linux-kernel - Re: [PATCH v2] input: s6sy761: fix coordinate read bit shift

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Date:   Sat, 6 Mar 2021 12:33:59 +0200
From:   Andi Shyti <andi@...zian.org>
To:     Caleb Connolly <caleb@...nolly.tech>
Cc:     andi@...zian.org, Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh@...nel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] input: s6sy761: fix coordinate read bit shift

Hi Caleb,

On Fri, Mar 05, 2021 at 06:58:10PM +0000, Caleb Connolly wrote:
> The touch coordinate register contains the following:
> 
>         byte 3             byte 2             byte 1
> +--------+--------+ +-----------------+ +-----------------+
> |        |        | |                 | |                 |
> | X[3:0] | Y[3:0] | |     Y[11:4]     | |     X[11:4]     |
> |        |        | |                 | |                 |
> +--------+--------+ +-----------------+ +-----------------+
> 
> Bytes 2 and 1 need to be shifted left by 4 bits, the least significant
> nibble of each is stored in byte 3. Currently they are only
> being shifted by 3 causing the reported coordinates to be incorrect.
> 
> This matches downstream examples, and has been confirmed on my
> device (OnePlus 7 Pro).
> 
> Fixes: 0145a7141e59 ("Input: add support for the Samsung S6SY761
> touchscreen")
> Signed-off-by: Caleb Connolly <caleb@...nolly.tech>

Reviewed-by: Andi Shyti <andi@...zian.org>

Thanks,
Andi