From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753041AbdKHU6C (ORCPT ); Wed, 8 Nov 2017 15:58:02 -0500 Received: from heliosphere.sirena.org.uk ([172.104.155.198]:43254 "EHLO heliosphere.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752948AbdKHU56 (ORCPT ); Wed, 8 Nov 2017 15:57:58 -0500 Date: Wed, 8 Nov 2017 20:57:52 +0000 From: Mark Brown To: "Levin, Alexander (Sasha Levin)" Cc: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , Jiada Wang Subject: Re: [PATCH AUTOSEL for-4.9 04/53] spi: imx: adjust watermark level according to transfer length Message-ID: <20171108205752.awsx5rzo4aecfl7i@sirena.co.uk> References: <20171108204940.27321-1-alexander.levin@verizon.com> <20171108204940.27321-4-alexander.levin@verizon.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="fktn7cpse6dqe7fq" Content-Disposition: inline In-Reply-To: <20171108204940.27321-4-alexander.levin@verizon.com> X-Cookie: Your mileage may vary. User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --fktn7cpse6dqe7fq Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Nov 08, 2017 at 08:49:55PM +0000, Levin, Alexander (Sasha Levin) wr= ote: > From: Jiada Wang >=20 > [ Upstream commit 66459c5a50a787c474b734b586328f7111ab6df0 ] >=20 > Previously DMA watermark level is configured to fifosize/2, > DMA mode can be used only when transfer length can be divided > by 'watermark level * bpw', which makes DMA mode not pratical. >=20 > This patch adjusts watermark level to largest number (no bigger > than fifosize/2) which can divide 'tranfer length / bpw' for > each transfer. This seems like an optimization not a bug fix... --fktn7cpse6dqe7fq Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAloDb88ACgkQJNaLcl1U h9CYPQf+K5d2RCDU/st0bAdey83rKRX2JbSJUuBIbYRTT5HA0WbpsN6FHLYEzNub dbsY0A3YhcmP4OdHfN/iXmTeVreS9MjgV+RUU/BGHZUm7bErRa9c8GYJfkyJK5Z0 OTnqK1X6sWz09ZkHoE3B/vnq5EufHuuXJnDmqVVyu/7/VYDGAyL0688Kks6HiXb5 SK75wb4ORZncVDD3ljO+iHVDWm2OmjsEIUD31zYxUiE5HSNXMTjFpn+rzSkWAYEQ XHUuO8aTR1hg7tGJJdlANQifWlPBsMip8LR8IMT4/ZdDjELbXwjzMLlg7Bo7dYDg s35ulVcgBSZJ0W/9bB+aoqlizPOxMQ== =2sXS -----END PGP SIGNATURE----- --fktn7cpse6dqe7fq--