linux-kernel - Re: [PATCH v2 1/3] clk: qcom: gcc-msm8998: Drop hmss_dvm and lpass

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Message-ID: <2f21e657-76f1-a05b-7861-11d7a5f1ea5d@free.fr>
Date:   Tue, 4 Dec 2018 15:37:43 +0100
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [PATCH v2 1/3] clk: qcom: gcc-msm8998: Drop hmss_dvm and lpass_at

On 03/12/2018 19:33, Bjorn Andersson wrote:

> Disabling gcc_hmss_dvm_bus_clk and gcc_lpass_at_clk causes the board to
> lock up, and by that preventing the kernel to boot without
> clk_ignore_unused.
> 
> gcc_hmss_dvm_bus_clk is marked always-on downstream, but not referenced,
> and gcc_lpass_at_clk isn't mentioned. So let's remove them until they
> are needed by some client.

Hello Bjorn,

What about gcc_gpu_bimc_gfx_clk?

AFAICT, it doesn't lock the system up, but the kernel warns:

[    2.171148] ------------[ cut here ]------------
[    2.173740] gcc_gpu_bimc_gfx_clk status stuck at 'on'
[    2.173996] WARNING: CPU: 3 PID: 1 at drivers/clk/qcom/clk-branch.c:92 clk_branch_toggle+0x190/0x1b0
[    2.183475] Modules linked in:
[    2.192554] CPU: 3 PID: 1 Comm: swapper/0 Tainted: G S                4.20.0-rc4 #23
[    2.195509] Hardware name: Qualcomm Technologies, Inc. MSM8998 v1 MTP (DT)
[    2.203389] pstate: 60000085 (nZCv daIf -PAN -UAO)
[    2.210016] pc : clk_branch_toggle+0x190/0x1b0
[    2.214781] lr : clk_branch_toggle+0x190/0x1b0
[    2.219213] sp : ffff00000807bcf0
[    2.223609] x29: ffff00000807bcf0 x28: 0000000000000008 
[    2.227041] x27: ffff0000089db070 x26: ffff000008961378 
[    2.232425] x25: ffff0000088da4b8 x24: 0000000000000000 
[    2.237721] x23: ffff000009138a08 x22: ffff000008414990 
[    2.243016] x21: 0000000000000000 x20: 0000000000000000 
[    2.248312] x19: ffff0000090e9000 x18: ffffffffffffffff 
[    2.253608] x17: 0000000000000000 x16: 0000000000000000 
[    2.258902] x15: ffff0000090e9648 x14: ffff000089193187 
[    2.264197] x13: ffff000009193195 x12: ffff0000090fb000 
[    2.269493] x11: ffff00000807bcf0 x10: ffff00000807bcf0 
[    2.274789] x9 : ffff00000807bcf0 x8 : 6e6f27207461206b 
[    2.280084] x7 : 6375747320737574 x6 : ffff000009192c89 
[    2.285380] x5 : 0000000000000000 x4 : 0000000000000000 
[    2.290676] x3 : ffffffffffffffff x2 : 00008000f5251000 
[    2.295971] x1 : e0dbf26541ede800 x0 : 0000000000000000 
[    2.301272] Call trace:
[    2.306491]  clk_branch_toggle+0x190/0x1b0
[    2.308705]  clk_branch2_disable+0x18/0x20
[    2.312890]  clk_disable_unused_subtree+0xc4/0xe0
[    2.316960]  clk_disable_unused+0x3c/0x130
[    2.321736]  do_one_initcall+0x5c/0x180
[    2.325745]  kernel_init_freeable+0x198/0x244
[    2.329469]  kernel_init+0x10/0x110
[    2.333942]  ret_from_fork+0x10/0x20
[    2.337257] ---[ end trace 57f62b628c127ef8 ]---


Regards.