rsnd: clk-multiplier already disabled warning on Ebisu

[Geert Uytterhoeven]

Hi Morimoto-san,

While booting Ebisu-4D, I saw the below warnings (once).

    rcar_sound ec500000.sound: can't use clk 1

rsnd_adg_clk_control() failed to enable CLKB, but continues.

    ------------[ cut here ]------------
    clk-multiplier already disabled
    WARNING: CPU: 1 PID: 52 at drivers/clk/clk.c:952 clk_core_disable+0x30/0x9c
    Modules linked in:
    CPU: 1 PID: 52 Comm: kworker/1:2 Not tainted
5.10.0-rc7-rcar3-initrd-00582-gadecf297acf4-dirty #183
    Hardware name: Renesas Ebisu-4D board based on r8a77990 (DT)
    Workqueue: events deferred_probe_work_func
    pstate: 60000085 (nZCv daIf -PAN -UAO -TCO BTYPE=--)
    pc : clk_core_disable+0x30/0x9c
    lr : clk_core_disable+0x30/0x9c
    sp : ffffffc010f939f0
    x29: ffffffc010f939f0 x28: 0000000000000000
    x27: ffffff800949eb00 x26: ffffff80093c40f8
    x25: 0000000000000001 x24: ffffffc010805fea
    x23: 0000000000000000 x22: ffffff80082b8810
    x21: ffffff80093c4080 x20: ffffff8009368b00
    x19: ffffff8009368b00 x18: 0000000000000000
    x17: 000000004ef774c4 x16: 0000000000000014
    x15: ffffffffffffffff x14: ffffffc010b8e8b0
    x13: fffffffffff9fd47 x12: 0720072007200720
    x11: fffffffffffc0000 x10: ffffffc010b8e8d8
    x9 : 0720072007200720 x8 : 2079646165726c61
    x7 : 0000000000000004 x6 : 00000000ffffe6ad
    x5 : ffffffc010f93718 x4 : 0000000000000000
    x3 : 0000000000000000 x2 : 00000000ffffffff
    x1 : 0000000000000000 x0 : 0000000000000000
    Call trace:
     clk_core_disable+0x30/0x9c
     clk_core_disable_lock+0x24/0x3c
     clk_disable+0x20/0x30
     rsnd_adg_clk_control+0xa0/0xd4
     rsnd_adg_remove+0x58/0x6c
     rsnd_probe+0x134/0x3cc

Something else fails (-EPROBE_DEFER?), and thus rsnd_adg_remove() is
called.  The latter disables all clocks, including the one that failed to
enable before, leading to the warning.

     platform_drv_probe+0x54/0xa4
     really_probe+0x234/0x340
     driver_probe_device+0xa0/0xb0
     __device_attach_driver+0x9c/0xa8
     bus_for_each_drv+0x9c/0xc4
     __device_attach+0xd4/0x140
     device_initial_probe+0x14/0x20
     bus_probe_device+0x30/0x94
     deferred_probe_work_func+0x9c/0xb0
     process_one_work+0x180/0x1f0
     process_scheduled_works+0x44/0x48
     worker_thread+0x1ec/0x270
     kthread+0xdc/0xec
     ret_from_fork+0x10/0x30
    ---[ end trace 8d8c2a1b7537ca36 ]---
    ------------[ cut here ]------------
    clk-multiplier already unprepared
    WARNING: CPU: 1 PID: 52 at drivers/clk/clk.c:810
clk_core_unprepare+0x30/0xd0
    [...]
    ---[ end trace 8d8c2a1b7537ca37 ]---

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds