From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S937926AbcLVJeT (ORCPT ); Thu, 22 Dec 2016 04:34:19 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:39989 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754367AbcLVJeS (ORCPT ); Thu, 22 Dec 2016 04:34:18 -0500 Date: Thu, 22 Dec 2016 10:34:14 +0100 From: Pavel Machek To: Sakari Ailus Cc: ivo.g.dimitrov.75@gmail.com, sre@kernel.org, pali.rohar@gmail.com, linux-media@vger.kernel.org, galak@codeaurora.org, mchehab@osg.samsung.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5] media: Driver for Toshiba et8ek8 5MP sensor Message-ID: <20161222093414.GA26246@amd> References: <20161023200355.GA5391@amd> <20161119232943.GF13965@valkosipuli.retiisi.org.uk> <20161214122451.GB27011@amd> <20161221134235.GH16630@valkosipuli.retiisi.org.uk> <20161221224216.GA4681@amd> <20161221232930.GI16630@valkosipuli.retiisi.org.uk> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="zYM0uCDKw75PZbzx" Content-Disposition: inline In-Reply-To: <20161221232930.GI16630@valkosipuli.retiisi.org.uk> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --zYM0uCDKw75PZbzx Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > > > Thanks for the update. > > >=20 > > > On Wed, Dec 14, 2016 at 01:24:51PM +0100, Pavel Machek wrote: > > > ... > > > > +static int et8ek8_set_ctrl(struct v4l2_ctrl *ctrl) > > > > +{ > > > > + struct et8ek8_sensor *sensor =3D > > > > + container_of(ctrl->handler, struct et8ek8_sensor, ctrl_handler); > > > > + > > > > + switch (ctrl->id) { > > > > + case V4L2_CID_GAIN: > > > > + return et8ek8_set_gain(sensor, ctrl->val); > > > > + > > > > + case V4L2_CID_EXPOSURE: > > > > + { > > > > + int rows; > > > > + struct i2c_client *client =3D v4l2_get_subdevdata(&sensor->subde= v); > > > > + rows =3D ctrl->val; > > > > + return et8ek8_i2c_write_reg(client, ET8EK8_REG_16BIT, 0x1243, > > > > + swab16(rows)); > > >=20 > > > Why swab16()? Doesn't the et8ek8_i2c_write_reg() already do the right= thing? > > >=20 > > > 16-bit writes aren't used elsewhere... and the register address and v= alue > > > seem to have different endianness there, it looks like a bug to me in= that > > > function. > >=20 > > I'm pretty sure I did not invent that swab16(). I checked, and > > exposure seems to work properly. I tried swapping the bytes, but then > > exposure did not seem to work. So this one seems to be correct. >=20 > I can fix that too, but I have no device to test. In terms of how the > hardware is controlled there should be no difference anyway. Aha, now I understand; you want me to fix write_reg. I can do that. It seems read_reg has similar problem, but as noone is using 16-bit reads, so it is dormant. Ok, let me fix that. Best regards, Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --zYM0uCDKw75PZbzx Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlhbnhYACgkQMOfwapXb+vIPNQCeOHQdXkFkvbO/o188VEWjt3eq AtkAn1Wbhm9YVHthWQ/P0walI3wY68of =wnc+ -----END PGP SIGNATURE----- --zYM0uCDKw75PZbzx--