0x28 [ 31.424262] el0_svc_common.constprop.1+0xb4/0x168 [ 31.424288] el0_svc_handler+0x20/0x78 [ 31.424320] el0_svc+0x8/0x340 [ 31.424349] ---[ end trace af4d2af5b5fb7553 ]--- Change-Id: I5988882380fa91b7527999ac2cd5ae13cfc88a8b Signed-off-by: Sandy Huang <hjc@rock-chips.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.