linux-kernel - Re: Synaptics RMI4 touchpad regression in 4.11-rc1

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Message-ID: <20170314195338.GA12169@bm.shmanahar.org>
Date:   Tue, 14 Mar 2017 19:53:38 +0000
From:   Nick Dyer <nick@...anahar.org>
To:     Cameron Gutman <aicommander@...il.com>
Cc:     Andrew Duggan <aduggan@...aptics.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        Jiri Kosina <jikos@...nel.org>, cheiny@...aptics.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Synaptics RMI4 touchpad regression in 4.11-rc1

On Mon, Mar 13, 2017 at 10:10:22PM -0700, Cameron Gutman wrote:
> >>>>> Compared to hid-multitouch, the RMI stack seems to have
> >>>>> completely broken palm rejection and introduced some random
> >>>>> jumpiness during fine pointing motions. I don't know if these
> >>>>> issues are caused by the above errors or are a separate issue.
> > 
> > The error about the bootloader version not being recognized just
> > means that updating the firmware is not supported on this touchpad.
> > It is only the F34 firmware update functionality which is failing to
> > load. The palm rejection and jumps are not related to this error.
> > 
> 
> Maybe that code path should be changed to not make as much noise when
> it runs on known unsupported hardware. Something like the attached
> patch?

> ---
> diff --git a/drivers/input/rmi4/rmi_f34v7.c b/drivers/input/rmi4/rmi_f34v7.c
> index 56c6c39..1291d9a 100644
> --- a/drivers/input/rmi4/rmi_f34v7.c
> +++ b/drivers/input/rmi4/rmi_f34v7.c
> @@ -1369,9 +1369,9 @@ int rmi_f34v7_probe(struct f34_data *f34)
>  	} else if (f34->bootloader_id[1] == 7) {
>  		f34->bl_version = 7;
>  	} else {
> -		dev_err(&f34->fn->dev, "%s: Unrecognized bootloader version\n",
> -				__func__);
> -		return -EINVAL;
> +		dev_info(&f34->fn->dev, "%s: Unsupported bootloader version: %u\n",
> +				__func__, f34->bootloader_id[1]);
> +		return -ENODEV;
>  	}
>  
>  	memset(&f34->v7.blkcount, 0x00, sizeof(f34->v7.blkcount));

I'm afraid I'm responsible for this. I agree it's very unlikely to be
related to your other issues.

One approach to suppress the extra output would be to turn off
CONFIG_RMI_F34. I think your proposed change in wording would be fine,
though.

cheers

Nick