linux-kernel - Re: [PATCH RESEND] firmware: imx: SCU irq should ONLY be enabled after SCU IPC is ready

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Date:   Fri, 17 May 2019 10:43:49 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Anson Huang <anson.huang@....com>
Cc:     "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        Aisheng Dong <aisheng.dong@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH RESEND] firmware: imx: SCU irq should ONLY be enabled
 after SCU IPC is ready

On Sun, May 12, 2019 at 08:38:22AM +0000, Anson Huang wrote:
> The imx_scu_irq_group_enable() is normally called during module driver
> probe phase to enable SCU group irq, if SCU IPC is NOT ready, below
> dump will show out:
> 
> [    0.933001] Hardware name: Freescale i.MX8QXP MEK (DT)
> [    0.938129] pstate: 60000005 (nZCv daif -PAN -UAO)
> [    0.942907] pc : imx_scu_call_rpc+0x114/0x158
> [    0.947251] lr : imx_scu_irq_group_enable+0x74/0xc4
> [    0.952113] sp : ffff00001005bae0
> [    0.955415] x29: ffff00001005bae0 x28: ffff0000111bb0a0
> [    0.960712] x27: ffff00001140b000 x26: ffff00001111068c
> [    0.966011] x25: ffff0000111bb100 x24: 0000000000000000
> [    0.971311] x23: ffff0000113d9cd8 x22: 0000000000000001
> [    0.976610] x21: 0000000000000001 x20: ffff80083b51a410
> [    0.981909] x19: ffff000011259000 x18: 0000000000000480
> [    0.987209] x17: 000000000023ffb8 x16: 0000000000000010
> [    0.992508] x15: 000000000000023f x14: ffffffffffffffff
> [    0.997807] x13: 0000000000000018 x12: 0000000000000030
> [    1.003107] x11: 0000000000000003 x10: 0101010101010101
> [    1.008406] x9 : ffffffffffffffff x8 : 7f7f7f7f7f7f7f7f
> [    1.013706] x7 : fefefeff646c606d x6 : 0000000000000000
> [    1.019005] x5 : ffff0000112596c8 x4 : 0000000000000008
> [    1.024304] x3 : 0000000000000003 x2 : 0000000000000001
> [    1.029604] x1 : ffff00001005bb58 x0 : 0000000000000000
> [    1.034905] Call trace:
> [    1.037341]  imx_scu_call_rpc+0x114/0x158
> [    1.041334]  imx_scu_irq_group_enable+0x74/0xc4
> [    1.045856]  imx_sc_wdt_probe+0x24/0x150
> [    1.049766]  platform_drv_probe+0x4c/0xb0
> [    1.053762]  really_probe+0x1f8/0x2c8
> [    1.057407]  driver_probe_device+0x58/0xfc
> [    1.061490]  device_driver_attach+0x68/0x70
> [    1.065660]  __driver_attach+0x94/0xdc
> [    1.069397]  bus_for_each_dev+0x64/0xc0
> [    1.073220]  driver_attach+0x20/0x28
> [    1.076782]  bus_add_driver+0x148/0x1fc
> [    1.080601]  driver_register+0x68/0x120
> [    1.084424]  __platform_driver_register+0x4c/0x54
> [    1.089120]  imx_sc_wdt_driver_init+0x18/0x20
> [    1.093463]  do_one_initcall+0x58/0x1b8
> [    1.097287]  kernel_init_freeable+0x1cc/0x288
> [    1.101630]  kernel_init+0x10/0x100
> [    1.105101]  ret_from_fork+0x10/0x18
> [    1.108669] ---[ end trace 9e03302114457de9 ]---
> [    1.113296] enable irq failed, group 1, mask 1, ret -22
> 
> To avoid such scenario, return -EPROBE_DEFER in imx_scu_irq_group_enable()
> API if SCU IPC is NOT ready, then module driver which calls this API
> in probe phase will defer probe after SCU IPC ready.
> 
> Fixes: 851826c7566e ("firmware: imx: enable imx scu general irq function")
> Signed-off-by: Anson Huang <Anson.Huang@....com>

Applied, thanks.