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0b1d72b40c
The power domain of the usb grf belongs to PD_USB on both RK3576 and RK3588 platforms. The PD_USB is managed by the USB controller driver, and it maybe powered down if USB is not working. Test on RK3576 EVB2 which supports Type-A USB3.1 + DP 2xLanes, connect DP to Display screen, meanwhile, USB not used, SError happens with the following log: [ 224.958079][ C0] Kernel panic - not syncing: Asynchronous SError Interrupt [ 224.958084][ C0] CPU: 0 PID: 132 Comm: kworker/0:2 Tainted: G O 6.1.57 #11 [ 224.958089][ C0] Hardware name: Rockchip RK3576 EVB2 V10 Android Board (DT) [ 224.958092][ C0] Workqueue: events dw_dp_hpd_work [ 224.958101][ C0] Call trace: [ 224.958103][ C0] dump_backtrace+0xf4/0x114 [ 224.958115][ C0] show_stack+0x18/0x24 [ 224.958122][ C0] dump_stack_lvl+0x6c/0x90 [ 224.958132][ C0] dump_stack+0x18/0x38 [ 224.958137][ C0] panic+0x14c/0x338 [ 224.958145][ C0] check_panic_on_warn+0x0/0x90 [ 224.958155][ C0] arm64_serror_panic+0x68/0x74 [ 224.958160][ C0] do_serror+0xc4/0xcc ... [ 224.958218][ C0] regmap_write+0x54/0x78 [ 224.958224][ C0] udphy_power_on+0x16c/0x1b0 [ 224.958233][ C0] rockchip_dp_phy_power_on+0x58/0x1bc [ 224.958240][ C0] phy_power_on+0x8c/0x108 [ 224.958248][ C0] dw_dp_bridge_detect+0x58/0x348 [ 224.958256][ C0] drm_bridge_detect+0x28/0x34 [ 224.958264][ C0] dw_dp_connector_detect+0x34/0x4c [ 224.958272][ C0] drm_helper_probe_detect+0xd0/0x1a0 [ 224.958281][ C0] check_connector_changed+0x50/0x1b0 [ 224.958288][ C0] drm_helper_hpd_irq_event+0x78/0x134 [ 224.958295][ C0] dw_dp_hpd_work+0x58/0x818 This patch moves udphy_u3_port_disable() from the udphy_power_on() to rockchip_u3phy_init(), it can avoid access usb grf during dp phy power on, and the rockchip_u3phy_init() is called from the USB controller driver, this can make sure the PD_USB is powered on if it access usb grf in the USBDP PHY driver. Change-Id: I434b2efbbbb5b513ec668bca1c8800d0f7f18e12 Signed-off-by: William Wu <william.wu@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.
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.