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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <7de3c5bf-8386-5d6e-bb64-2cf86a2bdede@amd.com>
Date:   Wed, 15 Feb 2023 02:54:59 +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 14/02/23 19:05, Pierre-Louis Bossart wrote:
>
>>>>  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.
> You probably want to explain what status_change_0to7 and
> status_change_8to11 actually control, it's not very intuitive for me to
> see device 1 interrupt being handled in status_change_8to11?
Peripheral device status interrupts on manager side will be read by reading
0to7 (for devices 1..7) and 8to11 (for devices 8 ..11) registers.
8to11 register will contain field for reading Soundwire wake enable status
for Soundwire manager instance.