From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Re: [PATCH v5] ASoC: add RT286 CODEC driver Date: Thu, 13 Mar 2014 20:43:23 +0000 Message-ID: <20140313204323.GM366@sirena.org.uk> References: <1394521896-27721-1-git-send-email-bardliao@realtek.com> <5320CE8C.8090608@metafoo.de> <53216DDC.9090502@metafoo.de> <20140313192902.GL366@sirena.org.uk> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2149227878079844805==" Return-path: Received: from mezzanine.sirena.org.uk (mezzanine.sirena.org.uk [106.187.55.193]) by alsa0.perex.cz (Postfix) with ESMTP id 839D826547E for ; Thu, 13 Mar 2014 21:43:37 +0100 (CET) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Takashi Iwai Cc: Oder Chiou , "alsa-devel@alsa-project.org" , Lars-Peter Clausen , "lgirdwood@gmail.com" , Bard Liao , Gustaw Lewandowski , Flove List-Id: alsa-devel@alsa-project.org --===============2149227878079844805== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="JjpRhe3EFs1LrwYV" Content-Disposition: inline --JjpRhe3EFs1LrwYV Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Mar 13, 2014 at 09:04:49PM +0100, Takashi Iwai wrote: > Mark Brown wrote: > > We don't really *need* the cache, it just makes it easier to do resume > > and gives a bit of a performance boost. > Well, the caching isn't just a bit. Without caching, you'd have to > whip the sound hardware powered up/down at each time querying the > current mixer value. Realistically most hardware can't actually do that - there's a couple of the idle_bias_off devices that have built in LDOs which can but it's relatively unusual to be able to remove enough power to loose register I/O (and in any case you wind up needing to cache the values per control or something in order to do system suspend). --JjpRhe3EFs1LrwYV Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAEBAgAGBQJTIhhoAAoJELSic+t+oim9DhEP/2wrfSviMG4kWfvUaT+fWaCX Q3C5WjKZuJpHX/AGWtHxQhHazD3zxYTy6Mt7w0AH0iwMJyzaNNnZrPRYd6pSOO0a gjBh0d0BfTrDokIYZhD4OcBU7l+jFmqbdOIoBxSVpZIa+dyFE1sfLRIuC+dcJ3aF u/uHqBr5Awa7WeB0MV5mR73vYtJLdiP9lAqd2Ji1JVYJobTQyCsQ+YGIFQwrwfP6 8JxgINzQg/TPtpFtJ0w0JQNaEtIUayiGG7HLjUMfSJr8sWyedgegO6YRXSQo+hqz XHnejE62/C7jnlhtwrymyp7M6z5aaLj8oYzHZSHU/Todz1BKJ1nGoSPUqEbhrzfH yifq87q9HS3UwgC+V+IABEPvKMabx4wQJc6UN6btn4ShBYdsbJ+jh3CO0nTQfIHM GXxVSlI3okOtyZcYvXVBk7hC/DMOSCY4ub5mKyon42/t9pT0rShLCnUzDRczyC21 n9peS1vuHmk/TibGT63/HkS7E8F44O58B4Hc70Y3Tb3HUNV4vMxtme1pOt1LFMrD CQi9e6mQwcyzAXmcLY4vmmDDLV7UnqYOcvbmqktRyAUuhEzUzu/si7MoErn+tBm2 A5PcVfeb8RW6LXyciec8vV9EbX/2uH+eReAI5Yy/H775q6c5yuou61Lc4H5wNI9w Z/kC7pt8bEMwHp/Y6LxV =w2Zv -----END PGP SIGNATURE----- --JjpRhe3EFs1LrwYV-- --===============2149227878079844805== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline --===============2149227878079844805==--