linux-kernel - Re: [PATCH v12 2/4] Input: add core support for Goodix Berlin Touchscreen IC

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Date:   Mon, 11 Dec 2023 10:31:27 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bastien Nocera <hadess@...ess.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Henrik Rydberg <rydberg@...math.org>,
        Jeff LaBundy <jeff@...undy.com>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 2/4] Input: add core support for Goodix Berlin
 Touchscreen IC

Hi Dmitry,

On 10/12/2023 07:53, Dmitry Torokhov wrote:
> Hi Neil,
> 
> On Sat, Dec 09, 2023 at 08:33:40AM +0100, Neil Armstrong wrote:
>> Add initial support for the new Goodix "Berlin" touchscreen ICs.
>>
>> These touchscreen ICs support SPI, I2C and I3C interface, up to
>> 10 finger touch, stylus and gestures events.
>>
>> This initial driver is derived from the Goodix goodix_ts_berlin
>> available at [1] and [2] and only supports the GT9916 IC
>> present on the Qualcomm SM8550 MTP & QRD touch panel.
>>
>> The current implementation only supports BerlinD, aka GT9916.
>>
>> Support for advanced features like:
>> - Firmware & config update
>> - Stylus events
>> - Gestures events
>> - Previous revisions support (BerlinA or BerlinB)
>> is not included in current version.
>>
>> The current support will work with currently flashed firmware
>> and config, and bail out if firmware or config aren't flashed yet.
>>
>> [1] https://github.com/goodix/goodix_ts_berlin
>> [2] https://git.codelinaro.org/clo/la/platform/vendor/opensource/touch-drivers
>>
>> Reviewed-by: Jeff LaBundy <jeff@...undy.com>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> 
> Thank you for resending the patch. I think there is an issue in how you
> read and parse the data in case of more than 2 fingers. It looks like in
> that case you are overwriting the checksum form the first 2 and then not
> reading the new checksum but use some garbage past the touch data. I
> might be mistaken though...

Sure, let me check again to be sure it's not the case

> 
> I also believe you are leaking afe_data in case of success. We have the
> newfangled __free(kfree) from cleanup.h that should help there.

Indeed, it was added in the meantime, so let's switch to it

> 
> Another request - we should not have anything in goodix_berlin.h that is
> not used by the I2C and SPI sub-drivers, so the only thing it should
> contain is goodix_berlin_probe() declaration and dev_pm_ops. All other
> defines and definitions should go to goodix_berlin_core.h.
> 
> I made a few more cosmetic changes in the attached patch, please
> consider applying it.

Sure, I'll apply it, thanks for the suggestions,

Neil

> 
> Thanks.
>