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From: Boris Brezillon <boris.brezillon@collabora.com>
To: Vitor Soares <Vitor.Soares@synopsys.com>
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
	Joao.Pinto@synopsys.com, bbrezillon@kernel.org,
	linux-kernel@vger.kernel.org, robh+dt@kernel.org,
	linux-i3c@lists.infradead.org
Subject: Re: [PATCH 2/4] i3c: master: Check if devices have i3c_dev_boardinfo on i3c_master_add_i3c_dev_locked()
Date: Thu, 29 Aug 2019 12:44:57 +0200
Message-ID: <20190829124457.3a750932@collabora.com> (raw)
In-Reply-To: <3e21481ddf53ea58f5899df6ec542b79b8cbcd68.1567071213.git.vitor.soares@synopsys.com>

On Thu, 29 Aug 2019 12:19:33 +0200
Vitor Soares <Vitor.Soares@synopsys.com> wrote:

> The I3C devices described in DT might not be attached to the master which
> doesn't allow to assign a specific dynamic address.

I remember testing this when developing the framework, so, unless
another patch regressed it, it should already work. I suspect patch 1
is actually the regressing this use case.

> 
> This patch check if a device has i3c_dev_boardinfo and add it to
> i3c_dev_desc structure. In this conditions, the framework will try to
> assign the i3c_dev_boardinfo->init_dyn_addr even if stactic address = 0.
> 
> Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
> ---
>  drivers/i3c/master.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index 4d29e1f..85fbda6 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -1795,6 +1795,23 @@ i3c_master_search_i3c_dev_duplicate(struct i3c_dev_desc *refdev)
>  	return NULL;
>  }
>  
> +static struct i3c_dev_boardinfo *
> +i3c_master_search_i3c_boardinfo(struct i3c_dev_desc *dev)
> +{
> +	struct i3c_master_controller *master = i3c_dev_get_master(dev);
> +	struct i3c_dev_boardinfo *boardinfo;
> +
> +	if (dev->boardinfo)
> +		return NULL;
> +
> +	list_for_each_entry(boardinfo, &master->boardinfo.i3c, node) {
> +		if (dev->info.pid == boardinfo->pid)
> +			return boardinfo;
> +	}
> +
> +	return NULL;
> +}
> +
>  /**
>   * i3c_master_add_i3c_dev_locked() - add an I3C slave to the bus
>   * @master: master used to send frames on the bus
> @@ -1816,6 +1833,7 @@ int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master,
>  {
>  	struct i3c_device_info info = { .dyn_addr = addr };
>  	struct i3c_dev_desc *newdev, *olddev;
> +	struct i3c_dev_boardinfo *boardinfo;
>  	u8 old_dyn_addr = addr, expected_dyn_addr;
>  	struct i3c_ibi_setup ibireq = { };
>  	bool enable_ibi = false;
> @@ -1875,6 +1893,10 @@ int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master,
>  	if (ret)
>  		goto err_detach_dev;
>  
> +	boardinfo = i3c_master_search_i3c_boardinfo(newdev);
> +	if (boardinfo)
> +		newdev->boardinfo = boardinfo;
> +
>  	/*
>  	 * Depending on our previous state, the expected dynamic address might
>  	 * differ:


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Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-29 10:19 [PATCH 0/4] i3c: remove device if failed on pre_assign_dyn_addr() Vitor Soares
2019-08-29 10:19 ` [PATCH 1/4] i3c: master: detach and free device if pre_assign_dyn_addr() fails Vitor Soares
2019-08-29 10:41   ` Boris Brezillon
2019-08-29 13:53     ` Vitor Soares
2019-08-29 14:35       ` Boris Brezillon
2019-08-29 15:23         ` Vitor Soares
2019-08-29 15:37           ` Boris Brezillon
2019-08-29 16:23             ` Vitor Soares
2019-08-29 10:19 ` [PATCH 2/4] i3c: master: Check if devices have i3c_dev_boardinfo on i3c_master_add_i3c_dev_locked() Vitor Soares
2019-08-29 10:44   ` Boris Brezillon [this message]
2019-08-29 14:00     ` Vitor Soares
2019-08-29 14:39       ` Boris Brezillon
2019-08-29 14:39         ` Boris Brezillon
2019-08-29 15:07           ` Vitor Soares
2019-08-29 15:24             ` Boris Brezillon
2019-08-29 15:57               ` Vitor Soares
2019-08-29 16:15                 ` Boris Brezillon
2019-08-29 16:33                   ` Vitor Soares
2019-08-29 16:37                     ` Boris Brezillon
2019-08-29 16:27   ` Boris Brezillon
2019-08-29 10:19 ` [PATCH 3/4] dt-bindings: i3c: Make 'assigned-address' valid if static address != 0 Vitor Soares
2019-08-29 10:51   ` Boris Brezillon
2019-08-29 14:06     ` Vitor Soares
2019-08-29 10:19 ` [PATCH 4/4] i3c: master: dw: reattach device on first available location of address table Vitor Soares
2019-08-29 11:15   ` Boris Brezillon
2019-08-29 14:09     ` Vitor Soares

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