linux-kernel - Re: [PATCH V5 3/6] drivers/auxdisplay: sensehat: Raspberry Pi Sense HAT display driver

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Date:   Sat, 11 Dec 2021 19:38:31 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Charles Mirabile <cmirabil@...hat.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Serge Schneider <serge@...pberrypi.org>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        Mattias Brugger <mbrugger@...e.com>,
        linux-rpi-kernel@...ts.infradead.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        fedora-rpi@...glegroups.com, Mwesigwa Guma <mguma@...hat.com>,
        Joel Savitz <jsavitz@...hat.com>
Subject: Re: [PATCH V5 3/6] drivers/auxdisplay: sensehat: Raspberry Pi Sense
 HAT display driver

Hi Charles, Mwesigwa, Joel, Serge,

On Fri, Dec 10, 2021 at 11:11 PM Charles Mirabile <cmirabil@...hat.com> wrote:
>
> Signed-off-by: Charles Mirabile <cmirabil@...hat.com>
> Co-developed-by: Mwesigwa Guma <mguma@...hat.com>
> Signed-off-by: Mwesigwa Guma <mguma@...hat.com>
> Co-developed-by: Joel Savitz <jsavitz@...hat.com>
> Signed-off-by: Joel Savitz <jsavitz@...hat.com>

The "submitting author" should be the last one, i.e.:

Co-developed-by: Mwesigwa Guma <mguma@...hat.com>
Signed-off-by: Mwesigwa Guma <mguma@...hat.com>
Co-developed-by: Joel Savitz <jsavitz@...hat.com>
Signed-off-by: Joel Savitz <jsavitz@...hat.com>
Signed-off-by: Charles Mirabile <cmirabil@...hat.com>

> +config SENSEHAT_DISPLAY
> +       tristate "Raspberry pi Sense HAT display driver"

pi -> Pi

> +static int sensehat_update_display(struct sensehat *sensehat);

Can the function be directly defined instead?

> +       if (*f_pos >= VMEM_SIZE)
> +               return 0;
> +       if (*f_pos + count > VMEM_SIZE)
> +               count = VMEM_SIZE - *f_pos;

`min` / `min_t`?

> +       if (ret < 0)
> +               dev_err(sensehat->dev,
> +                       "Update to 8x8 LED matrix display failed");

Could this happen a lot of times? Is it expected to happen under some
condition or should never happen?

Cheers,
Miguel