Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756648Ab3DWPPR (ORCPT ); Tue, 23 Apr 2013 11:15:17 -0400 Received: from opensource.wolfsonmicro.com ([80.75.67.52]:46516 "EHLO opensource.wolfsonmicro.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755929Ab3DWPPP (ORCPT ); Tue, 23 Apr 2013 11:15:15 -0400 Date: Tue, 23 Apr 2013 16:15:12 +0100 From: Mark Brown To: Girish K S Cc: spi-devel-general@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, grant.likely@secretlab.ca, t.figa@samsung.com Subject: Re: [PATCH 1/3] spi: s3c64xx: added support for polling mode Message-ID: <20130423151511.GR5019@opensource.wolfsonmicro.com> References: <1366614565-3743-1-git-send-email-ks.giri@samsung.com> <1366614565-3743-2-git-send-email-ks.giri@samsung.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="CPn8Wy5ME997YUMW" Content-Disposition: inline In-Reply-To: <1366614565-3743-2-git-send-email-ks.giri@samsung.com> X-Cookie: Caution: Keep out of reach of children. User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1804 Lines: 45 --CPn8Wy5ME997YUMW Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Apr 22, 2013 at 12:39:23PM +0530, Girish K S wrote: > From: Girish K S >=20 > The 64xx spi driver supports partial polling mode. > Only the last chunk of the transfer length is transferred > or recieved in polling mode. This appears to have a very noticable negative impact on SPI performance on my S3C6410 based system. Not delved into it to test why but are you sure it's not mistakenly selecting polling? --CPn8Wy5ME997YUMW Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJRdqU0AAoJELSic+t+oim9j0AP/2LSgiYibWqYsCJ2WrIZDmIT P41YOwSxixxvigSChfLHivoP8nUrhbXGjQDL+2ZWBV1dX+JA0YTOqsVCxRY/LCMR wa0PJJzL22AJ5cEd4LdEX5Ejwq2HJplTn1i6C0q2X0hy5zFxfR+wxXKwNCxy4t7w uqKAwBwC52wQSm1Q67ASzYmPufxsAaNj90ikeFvxVT8ggwXhRN5dECnNZl11hUcy w8E6DVEcNcVzj+gxJLxBpqzgki/iGemhp7FLGZ1/SdGV5QjGJyak3CxVbwb/dk/Y rNhASRAFaV7bWE4xj6CyNDhmjc6l/cCcsKwKs41hXBfsTtM1pVauBuknFfu1j1vE NinclKNCpiu3UrP/bU7HZWVzV+cIZVrqOFIgP+x/MP8WHJalLXi2U7hM3iZPnElH o8SMGp1t/PqAtd/sw7WnAsG7mQ1mH8WQZitReyluMKwxs2khBNORFDIHpgnvPJML Ek44rzsp6CEd1sqFRyhVW8VaOMPdofoYRG6sfP5yuDMj4/TgByaNnhmTLFr1rxnm EGtTaDOwAX2QIzgsl+Az0MHPqu/GEWzOm8xE1HMccD8wcSwyMaMHUttbCh1Qzj7k iHHgGyzocp45+DCGXkvERSovVrZ1q1Yr6hoqyr/bVB4+baNuSkTin+eYSXQyft0C i7ikPoMuPzUUy64qtrKT =EGxO -----END PGP SIGNATURE----- --CPn8Wy5ME997YUMW-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/