linux-kernel - Re: [PATCH v3 1/2] platform/x86: int3472: add hpd pin support

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Message-ID: <116ea6fa-e9b8-4c28-bc31-f4d1589eb34b@intel.com>
Date: Wed, 2 Jul 2025 18:23:19 +0800
From: "Yan, Dongcheng" <dongcheng.yan@...el.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: LKML <linux-kernel@...r.kernel.org>, linux-media@...r.kernel.org,
 sakari.ailus@...ux.intel.com, hverkuil@...all.nl,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Hans de Goede <hdegoede@...hat.com>, u.kleine-koenig@...libre.com,
 ricardo.ribalda@...il.com, bingbu.cao@...ux.intel.com,
 stable@...r.kernel.org, dongcheng.yan@...ux.intel.com, hao.yao@...el.com
Subject: Re: [PATCH v3 1/2] platform/x86: int3472: add hpd pin support

Hi Ilpo,

On 7/2/2025 6:19 PM, Ilpo Järvinen wrote:
> On Fri, 25 Apr 2025, Dongcheng Yan wrote:
> 
>> Typically HDMI to MIPI CSI-2 bridges have a pin to signal image data is
>> being received. On the host side this is wired to a GPIO for polling or
>> interrupts. This includes the Lontium HDMI to MIPI CSI-2 bridges
>> lt6911uxe and lt6911uxc.
>>
>> The GPIO "hpd" is used already by other HDMI to CSI-2 bridges, use it
>> here as well.
>>
>> Signed-off-by: Dongcheng Yan <dongcheng.yan@...el.com>
>> ---
>>  drivers/platform/x86/intel/int3472/common.h   | 1 +
>>  drivers/platform/x86/intel/int3472/discrete.c | 6 ++++++
>>  2 files changed, 7 insertions(+)
>>
>> diff --git a/drivers/platform/x86/intel/int3472/common.h b/drivers/platform/x86/intel/int3472/common.h
>> index 51b818e62a25..4593d567caf4 100644
>> --- a/drivers/platform/x86/intel/int3472/common.h
>> +++ b/drivers/platform/x86/intel/int3472/common.h
>> @@ -23,6 +23,7 @@
>>  #define INT3472_GPIO_TYPE_CLK_ENABLE				0x0c
>>  #define INT3472_GPIO_TYPE_PRIVACY_LED				0x0d
>>  #define INT3472_GPIO_TYPE_HANDSHAKE				0x12
>> +#define INT3472_GPIO_TYPE_HOTPLUG_DETECT			0x13
>>  
>>  #define INT3472_PDEV_MAX_NAME_LEN				23
>>  #define INT3472_MAX_SENSOR_GPIOS				3
>> diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
>> index 394975f55d64..efa3bc7af193 100644
>> --- a/drivers/platform/x86/intel/int3472/discrete.c
>> +++ b/drivers/platform/x86/intel/int3472/discrete.c
>> @@ -191,6 +191,10 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
>>  		*con_id = "privacy-led";
>>  		*gpio_flags = GPIO_ACTIVE_HIGH;
>>  		break;
>> +	case INT3472_GPIO_TYPE_HOTPLUG_DETECT:
>> +		*con_id = "hpd";
>> +		*gpio_flags = GPIO_ACTIVE_HIGH;
>> +		break;
>>  	case INT3472_GPIO_TYPE_POWER_ENABLE:
>>  		*con_id = "avdd";
>>  		*gpio_flags = GPIO_ACTIVE_HIGH;
>> @@ -221,6 +225,7 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
>>   * 0x0b Power enable
>>   * 0x0c Clock enable
>>   * 0x0d Privacy LED
>> + * 0x13 Hotplug detect
>>   *
>>   * There are some known platform specific quirks where that does not quite
>>   * hold up; for example where a pin with type 0x01 (Power down) is mapped to
>> @@ -290,6 +295,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
>>  	switch (type) {
>>  	case INT3472_GPIO_TYPE_RESET:
>>  	case INT3472_GPIO_TYPE_POWERDOWN:
>> +	case INT3472_GPIO_TYPE_HOTPLUG_DETECT:
>>  		ret = skl_int3472_map_gpio_to_sensor(int3472, agpio, con_id, gpio_flags);
>>  		if (ret)
>>  			err_msg = "Failed to map GPIO pin to sensor\n";
> 
> I was informed about existance of this patch through an off-band channel 
> (as I was not among receipients). In future, please include all relevant 
> maintainers and MLs as receipients as indicated by 
> scripts/get_maintainers.pl.
> 
> This may go through a media tree,
> 
> Acked-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> 
> 

Thanks a lot and sorry for the trouble caused by me.

Thanks,
Dongcheng