linux-kernel - RE: [PATCH V4 1/2] i3c: master: support to adjust first broadcast address speed

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Message-ID:
 <DB7PR04MB5003CB868C835B8A614C863DE89A2@DB7PR04MB5003.eurprd04.prod.outlook.com>
Date: Tue, 10 Sep 2024 05:11:38 +0000
From: Carlos Song <carlos.song@....com>
To: Frank Li <frank.li@....com>, Alexandre Belloni
	<alexandre.belloni@...tlin.com>
CC: "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
	"conor.culhane@...vaco.com" <conor.culhane@...vaco.com>,
	"linux-i3c@...ts.infradead.org" <linux-i3c@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>
Subject: RE: [PATCH V4 1/2] i3c: master: support to adjust first broadcast
 address speed



> On Mon, Sep 09, 2024 at 11:03:29PM +0200, Alexandre Belloni wrote:
> > On 09/09/2024 15:58:40-0400, Frank Li wrote:
> > > On Thu, Sep 05, 2024 at 03:45:56PM +0800, Carlos Song wrote:
> > > > According to I3C spec 6.2 Timing Specification, the Open Drain
> > > > High Period of SCL Clock timing for first broadcast address should
> > > > be adjusted to 200ns at least. I3C device working as i2c device
> > > > will see the broadcast to close its Spike Filter then change to
> > > > work at I3C mode. After that I3C open drain SCL high level should be
> adjusted back.
> > > >
> > > > Signed-off-by: Carlos Song <carlos.song@....com>
> > > > Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > > > Reviewed-by: Frank Li <Frank.Li@....com>
> > >
> > > Alexandre Belloni:
> > >
> > > 	I have not seen these in patch work
> > > 	https://patchwork.kernel.org/project/linux-i3c/list/
> > >
> > > 	Any thing wrong. These two patches is critial for some boards.
> > > Could you please take care it?
> >
> > They didn't make it to the list, please subscribe and resend. Also, it
> > is very very difficult to keep track of all the patches you sent s I'm
> > not sure what actually needs to be applied and what has been dropped r
> > superseded.
> 
> Sorry for that. Only one big patches set (about hotjoin fix) and update maintaner
> are directly sent from me.
> 
> There are 3 patches from carlos.
> one patch already in patchwork
> https://patchwork.kernel.org/project/linux-i3c/patch/20240719080233.842771
> -1-carlos.song@....com/
> the other two patches is what's talking about in this email.
> 

[Carlos]:
Hi,
I have subscribe to linux-i3c@...ts.infradead.org. Then resend these 2 patches V5.

Sorry for confusing!

Thank you very much.

> Anther one from Ravindra can be dropped.
> 
> I am not sure how I can help this because there are difference contributor.
> 
> Frank
> 
> >
> > >
> > > best regards
> > > Frank Li
> > >
> > > > ---
> > > > Change for V4:
> > > > - No change. Send this patch with svc-i3c-master.c fix patch.
> > > > Change for V3:
> > > > - Modify comments from Miquel's suggestion Chnage for V2:
> > > > - Fix set_speed description from Frank's comment
> > > > ---
> > > >  drivers/i3c/master.c       | 12 ++++++++++++
> > > >  include/linux/i3c/master.h | 16 ++++++++++++++++
> > > >  2 files changed, 28 insertions(+)
> > > >
> > > > diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index
> > > > 7028f03c2c42..6f3eb710a75d 100644
> > > > --- a/drivers/i3c/master.c
> > > > +++ b/drivers/i3c/master.c
> > > > @@ -1868,6 +1868,12 @@ static int i3c_master_bus_init(struct
> i3c_master_controller *master)
> > > >  		goto err_bus_cleanup;
> > > >  	}
> > > >
> > > > +	if (master->ops->set_speed) {
> > > > +		ret = master->ops->set_speed(master,
> I3C_OPEN_DRAIN_SLOW_SPEED);
> > > > +		if (ret)
> > > > +			goto err_bus_cleanup;
> > > > +	}
> > > > +
> > > >  	/*
> > > >  	 * Reset all dynamic address that may have been assigned before
> > > >  	 * (assigned by the bootloader for example).
> > > > @@ -1876,6 +1882,12 @@ static int i3c_master_bus_init(struct
> i3c_master_controller *master)
> > > >  	if (ret && ret != I3C_ERROR_M2)
> > > >  		goto err_bus_cleanup;
> > > >
> > > > +	if (master->ops->set_speed) {
> > > > +		master->ops->set_speed(master,
> I3C_OPEN_DRAIN_NORMAL_SPEED);
> > > > +		if (ret)
> > > > +			goto err_bus_cleanup;
> > > > +	}
> > > > +
> > > >  	/* Disable all slave events before starting DAA. */
> > > >  	ret = i3c_master_disec_locked(master, I3C_BROADCAST_ADDR,
> > > >  				      I3C_CCC_EVENT_SIR | I3C_CCC_EVENT_MR |
> diff --git
> > > > a/include/linux/i3c/master.h b/include/linux/i3c/master.h index
> > > > 074f632868d9..2a1ed05d5782 100644
> > > > --- a/include/linux/i3c/master.h
> > > > +++ b/include/linux/i3c/master.h
> > > > @@ -277,6 +277,20 @@ enum i3c_bus_mode {
> > > >  	I3C_BUS_MODE_MIXED_SLOW,
> > > >  };
> > > >
> > > > +/**
> > > > + * enum i3c_open_drain_speed - I3C open-drain speed
> > > > + * @I3C_OPEN_DRAIN_SLOW_SPEED: Slow open-drain speed for sending
> the first
> > > > + *				broadcast address. The first broadcast address at this
> speed
> > > > + *				will be visible to all devices on the I3C bus. I3C devices
> > > > + *				working in I2C mode will turn off their spike filter when
> > > > + *				switching into I3C mode.
> > > > + * @I3C_OPEN_DRAIN_NORMAL_SPEED: Normal open-drain speed in
> I3C bus mode.
> > > > + */
> > > > +enum i3c_open_drain_speed {
> > > > +	I3C_OPEN_DRAIN_SLOW_SPEED,
> > > > +	I3C_OPEN_DRAIN_NORMAL_SPEED,
> > > > +};
> > > > +
> > > >  /**
> > > >   * enum i3c_addr_slot_status - I3C address slot status
> > > >   * @I3C_ADDR_SLOT_FREE: address is free @@ -436,6 +450,7 @@
> > > > struct i3c_bus {
> > > >   *		      NULL.
> > > >   * @enable_hotjoin: enable hot join event detect.
> > > >   * @disable_hotjoin: disable hot join event detect.
> > > > + * @set_speed: adjust I3C open drain mode timing.
> > > >   */
> > > >  struct i3c_master_controller_ops {
> > > >  	int (*bus_init)(struct i3c_master_controller *master); @@ -464,6
> > > > +479,7 @@ struct i3c_master_controller_ops {
> > > >  				 struct i3c_ibi_slot *slot);
> > > >  	int (*enable_hotjoin)(struct i3c_master_controller *master);
> > > >  	int (*disable_hotjoin)(struct i3c_master_controller *master);
> > > > +	int (*set_speed)(struct i3c_master_controller *master, enum
> > > > +i3c_open_drain_speed speed);
> > > >  };
> > > >
> > > >  /**
> > > > --
> > > > 2.34.1
> > > >
> >
> > --
> > Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel
> > engineering https://bootlin.com