From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.free-electrons.com ([62.4.15.54]:44865 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751122AbdG0MZx (ORCPT ); Thu, 27 Jul 2017 08:25:53 -0400 Date: Thu, 27 Jul 2017 14:25:51 +0200 From: Maxime Ripard To: Baruch Siach Cc: Yong Deng , Mauro Carvalho Chehab , Rob Herring , Mark Rutland , Chen-Yu Tsai , Greg Kroah-Hartman , "David S. Miller" , Hans Verkuil , Arnd Bergmann , Hugues Fruchet , Yannick Fertre , Philipp Zabel , Benoit Parrot , Benjamin Gaignard , Jean-Christophe Trotin , Ramesh Shanmugasundaram , Minghsiu Tsai , Krzysztof Kozlowski , Robert Jarzmik , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com Subject: Re: [PATCH v2 1/3] media: V3s: Add support for Allwinner CSI. Message-ID: <20170727122551.qca4atjeet6whfrs@flea.lan> References: <1501131697-1359-1-git-send-email-yong.deng@magewell.com> <1501131697-1359-2-git-send-email-yong.deng@magewell.com> <20170727121644.jtpge4x432gfxhvw@tarshish> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="kjaywmgek52r2jvf" Content-Disposition: inline In-Reply-To: <20170727121644.jtpge4x432gfxhvw@tarshish> Sender: linux-media-owner@vger.kernel.org List-ID: --kjaywmgek52r2jvf Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jul 27, 2017 at 03:16:44PM +0300, Baruch Siach wrote: > Hi Yong, >=20 > I managed to get the Frame Done interrupt with the previous version of th= is=20 > driver on the A33 OLinuXino. No data yet (all zeros). I'm still working o= n it. >=20 > One comment below. >=20 > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote: > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface > > and CSI1 is used for parallel interface. This is not documented in > > datasheet but by testing and guess. > >=20 > > This patch implement a v4l2 framework driver for it. > >=20 > > Currently, the driver only support the parallel interface. MIPI-CSI2, > > ISP's support are not included in this patch. > >=20 > > Signed-off-by: Yong Deng > > --- >=20 > [...] >=20 > > +static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr) > > +{ > > + struct sun6i_csi_dev *sdev =3D sun6i_csi_to_dev(csi); > > + /* transform physical address to bus address */ > > + dma_addr_t bus_addr =3D addr - 0x40000000; >=20 > What is the source of this magic number? Is it platform dependent? Are th= ere=20 > other devices doing DMA that need this adjustment? This is the RAM base address in most (but not all) Allwinner SoCs. You'll want to use PHYS_OFFSET instead. Maxime --=20 Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com --kjaywmgek52r2jvf Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIcBAEBAgAGBQJZedvPAAoJEBx+YmzsjxAgP94P/1fQruY4FKlKe2YnwKC7rjlE QHG/nsWmhbLNDCljxATG7kpe7784R2ec3Ib+HMUM+tAkWIQ50HM/ZTBalSHx5Im+ CDy6+PUL062QMfCY6FcueNtTNfq05SpFE9//KQThyR53DYyItTihoQUGFr5eaNmz lQSFvGIkcv6cmlpFGwdVH8aZiYrgsaDq4nkmeuhjhwi7WUuaLDzVJ92H4i/Z4cg7 1rdo8GVz38j2vPJ2SlYqN+izrl9D+65wxH/HcY/tSgKhf5HF9IiNd4cDmcD7bWgJ MMbjRjWU6N51ct5XXF6xIvs/vHvSZHVt0noc9EWfu633GbVe3LVQMzw09zU9DVF+ AE6WWVZUgSTRJZg08an+98Qam57ShbDrxJH6xMMOAxPpUY9jm94r0a1vX2a4DEzn Dsw9FVrpP3y1ACWVPlqIIrVIOVlNIalrFvAm4d2zNAG+cvLjlkch8VAJgpO7mUmB Qq1VGB6Mt9anODLJ71MSYAU1MXvdv22c4XR68F3xTl8e5Yqy6fsM96V0vHpEhk/+ 6wws8N8cR7P4WzPwiawUHXdwPvyxyAzUk8Hpier34nySB71k/R8koVgpgFWSb36n bL9mnDb3Yf6jRcS/5ZO4zN0hUYBqaJSuhdtegAdYx8l463FQ47llhIj5tYJt2qN6 M1qzGQrJJdQ03CkWDPR1 =EJEd -----END PGP SIGNATURE----- --kjaywmgek52r2jvf--