Re: [PATCH] ARM: imx: Drop imx_anatop_init()

[Shawn Guo]

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!

Shawn