From: "Péter Ujfalusi" <peter.ujfalusi@linux.intel.com>
To: Jaroslav Kysela <perex@perex.cz>,
lgirdwood@gmail.com, broonie@kernel.org, tiwai@suse.de
Cc: linux-sound@vger.kernel.org,
pierre-louis.bossart@linux.intel.com,
kai.vehmanen@linux.intel.com, yung-chuan.liao@linux.intel.com,
liam.r.girdwood@intel.com, ranjani.sridharan@linux.intel.com
Subject: Re: [PATCH 0/5] ALSA: hda / ASoC: SOF: Add support for PIO command mode
Date: Wed, 10 Apr 2024 11:56:01 +0300 [thread overview]
Message-ID: <61fd0ebb-fe75-460a-a85c-e7c346be6113@linux.intel.com> (raw)
In-Reply-To: <1a9b4e05-9314-432b-a52e-133b0e5719c7@perex.cz>
Hi Jaroslav,
On 09/04/2024 11:53, Jaroslav Kysela wrote:
> On 09. 04. 24 10:38, Peter Ujfalusi wrote:
>> Hi,
>>
>> This series will introduce support for using PIO for commands (immediate
>> commands) instead of CORB while retaining the use of RIRB for unsolicited
>> responses (notifications).
>
> Hi,
>
> Could you elaborate, how this affects CPU usage (busy loops for I/O)? Do
> the bus read operation wait until the data transfer on bus is finished?
>
>> This mode of operation is the recommended one for Lunar Lake family.
>
> A bit more explanation, please. It looks like a step back.
LunarLake is a different architecture compared to previous solutions, so
some things are improved with e.g. all audio interfaces using the
HDaudio DMA, and others are done differently (commands, wakes, etc).
In practice, we have not found any cases where performance would be
significantly impacted by the use of PIO v. DMA. The number of 'verbs'
sent is usually fairly limited.
The major concern we had initially was firmware download for Cirrus/TI
amps behind an HDaudio bridge, but all of those solutions rely on a side
I2C/SPI bus so the firmware does not rely on the HDaudio commands.
Hope this answers to your questions
--
Péter
next prev parent reply other threads:[~2024-04-10 8:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-09 8:38 [PATCH 0/5] ALSA: hda / ASoC: SOF: Add support for PIO command mode Peter Ujfalusi
2024-04-09 8:38 ` [PATCH 1/5] ALSA: hda: Introduce flags to force commands via PIO instead of CORB Peter Ujfalusi
2024-04-09 8:38 ` [PATCH 2/5] ALSA: hda: hdac_controller: Implement support for use_pio_for_commands mode Peter Ujfalusi
2024-04-09 8:38 ` [PATCH 3/5] ALSA: pci: hda: hda_controller: Add " Peter Ujfalusi
2024-04-09 8:38 ` [PATCH 4/5] ALSA: hda: Intel: Select AZX_DCAPS_PIO_COMMANDS for Lunar Lake Peter Ujfalusi
2024-04-09 8:38 ` [PATCH 5/5] ASoC: SOF: Intel: hda-bus: Use PIO mode " Peter Ujfalusi
2024-04-09 11:56 ` Mark Brown
2024-04-09 8:53 ` [PATCH 0/5] ALSA: hda / ASoC: SOF: Add support for PIO command mode Jaroslav Kysela
2024-04-10 8:56 ` Péter Ujfalusi [this message]
2024-04-18 6:39 ` Takashi Iwai
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