From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Re: [PATCH 1/3] spi/qspi: Add memory mapped read support. Date: Tue, 15 Oct 2013 21:59:52 +0100 Message-ID: <20131015205952.GY2443@sirena.org.uk> References: <20131010101410.GG21581@sirena.org.uk> <52568AA3.9080203@ti.com> <20131011100839.GA21581@sirena.org.uk> <525CDB77.4040201@ti.com> <20131015111647.GX2443@sirena.org.uk> <525D2BB3.4020705@ti.com> <20131015124656.GM2443@sirena.org.uk> <525D41E2.30206@ti.com> <20131015180142.GS23337@ld-irv-0074.broadcom.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============6346167834533899520==" Cc: Peter Korsgaard , balbi@ti.com, "linux-mtd@lists.infradead.org" , "spi-devel-general@lists.sourceforge.net" , Sourav Poddar , Brian Norris , David Woodhouse To: Trent Piepho Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-mtd" Errors-To: linux-mtd-bounces+gldm-linux-mtd-36=gmane.org@lists.infradead.org List-Id: linux-spi.vger.kernel.org --===============6346167834533899520== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="aGDTCmeut6Neuydu" Content-Disposition: inline --aGDTCmeut6Neuydu Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Oct 15, 2013 at 11:13:38AM -0700, Trent Piepho wrote: > If it is, I think low latency for small reads is probably one of the > only advantages. To do that, you aren't going to want to deal with > device PM for every single read. It would make more sense to turn the > hardware on when the MTD device is opened and leave it on until > closed. Autosuspend *might* be efficient enough. --aGDTCmeut6Neuydu Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAEBAgAGBQJSXazFAAoJELSic+t+oim9q3sP/0/z3rGC+jhW9R8TmbOgA3xD 5dQUCpl5iqkGJtCejSMMh7FmWOiu0333ITPq0Gty7TZqj+f74ewTe2ehkvFxBmg3 NpYPUQIXElxqFOQlxpPnFYhPo0+OdJaXOR9f3ttHDkdopdCoYAqiflms0jxeZFAd wFfOqbMKilAdl68zAlUPCq1EMk5A5blNHX7FK5m+LBNlvGX7XSHf1QCU/D/vNDup 5bDpkZTr8K6AtCa7Mc50+zhqr08g2kD9UNsn1nI8fdUQ+UWse5LU9t98/TbesY3H ljoD1vBiJ0wMdYnmY0PWvScLeKFa3lxEoq3J1gRi5jBPTiYk4zF+Hp3oARPstuTO wHt6L9YIInl6YFIZK1GQeyn6IYaKbF+LSxQ9P1vQuo8cWkcHIVEdxNgsbnqCuhLt HJNUDjAaha9Cfx7gLwg4ICh3+3qj5BF0j7nQnEh9UYhhS8fmc6Ec9JqQGH0eDnYU qpLTQ/5gJlrBsNq1Ho6C2/+wbRTMjdMFGg+k9GZJQdF/8MtDxb4XJoAc228JeTKu 4Mob7bfpwsGHPoF87wMrF+kg+Dq3q8WHvnsDPxBEYeYTcuDaPYClNJqHenoM6ftJ /XmbGAN93p2Bvls3xn7lWjjFvsDU0ZOgry2oXLpETN+8E0CkspCpMdOAjucXgs7+ UYTQo5zP2++UH17Zd8zh =QbaT -----END PGP SIGNATURE----- --aGDTCmeut6Neuydu-- --===============6346167834533899520== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ --===============6346167834533899520==-- From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [2001:41c8:1:5384::2] (helo=cassiel.sirena.org.uk) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VWBj0-0005ir-Mt for linux-mtd@lists.infradead.org; Tue, 15 Oct 2013 21:00:19 +0000 Date: Tue, 15 Oct 2013 21:59:52 +0100 From: Mark Brown To: Trent Piepho Message-ID: <20131015205952.GY2443@sirena.org.uk> References: <20131010101410.GG21581@sirena.org.uk> <52568AA3.9080203@ti.com> <20131011100839.GA21581@sirena.org.uk> <525CDB77.4040201@ti.com> <20131015111647.GX2443@sirena.org.uk> <525D2BB3.4020705@ti.com> <20131015124656.GM2443@sirena.org.uk> <525D41E2.30206@ti.com> <20131015180142.GS23337@ld-irv-0074.broadcom.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="aGDTCmeut6Neuydu" Content-Disposition: inline In-Reply-To: Subject: Re: [PATCH 1/3] spi/qspi: Add memory mapped read support. Cc: Peter Korsgaard , balbi@ti.com, "linux-mtd@lists.infradead.org" , "spi-devel-general@lists.sourceforge.net" , Sourav Poddar , Brian Norris , David Woodhouse List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --aGDTCmeut6Neuydu Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Oct 15, 2013 at 11:13:38AM -0700, Trent Piepho wrote: > If it is, I think low latency for small reads is probably one of the > only advantages. To do that, you aren't going to want to deal with > device PM for every single read. It would make more sense to turn the > hardware on when the MTD device is opened and leave it on until > closed. Autosuspend *might* be efficient enough. --aGDTCmeut6Neuydu Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAEBAgAGBQJSXazFAAoJELSic+t+oim9q3sP/0/z3rGC+jhW9R8TmbOgA3xD 5dQUCpl5iqkGJtCejSMMh7FmWOiu0333ITPq0Gty7TZqj+f74ewTe2ehkvFxBmg3 NpYPUQIXElxqFOQlxpPnFYhPo0+OdJaXOR9f3ttHDkdopdCoYAqiflms0jxeZFAd wFfOqbMKilAdl68zAlUPCq1EMk5A5blNHX7FK5m+LBNlvGX7XSHf1QCU/D/vNDup 5bDpkZTr8K6AtCa7Mc50+zhqr08g2kD9UNsn1nI8fdUQ+UWse5LU9t98/TbesY3H ljoD1vBiJ0wMdYnmY0PWvScLeKFa3lxEoq3J1gRi5jBPTiYk4zF+Hp3oARPstuTO wHt6L9YIInl6YFIZK1GQeyn6IYaKbF+LSxQ9P1vQuo8cWkcHIVEdxNgsbnqCuhLt HJNUDjAaha9Cfx7gLwg4ICh3+3qj5BF0j7nQnEh9UYhhS8fmc6Ec9JqQGH0eDnYU qpLTQ/5gJlrBsNq1Ho6C2/+wbRTMjdMFGg+k9GZJQdF/8MtDxb4XJoAc228JeTKu 4Mob7bfpwsGHPoF87wMrF+kg+Dq3q8WHvnsDPxBEYeYTcuDaPYClNJqHenoM6ftJ /XmbGAN93p2Bvls3xn7lWjjFvsDU0ZOgry2oXLpETN+8E0CkspCpMdOAjucXgs7+ UYTQo5zP2++UH17Zd8zh =QbaT -----END PGP SIGNATURE----- --aGDTCmeut6Neuydu--