Re: [REGRESSION][BISECTED] Lenovo IdeaPad touchpad does not work when idma64 is present in initramfs

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Tue, Jan 20, 2026 at 11:56:15PM -0500, correctmost wrote:
> On Tue, Jan 20, 2026, at 4:33 AM, Andy Shevchenko wrote:
> > On Mon, Jan 19, 2026 at 12:49:59PM +0200, Andy Shevchenko wrote:
> >> On Mon, Jan 19, 2026 at 12:39:41PM +0200, Andy Shevchenko wrote:
> >> > On Fri, Jan 16, 2026 at 07:25:54PM -0500, correctmost wrote:

...

> >> > My understanding that the pin 3 on GPIO might be wrongly configured
> >> > by BIOS.  The difference with the original case is that your GPIO device
> >> > is locked against modifications and until you unlock it (usually
> >> > it's done in BIOS in some debug menu) it may not be fixable without OEM
> >> > fixing the issue themselves. In any case you can try the workaround
> >> > (see https://lore.kernel.org/all/ZftTcSA5dn13eAmr@smile.fi.intel.com/).
> >> > But I am skeptical about it.
> 
> I tested commit c03e9c42ae8 with the following patch and still saw the "probe
> with driver i2c_hid_acpi failed" error:

> +	{
> +		void __iomem *padcfg0;
> +	        u32 value;

> +		padcfg0 = intel_get_padcfg(pctrl, 3, PADCFG0);

I'm sorry to get you back to this one, but can you replace 3 with 82 and try
again (keep the kernel command options with HID debug enabled, etc, but no
other patches applied).

> +		guard(raw_spinlock_irqsave)(&pctrl->lock);
> +		value = readl(padcfg0);
> +		value |= PADCFG0_GPIOTXDIS;
> +		value |= PADCFG0_GPIORXDIS;
> +		writel(value, padcfg0);
> +	}
> +
>  	return 0;
>  }


-- 
With Best Regards,
Andy Shevchenko