linux-kernel - Re: [PATCH] drm/tegra: return with probe defer if GPIO subsystem is not ready

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Date:   Fri, 26 Jul 2019 16:23:12 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     thierry.reding@...il.com, airlied@...ux.ie
Cc:     jonathanh@...dia.com, dri-devel@...ts.freedesktop.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/tegra: return with probe defer if GPIO subsystem is
 not ready

Hi Thierry, Hi Dave,

On 2018-09-07 01:31, Stefan Agner wrote:
> On 26.07.2018 06:36, Stefan Agner wrote:
>> If the GPIO subsystem is not ready make sure to return -EPROBE_DEFER
>> instead of silently continuing without HPD.
>>
>> Reported-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
>> Signed-off-by: Stefan Agner <stefan@...er.ch>
> 
> I think this did not get merged yet, any chance to get it in?

Any chance to get this in in the next merge window?

--
Stefan

> 
> --
> Stefan
> 
>> ---
>>  drivers/gpu/drm/tegra/output.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c
>> index ffe34bd0bb9d..4bcefe455afd 100644
>> --- a/drivers/gpu/drm/tegra/output.c
>> +++ b/drivers/gpu/drm/tegra/output.c
>> @@ -133,7 +133,9 @@ int tegra_output_probe(struct tegra_output *output)
>>  	output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
>>  						   "nvidia,hpd-gpio", 0,
>>  						   &output->hpd_gpio_flags);
>> -	if (gpio_is_valid(output->hpd_gpio)) {
>> +	if (output->hpd_gpio == -EPROBE_DEFER) {
>> +		return -EPROBE_DEFER;
>> +	} else if (gpio_is_valid(output->hpd_gpio)) {
>>  		unsigned long flags;
>>
>>  		err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,