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

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Date:   Tue, 4 Dec 2018 12:25:41 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Marc Gonzalez <marc.w.gonzalez@...e.fr>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        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 Tue 04 Dec 06:37 PST 2018, Marc Gonzalez wrote:

> 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?
> 

The ufs clocks was updated because the ufs driver would fail to enable
them and by that fail. But I have yet to research what the appropriate
solution for this this particular clock is.

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

Right, so it seems to only be an annoyance for now. Let's revisit this.

Regards,
Bjorn

> [    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.