linux-kernel - Re: [PATCH V2 7/8] soundwire: amd: handle soundwire wake enable interrupt

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Message-ID: <586a9f58-f660-1ac0-0506-91362b25f75d@amd.com>
Date:   Tue, 14 Feb 2023 11:45:43 +0530
From:   "Mukunda,Vijendar" <vijendar.mukunda@....com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        vkoul@...nel.org
Cc:     amadeuszx.slawinski@...ux.intel.com, Mario.Limonciello@....com,
        Sunil-kumar.Dommati@....com, Basavaraj.Hiregoudar@....com,
        Mastan.Katragadda@....com, Arungopal.kondaveeti@....com,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        "moderated list:SOUNDWIRE SUBSYSTEM" <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 7/8] soundwire: amd: handle soundwire wake enable
 interrupt

On 13/02/23 23:54, Pierre-Louis Bossart wrote:
>
> On 2/13/23 03:40, Vijendar Mukunda wrote:
>> Add wake enable interrupt support for both the soundwire manager
>> instances.
>>
>> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
>> Signed-off-by: Mastan Katragadda <Mastan.Katragadda@....com>
>> ---
>>  drivers/soundwire/amd_manager.c | 10 ++++++++++
>>  drivers/soundwire/amd_manager.h |  1 +
>>  2 files changed, 11 insertions(+)
>>
>> diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
>> index eced189ba6e0..e53dc67f8529 100644
>> --- a/drivers/soundwire/amd_manager.c
>> +++ b/drivers/soundwire/amd_manager.c
>> @@ -934,6 +934,13 @@ static void amd_sdw_update_slave_status(u32 status_change_0to7, u32 status_chang
>>  	}
>>  }
>>  
>> +static void amd_sdw_process_wake_event(struct amd_sdw_manager *amd_manager)
>> +{
>> +	pm_request_resume(amd_manager->dev);
>> +	acp_reg_writel(0x00, amd_manager->acp_mmio + ACP_SW_WAKE_EN(amd_manager->instance));
>> +	acp_reg_writel(0x00, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_8TO11);
>> +}
>> +
>>  static void amd_sdw_irq_thread(struct work_struct *work)
>>  {
>>  	struct amd_sdw_manager *amd_manager =
>> @@ -945,6 +952,9 @@ static void amd_sdw_irq_thread(struct work_struct *work)
>>  	status_change_0to7 = acp_reg_readl(amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_0TO7);
>>  	dev_dbg(amd_manager->dev, "%s [SDW%d] SDW INT: 0to7=0x%x, 8to11=0x%x\n",
>>  		__func__, amd_manager->instance, status_change_0to7, status_change_8to11);
>> +	if (status_change_8to11 & AMD_SDW_WAKE_STAT_MASK)
>> +		return amd_sdw_process_wake_event(amd_manager);
>> +
> it's not clear what 8to11 might have to do with the wake enable?
>
> Can't you have a wake for devices 1..7?
It can wake any device from 1..11 .
SoundWire Wake interrupt status bit is part of 8to11 register.
>
>
>>  	if (status_change_8to11 & AMD_SDW_PREQ_INTR_STAT) {
>>  		amd_sdw_read_and_process_ping_status(amd_manager);
>>  	} else {
>> diff --git a/drivers/soundwire/amd_manager.h b/drivers/soundwire/amd_manager.h
>> index 6ec37612ae4e..86bc6d4f48bf 100644
>> --- a/drivers/soundwire/amd_manager.h
>> +++ b/drivers/soundwire/amd_manager.h
>> @@ -190,6 +190,7 @@
>>  #define AMD_SDW_CLK_STOP_DONE				1
>>  #define AMD_SDW_CLK_RESUME_REQ				2
>>  #define AMD_SDW_CLK_RESUME_DONE				3
>> +#define AMD_SDW_WAKE_STAT_MASK				BIT(16)
>>  
>>  enum amd_sdw_cmd_type {
>>  	AMD_SDW_CMD_PING = 0,