From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Echtler Subject: Re: [PATCH] add raw video support for Samsung SUR40 touchscreen Date: Wed, 04 Feb 2015 11:08:17 +0100 Message-ID: <54D1EF91.8070805@butterbrot.org> References: <1420626920-9357-1-git-send-email-floe@butterbrot.org> <64652239.MTTlcOgNK2@avalon> <54BE5204.3020600@xs4all.nl> <6025823.veVKIskIW2@avalon> <54BFA989.4090405@butterbrot.org> <54BFA9D6.1040201@xs4all.nl> <54CAA786.2040908@butterbrot.org> <54D13383.7010603@butterbrot.org> <54D1D37C.20701@xs4all.nl> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="LtoVp3brI7i091GdNUFhQkAfMoOVB2dJ3" Return-path: Received: from butterbrot.org ([176.9.106.16]:46987 "EHLO butterbrot.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752060AbbBDKIT (ORCPT ); Wed, 4 Feb 2015 05:08:19 -0500 In-Reply-To: <54D1D37C.20701@xs4all.nl> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Hans Verkuil , Laurent Pinchart Cc: linux-input@vger.kernel.org, linux-media@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --LtoVp3brI7i091GdNUFhQkAfMoOVB2dJ3 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hello Hans, On 04.02.2015 09:08, Hans Verkuil wrote: > I remain very skeptical about the use of dma-contig (or dma-sg for that= > matter). Have you tried using vmalloc and check if the USB core isn't > automatically using DMA transfers for that? >=20 > Basically I would like to see proof that vmalloc is not an option befor= e > allowing dma-contig (or dma-sg if you can figure out why that isn't > working). >=20 > You can also make a version with vmalloc and I'll merge that, and then > you can look more into the DMA issues. That way the driver is merged, > even if it is perhaps not yet optimal, and you can address that part la= ter. OK, that sounds sensible, I will try that route. When using videobuf2-vmalloc, what do I pass back for alloc_ctxs in queue_setup? Best, Florian --=20 SENT FROM MY DEC VT50 TERMINAL --LtoVp3brI7i091GdNUFhQkAfMoOVB2dJ3 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlTR75IACgkQ7CzyshGvatjYVwCfZ4ieGe97jqGjIM+hVdYriQd2 xCsAoPNwqbfdLiEf3RENdW6XqmSBRNu9 =jhpz -----END PGP SIGNATURE----- --LtoVp3brI7i091GdNUFhQkAfMoOVB2dJ3--