linux-kernel - Re: [PATCH v3 1/3] drm/v3d: Add support for V3D v4.2.

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Message-ID: <877ed99s1k.fsf@anholt.net>
Date:   Fri, 08 Mar 2019 09:47:51 -0800
From:   Eric Anholt <eric@...olt.net>
To:     Dave Emett <david.emett@...adcom.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Thomas Spurden <thomas.spurden@...adcom.com>
Subject: Re: [PATCH v3 1/3] drm/v3d: Add support for V3D v4.2.

Eric Anholt <eric@...olt.net> writes:

> [ Unknown signature status ]
> Dave Emett <david.emett@...adcom.com> writes:
>
>> Sorry, a few things I thought of after sending the Reviewed-by email...
>>
>>> +       v3d->reset = devm_reset_control_get_exclusive(dev, NULL);
>>> +       if (IS_ERR(v3d->reset)) {
>>> +               ret = PTR_ERR(v3d->reset);
>>> +
>>> +               if (ret == -EPROBE_DEFER)
>>> +                       goto dev_free;
>> Might be preferable to make this explicitly check against the
>> not-found error code (whatever that is)? As in if (not found)
>> <fallback to bridge> else <return error code>. Similarly...
>
> You won't have both a bridge and an external reset controller in the DT,
> so I'm not clear on what functional change you're looking for.  You're
> just concerned about what the return code from this function is?
> -EPROBE_DEFER is the only one that matters from a probe, really.
>
>>> +       if (platform_get_irq(v3d->pdev, 1) < 0) {
>> This should probably explicitly check for not-found rather than any
>> error. As-is, we might silently go down the single-interrupt-line path
>> on a platform with 2 interrupt lines if platform_get_irq(v3d->pdev, 1)
>> hits some other error.
>
> If I do the -EPROBE_DEFER check here, will that be good enough for you?
>
>>> +               ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 0),
>>> +                                      v3d_hub_irq, IRQF_SHARED,
>>> +                                      "v3d_hub", v3d);
>>> +               ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 1),
>>> +                                      v3d_irq, IRQF_SHARED,
>>> +                                      "v3d_core0", v3d);
>> Not introduced by this change, but return value from first
>> devm_request_irq ignored here?
>
> True, but let's handle separate bugs separately.

Resubmitted with the fix anyway.

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