linux-kernel - Re: [PATCH] ARM: imx: Drop imx_anatop

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Date:   Mon, 26 Aug 2019 11:08:33 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Leonard Crestez <leonard.crestez@....com>,
        Fabio Estevam <festevam@...il.com>,
        Chris Healy <cphealy@...il.com>,
        Peter Chen <peter.chen@....com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Aisheng Dong <aisheng.dong@....com>
Subject: Re: [PATCH] ARM: imx: Drop imx_anatop_init()

On Sat, Aug 24, 2019 at 11:31 AM Shawn Guo <shawnguo@...nel.org> wrote:
>
> On Thu, Aug 22, 2019 at 05:33:13PM +0000, Leonard Crestez wrote:
> > On 31.07.2019 21:01, Andrey Smirnov wrote:
> > > With commit b5bbe2235361 ("usb: phy: mxs: Disable external charger
> > > detect in mxs_phy_hw_init()") in tree all of the necessary charger
> > > setup is done by the USB PHY driver which covers all of the affected
> > > i.MX6 SoCs.
> > >
> > > NOTE: Imx_anatop_init() was also called for i.MX7D, but looking at its
> > > datasheet it appears to have a different USB PHY IP block, so
> > > executing i.MX6 charger disable configuration seems unnecessary.
> > >
> > > -void __init imx_anatop_init(void)
> > > -{
> > > -   anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
> > > -   if (IS_ERR(anatop)) {
> > > -           pr_err("%s: failed to find imx6q-anatop regmap!\n", __func__);
> > > -           return;
> > > -   }
> >
> > This patch breaks suspend on imx6 in linux-next because the "anatop"
> > regmap is no longer initialized. This was found via bisect but
> > no_console_suspend prints a helpful stack anyway:
> >
> > (regmap_read) from [<c01226e4>] (imx_anatop_enable_weak2p5+0x28/0x70)
> > (imx_anatop_enable_weak2p5) from [<c0122744>]
> > (imx_anatop_pre_suspend+0x18/0x64)
> > (imx_anatop_pre_suspend) from [<c0124434>] (imx6q_pm_enter+0x60/0x16c)
> > (imx6q_pm_enter) from [<c018c8a4>] (suspend_devices_and_enter+0x7d4/0xcbc)
> > (suspend_devices_and_enter) from [<c018d544>] (pm_suspend+0x7b8/0x904)
> > (pm_suspend) from [<c018b1b4>] (state_store+0x68/0xc8)
>
> I dropped it from my branch for now.  Thanks for reporting!
>

OK, it sounds like I can submit a v2 that only removes
imx_anatop_usb_chrg_detect_disable() and keeps imx_anatop_init()
intact.

Thanks,
Andrey Smirnov