Re: [PATCH] ARM: imx: Drop imx_anatop_init()
From: Leonard Crestez
Date: Thu Aug 22 2019 - 13:33:24 EST
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)
Minimal fix looks like this:
--- arch/arm/mach-imx/anatop.c
+++ arch/arm/mach-imx/anatop.c
@@ -111,6 +111,12 @@ void __init imx_init_revision_from_anatop(void)
digprog = readl_relaxed(anatop_base + offset);
iounmap(anatop_base);
+ anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
+ if (IS_ERR(anatop)) {
+ pr_err("failed to find imx6q-anatop regmap!\n");
+ return;
+ }
Since all SOCs that called imx_anatop_init also call
imx_init_revision_from_anatop this might be an acceptable solution,
unless there is some limitation preventing early regmap lookup.
--
Regards,
Leonard