linux-kernel - Re: [Sound-open-firmware] [PATCH 3/4] ASoC: SOF: Adding amd HS functionality to the sof core

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Date:   Thu, 17 Nov 2022 10:05:04 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        V sujith kumar Reddy <Vsujithkumar.Reddy@....com>,
        broonie@...nel.org, alsa-devel@...a-project.org
Cc:     Daniel Baluta <daniel.baluta@....com>, Sunil-kumar.Dommati@....com,
        ssabakar@....com, Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        venkataprasad.potturu@....com,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Basavaraj.Hiregoudar@....com, Chen-Yu Tsai <wenst@...omium.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        YC Hung <yc.hung@...iatek.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Vijendar.Mukunda@....com,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ajit Kumar Pandey <AjitKumar.Pandey@....com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:SOUND - SOUND OPEN FIRMWARE (SOF) DRIVERS" 
        <sound-open-firmware@...a-project.org>
Subject: Re: [Sound-open-firmware] [PATCH 3/4] ASoC: SOF: Adding amd HS
 functionality to the sof core

Il 16/11/22 17:55, Pierre-Louis Bossart ha scritto:
> 
> 
> On 11/16/22 10:33, AngeloGioacchino Del Regno wrote:
>> Il 16/11/22 16:04, Pierre-Louis Bossart ha scritto:
>>>
>>>>> diff --git a/include/sound/sof/dai.h b/include/sound/sof/dai.h
>>>>> index 21d98f31a9ca..83fd81c82e4c 100644
>>>>> --- a/include/sound/sof/dai.h
>>>>> +++ b/include/sound/sof/dai.h
>>>>> @@ -84,6 +84,7 @@ enum sof_ipc_dai_type {
>>>>>         SOF_DAI_AMD_BT,            /**< AMD ACP BT*/
>>>>>         SOF_DAI_AMD_SP,            /**< AMD ACP SP */
>>>>>         SOF_DAI_AMD_DMIC,        /**< AMD ACP DMIC */
>>>>> +    SOF_DAI_AMD_HS,            /**< Amd HS */
>>>>>         SOF_DAI_MEDIATEK_AFE,        /**< Mediatek AFE */
>>>>
>>>> Adding SOF_DAI_AMD_HS before SOF_DAI_MEDIATEK_AFE desynced this
>>>> enumeration
>>>> so the DAI type is now 11 and not 10 anymore, leading to a failure in
>>>> firmware
>>>> at IPC3 helper function `dai_get()`, as when `dai_find_type()` is
>>>> called, the
>>>> DAI type that the firmware expects doesn't match with the one that gets
>>>> sent
>>>> in the request message from the kernel.
>>>>
>>>> As a local test, I tried moving SOF_DAI_AMD_HS after
>>>> SOF_DAI_MEDIATEK_AFE and
>>>> this has restored full functionality on my MT8195 platform (Tomato
>>>> Chromebook).
>>>>
>>>> If SOF is supposed to guarantee backwards compatibility (and I believe
>>>> it is),
>>>> this commit breaks that.
>>>>
>>>> I would be tempted to send a commit that moves SOF_DAI_AMD_HS to the
>>>> end, but
>>>> that would break the already compiled firmware for AMD platforms, so I
>>>> am not
>>>> sure how to proceed.
>>>
>>> D'oh. Yes this breaks backwards-compatibility and this is a clear
>>> mistake. I think your suggestion to add the AMD_HS at the end is the
>>> only practical solution indeed - this would need to be done for both
>>> kernel and SOF version of dai.h.
>>>
>>
>> Okay, I will send a commit tomorrow :-)
> 
> I sent those two GitHub pull requests already:
> 
> https://github.com/thesofproject/linux/pull/4017
> https://github.com/thesofproject/sof/pull/6616
> 

Thanks for the fast action.

Regards,
Angelo