Re: [PATCH v2 2/5] drm/rockchip: dw_hdmi_qp: Improve error handling with dev_err_probe()

[Cristian Ciocaltea <cristian.ciocaltea@collabora.com>]

On 10/9/25 12:41 PM, Laurent Pinchart wrote:
> On Thu, Oct 09, 2025 at 10:24:25AM +0300, Cristian Ciocaltea wrote:
>> On 10/6/25 7:26 PM, Laurent Pinchart wrote:
>>> On Mon, Oct 06, 2025 at 05:37:23PM +0300, Cristian Ciocaltea wrote:
>>>> On 10/6/25 3:02 PM, Dmitry Baryshkov wrote:
>>>>> On Mon, Oct 06, 2025 at 02:55:38AM +0300, Laurent Pinchart wrote:
>>>>>> From: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
>>>>>>
>>>>>> The error handling in dw_hdmi_qp_rockchip_bind() is quite inconsistent,
>>>>>> i.e. in some cases the error code is not included in the message, while
>>>>>> in some other cases there is no check for -EPROBE_DEFER.
>>>>>>
>>>>>> Since this is part of the probe path, address the aforementioned issues
>>>>>> by switching to dev_err_probe(), which also reduces the code a bit.
>>>>>>
>>>>>> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
>>>>>> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>>>>>> ---
>>>>>>  .../gpu/drm/rockchip/dw_hdmi_qp-rockchip.c    | 62 +++++++------------
>>>>>>  1 file changed, 24 insertions(+), 38 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
>>>>>> index 7d531b6f4c09..4e7794aa2dde 100644
>>>>>> --- a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
>>>>>> +++ b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
>>>>>> @@ -457,10 +457,8 @@ static int dw_hdmi_qp_rockchip_bind(struct device *dev, struct device *master,
>>>>>>  		return -ENODEV;
>>>>>>  
>>>>>>  	if (!cfg->ctrl_ops || !cfg->ctrl_ops->io_init ||
>>>>>> -	    !cfg->ctrl_ops->irq_callback || !cfg->ctrl_ops->hardirq_callback) {
>>>>>> -		dev_err(dev, "Missing platform ctrl ops\n");
>>>>>> -		return -ENODEV;
>>>>>> -	}
>>>>>> +	    !cfg->ctrl_ops->irq_callback || !cfg->ctrl_ops->hardirq_callback)
>>>>>> +		return dev_err_probe(dev, -ENODEV, "Missing platform ctrl ops\n");
>>>>>
>>>>> This only makes sense for the purpose of unification.
>>>>
>>>> Right, as mentioned in the commit description, the intention was to ensure
>>>> consistent error handling across the probe path rather than limiting the scope
>>>> to -EPROBE_DEFER exclusively.
>>>
>>> Should I revert this change in v3 or keep it ? I see value in
>>> unification, but I don't mind either way. Dmitry, what's your preference
>>> ?
>>
>> I missed to point out this patch has been also sent a while ago as part of
>> another series [1] which should be ready for merging.  It'd be great if there's
>> no need to revert any changes, otherwise we need to keep those in sync.
>>
>> Regardless, I'll let you know if that gets applied first, allowing us to drop
>> this one after rebasing.
> 
> Thanks for the information. I'm happy to merge 3/5 on top of that
> series. The DT binding change in 1/5 can be merged separately.

That series has been applied onto drm-misc-next.

>> [1] https://lore.kernel.org/all/20250903-rk3588-hdmi-cec-v4-3-fa25163c4b08@collabora.com/
>