linux-kernel - Re: [PATCH v1 1/6] phy: qcom-qmp: Fix phy pipe clock gating

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Date:   Fri, 21 Jul 2017 09:59:09 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Manu Gautam <mgautam@...eaurora.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Felipe Balbi <balbi@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        "open list:GENERIC PHY FRAMEWORK" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/6] phy: qcom-qmp: Fix phy pipe clock gating

On 07/21/2017 04:01 AM, Manu Gautam wrote:
> From: Vivek Gautam <vivek.gautam@...eaurora.org>
>
> Pipe clock comes out of the phy and is available as long as
> the phy is turned on. Clock controller fails to gate this
> clock after the phy is turned off and generates a warning.
>
> / # [   33.048561] gcc_usb3_phy_pipe_clk status stuck at 'on'
> [   33.048585] ------------[ cut here ]------------
> [   33.052621] WARNING: CPU: 1 PID: 18 at ../drivers/clk/qcom/clk-branch.c:97 clk_branch_wait+0xf0/0x108
> [   33.057384] Modules linked in:
> [   33.066497] CPU: 1 PID: 18 Comm: kworker/1:0 Tainted: G        W       4.12.0-rc7-00024-gfe926e34c36d-dirty #96
> [   33.069451] Hardware name: Qualcomm Technologies, Inc. DB820c (DT)
> ...
> [   33.278565] [<ffff00000849b27c>] clk_branch_wait+0xf0/0x108
> [   33.286375] [<ffff00000849b2f4>] clk_branch2_disable+0x28/0x34
> [   33.291761] [<ffff0000084868dc>] clk_core_disable+0x5c/0x88
> [   33.297660] [<ffff000008487d68>] clk_core_disable_lock+0x20/0x34
> [   33.303129] [<ffff000008487d98>] clk_disable+0x1c/0x24
> [   33.309384] [<ffff0000083ccd78>] qcom_qmp_phy_poweroff+0x20/0x48
> [   33.314328] [<ffff0000083c53f4>] phy_power_off+0x80/0xdc
> [   33.320492] [<ffff00000875c950>] dwc3_core_exit+0x94/0xa0
> [   33.325784] [<ffff00000875c9ac>] dwc3_suspend_common+0x50/0x60
> [   33.331080] [<ffff00000875ca04>] dwc3_runtime_suspend+0x48/0x6c
> [   33.336810] [<ffff0000085b82f4>] pm_generic_runtime_suspend+0x28/0x38
> [   33.342627] [<ffff0000085bace0>] __rpm_callback+0x150/0x254
> [   33.349222] [<ffff0000085bae08>] rpm_callback+0x24/0x78
> [   33.354604] [<ffff0000085b9fd8>] rpm_suspend+0xe0/0x4e4
> [   33.359813] [<ffff0000085bb784>] pm_runtime_work+0xdc/0xf0
> [   33.365028] [<ffff0000080d7b30>] process_one_work+0x12c/0x28c
> [   33.370576] [<ffff0000080d7ce8>] worker_thread+0x58/0x3b8
> [   33.376393] [<ffff0000080dd4a8>] kthread+0x100/0x12c
> [   33.381776] [<ffff0000080836c0>] ret_from_fork+0x10/0x50
>
> Fix this by enabling pipe clock at the end of phy_init(), and disabling
> it as the first thing in phy_exit().
>
> Fixes: e78f3d15e115 ("phy: qcom-qmp: new qmp phy driver for qcom-chipsets")
>
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>

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