From: Vinod Koul <vinod.koul@intel.com>
To: "Subhransu S. Prusty" <subhransu.s.prusty@intel.com>
Cc: alsa-devel@alsa-project.org, tiwai@suse.de, lgirdwood@gmail.com,
Ramesh Babu <ramesh.babu@intel.com>,
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
patches.audio@intel.com, broonie@kernel.org
Subject: Re: [PATCH v3] ALSA: core: let low-level driver or userspace disable rewinds
Date: Mon, 19 Jun 2017 13:33:47 +0530 [thread overview]
Message-ID: <20170619080347.GI19154@localhost> (raw)
In-Reply-To: <1497853357-2931-1-git-send-email-subhransu.s.prusty@intel.com>
On Mon, Jun 19, 2017 at 11:52:37AM +0530, Subhransu S. Prusty wrote:
> From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
>
> Add new hw_params flag to explicitly tell driver that rewinds will never
> be used. This can be used by low-level driver to optimize DMA operations
> and reduce power consumption. Use this flag only when data written in
> ring buffer will never be invalidated, e.g. any update of appl_ptr is
> final.
>
> Note that the update of appl_ptr include both a read/write data
> operation as well as snd_pcm_forward() whose behavior is not modified.
Reviewed-By: Vinod Koul <vinod.koul@intel.com>
--
~Vinod
next prev parent reply other threads:[~2017-06-19 8:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-19 6:22 [PATCH v3] ALSA: core: let low-level driver or userspace disable rewinds Subhransu S. Prusty
2017-06-19 8:03 ` Vinod Koul [this message]
2017-06-19 8:44 ` Takashi Iwai
2017-06-19 15:16 ` Pierre-Louis Bossart
2017-06-19 15:25 ` Takashi Iwai
2017-06-19 15:38 ` Pierre-Louis Bossart
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