From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752389AbdF2HeR (ORCPT ); Thu, 29 Jun 2017 03:34:17 -0400 Received: from mail.free-electrons.com ([62.4.15.54]:56227 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752013AbdF2HeJ (ORCPT ); Thu, 29 Jun 2017 03:34:09 -0400 Date: Thu, 29 Jun 2017 09:33:56 +0200 From: Maxime Ripard To: Priit Laes Cc: Michael Turquette , Stephen Boyd , Rob Herring , Mark Rutland , Chen-Yu Tsai , Russell King , Philipp Zabel , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com, Jonathan Liu Subject: Re: [PATCH v4 1/6] clk: sunxi-ng: div: Add support for fixed post-divider Message-ID: <20170629073356.nljcjiqw35t3y4t2@flea> References: <20170627094607.2hkgzkycclboemvu@flea.lan> <20170628175949.GA3706@plaes.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="nqbci5n5l3p2o5o3" Content-Disposition: inline In-Reply-To: <20170628175949.GA3706@plaes.org> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --nqbci5n5l3p2o5o3 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jun 28, 2017 at 05:59:49PM +0000, Priit Laes wrote: > On Tue, Jun 27, 2017 at 11:46:07AM +0200, Maxime Ripard wrote: > > Hi! > >=20 > > On Sun, Jun 25, 2017 at 11:45:42PM +0300, Priit Laes wrote: > > > SATA clock on sun4i/sun7i is of type (parent) / M / 6 where > > > 6 is fixed post-divider. > > >=20 > > > Signed-off-by: Priit Laes > > > --- > > > drivers/clk/sunxi-ng/ccu_div.c | 12 ++++++++++-- > > > drivers/clk/sunxi-ng/ccu_div.h | 3 ++- > > > 2 files changed, 12 insertions(+), 3 deletions(-) > > >=20 > > > diff --git a/drivers/clk/sunxi-ng/ccu_div.c b/drivers/clk/sunxi-ng/cc= u_div.c > > > index c0e5c10..de30e15 100644 > > > --- a/drivers/clk/sunxi-ng/ccu_div.c > > > +++ b/drivers/clk/sunxi-ng/ccu_div.c > > > @@ -62,8 +62,13 @@ static unsigned long ccu_div_recalc_rate(struct cl= k_hw *hw, > > > parent_rate =3D ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, = -1, > > > parent_rate); > > > =20 > > > - return divider_recalc_rate(hw, parent_rate, val, cd->div.table, > > > - cd->div.flags); > > > + val =3D divider_recalc_rate(hw, parent_rate, val, cd->div.table, > > > + cd->div.flags); > > > + > > > + if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV) > > > + val /=3D cd->fixed_post_div; > > > + > > > + return val; > > > } > > > =20 > > > static int ccu_div_determine_rate(struct clk_hw *hw, > > > @@ -89,6 +94,9 @@ static int ccu_div_set_rate(struct clk_hw *hw, unsi= gned long rate, > > > val =3D divider_get_val(rate, parent_rate, cd->div.table, cd->div.w= idth, > > > cd->div.flags); > > > =20 > > > + if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV) > > > + val *=3D cd->fixed_post_div; > > > + > > > spin_lock_irqsave(cd->common.lock, flags); > > > =20 > > > reg =3D readl(cd->common.base + cd->common.reg); > >=20 > > You also need to adjust the round rate call back to take into account > > the post divider before calling divider_round_rate_parent, and after > > since that function can modify the parent_rate. >=20 > Is there a way to trigger this function? I don't see it getting called. yep, clk_round_rate will call it, and it's also in the code path of clk_set_rate. > > > diff --git a/drivers/clk/sunxi-ng/ccu_div.h b/drivers/clk/sunxi-ng/cc= u_div.h > > > index 08d0744..f3a5028 100644 > > > --- a/drivers/clk/sunxi-ng/ccu_div.h > > > +++ b/drivers/clk/sunxi-ng/ccu_div.h > > > @@ -86,9 +86,10 @@ struct ccu_div_internal { > > > struct ccu_div { > > > u32 enable; > > > =20 > > > - struct ccu_div_internal div; > > > + struct ccu_div_internal div; > >=20 > > Spurious change? >=20 > Nope, it was not indented the same way as other variables. > Should I send it as separate patch? Hmmm, not really, leave it there. Thanks! Maxime --=20 Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com --nqbci5n5l3p2o5o3 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIcBAEBAgAGBQJZVK1jAAoJEBx+YmzsjxAgQIYQAJsZzktFeszC/CvccgGGrinw JheQuR8k3thxYUYaaO6IAwE34TV7N8XxJjLDguFf9Jma2v5mjnJwYmiX6rpnR0Nw pLupe3PeT2vaEo+PXL9iovSpSF1Rba16dBPNeyblcsfWcLGmbzD1BjQ4NWOkddf/ HODLKSojzWDm8Js95Vr+8BL6gyRg35t9qZkjJkRyWWEBKKFNTJds6doxyj/FA+iV RXEBAkOAqkvteLaWTQEcLVrerD7r2naIKJZLyoBMEHhpFvoGrtJyzKAVcFjIynpx yzrySAWVsuW1DzsxDYsHMtPD3Mbx+BK5DHD+SE6wLiOHXXJWu4yUNzIby/nH6fVY PRzdgYNjjleuDikgHgeQMroUcS0viiMJ5TOMtscHX7eWZ00qlnCOSFsE4VeVdMaW s/XEkWdYBbGV9GFMxdoEt6wPX/2YvmsDGDPmYpjqtXZ/fXOkBiGD6fZglGZvR3Ap /Iz7xjqKLnfifcJJnjaCOjS8Aa2KvG1Q9PnMbyaztieAFfSXuxn1gtZxuOa4+QzT +MQCoa7bvIqBk0KkbTg1BmYFwfhxrnJR6c68HFX8FNUPiZgolJ1L7QIO49Mcetjz LN/XIq6lVG2gvI++RshUAJCRxOCct4zwDKw58PEkGrMOmrh3BHOwjBy5luWssYud fNNzbw6NaxmvdSZyAdbV =PHMU -----END PGP SIGNATURE----- --nqbci5n5l3p2o5o3--