From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751785AbeDENRt (ORCPT ); Thu, 5 Apr 2018 09:17:49 -0400 Received: from heliosphere.sirena.org.uk ([172.104.155.198]:41496 "EHLO heliosphere.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751704AbeDENRq (ORCPT ); Thu, 5 Apr 2018 09:17:46 -0400 Date: Thu, 5 Apr 2018 14:17:35 +0100 From: Mark Brown To: Sergey Suloev Cc: Maxime Ripard , Chen-Yu Tsai , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org Subject: Re: [PATCH v3 3/6] spi: sun6i: restrict transfer length in PIO-mode Message-ID: <20180405131735.GB12349@sirena.org.uk> References: <20180403154449.2443-1-ssuloev@orpaltech.com> <20180403154449.2443-4-ssuloev@orpaltech.com> <20180404065048.n76r3ytuznd6fqsl@flea> <20180405091913.ky4dnmszoobn2xry@flea> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="v9Ux+11Zm5mwPlX6" Content-Disposition: inline In-Reply-To: X-Cookie: Last week's pet, this week's special. User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --v9Ux+11Zm5mwPlX6 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Apr 05, 2018 at 12:59:35PM +0300, Sergey Suloev wrote: > On 04/05/2018 12:19 PM, Maxime Ripard wrote: > > The point of that patch was precisely to allow to send more data than > > the FIFO. You're breaking that behaviour without any justification, > > and this is not ok. > I am sorry, but you can't. That's a hardware limitation. Are you positive about that? Normally you can add things to hardware FIFOs while they're being drained so so long as you can keep data flowing in at least as fast as it's being consumed. --v9Ux+11Zm5mwPlX6 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAlrGIe4ACgkQJNaLcl1U h9BmoAf/ahzcFkuIYLDWPJ6YcVmSo2FrEo9db3cgyBVAdYr5Mjc8tfXGcALZWqu6 gfPNrxkvZwpj7AB7XTFeVwr51tYriWPmAbRhBQ/jGH97hovKCQ1Etibg9Sazvdgi JMdB4P27ZkULOa9E7NFHdKGnf8FEPjhZX7/bXLeGBUII/R4BMQD2uE8DPpBeKtMl dtfk+gvwHf/n18H8kp9SQ8+BGaZ/jd5hjZcwS+ELHGfNkSe2dCgRt+l/jelx1xKd evkyGmpaQa/rWzFHqQcjuCPlinwKuoqH26vb/RCD1KDHgeefq/kHwWKzhid5FSfF QkT8QJXlGj+g2Q5NqwJ4+VbbR2pZsw== =0+Ns -----END PGP SIGNATURE----- --v9Ux+11Zm5mwPlX6--