linux-kernel - Re: [PATCH v2 1/2] platform/x86: int3472: add hpd pin support

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Message-ID: <5bdda33f-be94-480c-8b2b-6afd3036f9ee@linux.intel.com>
Date: Fri, 25 Apr 2025 18:45:25 +0800
From: "Yan, Dongcheng" <dongcheng.yan@...ux.intel.com>
To: Hans de Goede <hdegoede@...hat.com>,
 Dongcheng Yan <dongcheng.yan@...el.com>, linux-kernel@...r.kernel.org,
 linux-media@...r.kernel.org, sakari.ailus@...ux.intel.com,
 hverkuil@...all.nl, andriy.shevchenko@...ux.intel.com,
 u.kleine-koenig@...libre.com, ricardo.ribalda@...il.com,
 bingbu.cao@...ux.intel.com
Cc: stable@...r.kernel.org, hao.yao@...el.com,
 "Zou, Xiaohong" <xiaohong.zou@...el.com>
Subject: Re: [PATCH v2 1/2] platform/x86: int3472: add hpd pin support

Hi hans,

thanks for your review, I have updated v3 within rebasing to
review-ilpo-next.

On 4/25/2025 6:13 PM, Hans de Goede wrote:
> Hi Doncheng,
> 
> On 25-Apr-25 12:07 PM, 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>
> 
> Thanks, patch looks good to me:
> 
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> 
> Note my handshake control series has just landed / is on its
> way to next, see:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-ilpo-next
> 
> Please send a v3 rebased on top of this to resolve the conflict
> we now have.
> 
> Regards,
> 
> Hans
> 
> 
> 
> 
> 
> 
>> ---
>>  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 145dec66df64..db4cd3720e24 100644
>> --- a/drivers/platform/x86/intel/int3472/common.h
>> +++ b/drivers/platform/x86/intel/int3472/common.h
>> @@ -22,6 +22,7 @@
>>  #define INT3472_GPIO_TYPE_POWER_ENABLE				0x0b
>>  #define INT3472_GPIO_TYPE_CLK_ENABLE				0x0c
>>  #define INT3472_GPIO_TYPE_PRIVACY_LED				0x0d
>> +#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 30ff8f3ea1f5..26215d1b63a2 100644
>> --- a/drivers/platform/x86/intel/int3472/discrete.c
>> +++ b/drivers/platform/x86/intel/int3472/discrete.c
>> @@ -186,6 +186,10 @@ static void int3472_get_con_id_and_polarity(struct acpi_device *adev, u8 *type,
>>  		*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 = "power-enable";
>>  		*gpio_flags = GPIO_ACTIVE_HIGH;
>> @@ -212,6 +216,7 @@ static void int3472_get_con_id_and_polarity(struct acpi_device *adev, u8 *type,
>>   * 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
>> @@ -281,6 +286,7 @@ 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";
>>
>> base-commit: 01c6df60d5d4ae00cd5c1648818744838bba7763
>