Commits
guoyin.chen committed 7a2deeaebec
MA-10971 [8M-EVK]system cannot resume with mipi display In andorid UI framework, we will send DRM_MODE_DPMS_OFF to drm driver before we request kernel into suspend sate And send DRM_MODE_DPMS_ON after we resume kernel. mxsfb_resume should just recover the sate before kernel into suspend. Otherwise the mxsfb->connector is reset for DRM_MODE_DPMS_OFF, mxsfb drm driver have below kernel panic when resuming from suspend Unable to handle kernel NULL pointer dereference at virtual address 000000f4 pgd = ffff8000aa8ea000 [000000f4] *pgd=00000000ea8e9003, *pud=00000000ea4d6003, *pmd=0000000000000000 Internal error: Oops: 96000006 [#1] PREEMPT SMP Modules linked in: ath10k_pci ath10k_core ath CPU: 2 PID: 2693 Comm: system_server Not tainted 4.9.68-00922-g707b2da-dirty #35 Hardware name: Freescale i.MX8MQ EVK (DT) task: ffff8000b92d1b00 task.stack: ffff8000aad60000 PC is at mxsfb_crtc_enable+0xa4/0x538 LR is at mxsfb_crtc_enable+0x4dc/0x538 [<ffff00000871b5cc>] mxsfb_crtc_enable+0xa4/0x538 [<ffff00000871a6fc>] mxsfb_resume+0x68/0x84 [<ffff000008725f08>] platform_pm_resume+0x24/0x4c [<ffff00000873271c>] dpm_run_callback+0x40/0x1f0 [<ffff0000087336b0>] device_resume+0xac/0x284 [<ffff000008734bec>] dpm_resume+0x11c/0x374 [<ffff00000873526c>] dpm_resume_end+0x14/0x28 [<ffff00000811e558>] suspend_devices_and_enter+0x134/0x2f8 [<ffff00000811ead0>] pm_suspend+0x3b4/0x678 [<ffff00000811ceec>] state_store+0x80/0x9c [<ffff000008445068>] kobj_attr_store+0x14/0x24 [<ffff0000082c51d8>] sysfs_kf_write+0x40/0x50 [<ffff0000082c43e0>] kernfs_fop_write+0xb0/0x1e0 [<ffff000008242708>] vfs_write+0xac/0x1d0 [<ffff000008243be4>] SyS_write+0x50/0xb0 [<ffff000008082ef0>] el0_svc_naked+0x24/0x28 Change-Id: Ia2c4d0ef42e4a2761209fd678ace35804b40a387 Signed-off-by: guoyin.chen <guoyin.chen@nxp.com>