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=?us-ascii?Q?QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFB?= =?us-ascii?Q?QUFBQUFBQUVBQUFBQUFBQUFBZ0FBQUFBQW5nQUFBSFlBWndCZkFHc0FaUUI1?= =?us-ascii?Q?QUhjQWJ3QnlBR1FBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFB?= =?us-ascii?Q?QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFB?= =?us-ascii?Q?QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFB?= =?us-ascii?Q?QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFRQUFBQUFB?= =?us-ascii?Q?QUFBQ0FBQUFBQUE9Ii8+PC9tZXRhPg=3D=3D?= x-originating-ip: [10.107.25.87] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Boris, From: Boris Brezillon Date: Tue, Apr 16, 2019 at 15:52:50 > On Tue, 16 Apr 2019 14:24:57 +0000 > Vitor Soares wrote: >=20 > > Hi Boris, > >=20 > > From: Boris Brezillon > > Date: Tue, Apr 16, 2019 at 06:50:41 > >=20 > > > On Mon, 15 Apr 2019 20:46:41 +0200 > > > Vitor Soares wrote: > > > =20 > > > > Currently in case of mixed slow bus topologie and all i2c devices > > > > support FM+ speed, the i3c subsystem limite the SCL to FM speed. =20 > > > =20 > >=20 > > I will it replace with your message below. > >=20 > > > " > > > Currently the I3C framework limits SCL frequency to FM speed when > > > dealing with a mixed slow bus, even if all I2C devices are FM+ capabl= e. > > > " > > > =20 > > > > Also in case on mixed slow bus mode the max speed for both > > > > i2c or i3c transfers is FM or FM+. =20 > > >=20 > > > Looks like you're basically repeating what you said above. =20 > >=20 > > What I meant was that I3C framework isn't limiting the I3C speed in cas= e=20 > > of mixed slow bus. >=20 > Oh, okay, then maybe something like >=20 > " > The core was also not accounting for I3C speed limitations when > operating in mixed slow mode and was erroneously using FM+ speed as the > max I2C speed when operating in mixed fast mode. > " Sounds good to me. Thanks for the advise. >=20 > >=20 > > > =20 > > > >=20 > > > > This patch fix the definition of i2c and i3c scl rate based on bus = =20 > > >=20 > > > ^fixes on the bus > > > =20 > > > > topologie and LVR[4] if no user input. =20 > > >=20 > > > ^topology ^if the rate is not already specified by the user. > > > =20 > > > > In case of mixed slow mode the i3c scl rate is overridden. =20 > > >=20 > > > ^ with the max > > > I2C rate. > > > =20 > > > >=20 > > > > Fixes: 3a379bbcea0a ("i3c: Add core I3C infrastructure") > > > > Signed-off-by: Vitor Soares > > > > Cc: Boris Brezillon > > > > Cc: > > > > Cc: > > > > --- > > > > drivers/i3c/master.c | 39 +++++++++++++++++++++++++-------------- > > > > 1 file changed, 25 insertions(+), 14 deletions(-) > > > >=20 > > > > diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c > > > > index 909c2ad..1c4a86a 100644 > > > > --- a/drivers/i3c/master.c > > > > +++ b/drivers/i3c/master.c > > > > @@ -564,20 +564,30 @@ static const struct device_type i3c_masterdev= _type =3D { > > > > .groups =3D i3c_masterdev_groups, > > > > }; > > > > =20 > > > > -int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mod= e) > > > > +int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mod= e, > > > > + unsigned long i2c_scl_rate) =20 > > >=20 > > >=20 > > > Can we rename the last arg into max_i2c_scl_rate? =20 > >=20 > > The i2c_scl_rate is base on LVR[4] bit and the user can set a higher sc= l=20 > > rate, this is reason I didn't named it to max_i2c_scl_rate. > > But if you think that make more sense I'm ok with that. >=20 > In this context it does encode the maximum rate allowed by the spec > (based on LVR parsing), so max_i2c_rate sounds like a correct name to > me. >=20 > >=20 > > > =20 > > > > { > > > > i3cbus->mode =3D mode; > > > > =20 > > > > - if (!i3cbus->scl_rate.i3c) > > > > - i3cbus->scl_rate.i3c =3D I3C_BUS_TYP_I3C_SCL_RATE; > > > > - > > > > - if (!i3cbus->scl_rate.i2c) { > > > > - if (i3cbus->mode =3D=3D I3C_BUS_MODE_MIXED_SLOW) > > > > - i3cbus->scl_rate.i2c =3D I3C_BUS_I2C_FM_SCL_RATE; > > > > - else > > > > - i3cbus->scl_rate.i2c =3D I3C_BUS_I2C_FM_PLUS_SCL_RATE; > > > > + switch (i3cbus->mode) { > > > > + case I3C_BUS_MODE_PURE: > > > > + if (!i3cbus->scl_rate.i3c) > > > > + i3cbus->scl_rate.i3c =3D I3C_BUS_TYP_I3C_SCL_RATE; > > > > + break; > > > > + case I3C_BUS_MODE_MIXED_FAST: > > > > + if (!i3cbus->scl_rate.i3c) > > > > + i3cbus->scl_rate.i3c =3D I3C_BUS_TYP_I3C_SCL_RATE; > > > > + if (!i3cbus->scl_rate.i2c) > > > > + i3cbus->scl_rate.i2c =3D i2c_scl_rate; > > > > + break; > > > > + case I3C_BUS_MODE_MIXED_SLOW: > > > > + if (!i3cbus->scl_rate.i2c) > > > > + i3cbus->scl_rate.i2c =3D i2c_scl_rate; > > > > + i3cbus->scl_rate.i3c =3D i3cbus->scl_rate.i2c; =20 > > >=20 > > > Maybe we should do > > >=20 > > > if (!i3cbus->scl_rate.i3c || > > > i3cbus->scl_rate.i3c > i3cbus->scl_rate.i2c) > > > i3cbus->scl_rate.i3c =3D i3cbus->scl_rate.i2c; > > > =20 > > > Just in case the I3C rate forced by the user is lower than the max I2= C > > > rate. =20 > >=20 > > That was something that I considered but TBH it isn't a real use case. >=20 > Add a WARN_ON() to at least catch such inconsistencies. And maybe we > should add a dev_warn() when the user-defined rates do not match > the mode/LVR constraints. It's easy to do a mistake when writing a dts. I think the WARN_ON() is too evasive on the screen and won't provide the=20 information we want. The dev_warn() should work perfectly here. if (i3cbus->scl_rate.i3c < i3cbus->scl_rate.i2c) dev_warn(&i3cbus->cur_master->dev->dev, "%s: i3c-scl-hz lower then i2c-scl-hz\n", __func__); if (i3cbus->scl_rate.i2c !=3D I3C_BUS_I2C_FM_SCL_RATE || i3cbus->scl_rate.i2c !=3D I3C_BUS_I2C_FM_PLUS_SCL_RATE) dev_warn(&i3cbus->cur_master->dev->dev, "%s: i2c-scl-hz not defined according MIPI I3C spec\n",=20 __func__); Maybe it make more sense to do this check on of_populate_i3c_bus(), what=20 do you think?