linux-kernel - Re: [PATCH 4/4] i3c: master: dw: reattach device on first available location of address table

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Date:   Thu, 29 Aug 2019 13:15:19 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Vitor Soares <Vitor.Soares@...opsys.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-i3c@...ts.infradead.org, bbrezillon@...nel.org,
        robh+dt@...nel.org, mark.rutland@....com, Joao.Pinto@...opsys.com
Subject: Re: [PATCH 4/4] i3c: master: dw: reattach device on first available
 location of address table

On Thu, 29 Aug 2019 12:19:35 +0200
Vitor Soares <Vitor.Soares@...opsys.com> wrote:

> For today the reattach function only update the device address on the
> controller.
> 
> Update the location to the first available too, will optimize the
> enumeration process avoiding additional checks to keep the available
> positions on address table consecutive.

Given the number of available slots I honestly don't think it makes a
difference, but I also don't mind this change, so

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> 
> Signed-off-by: Vitor Soares <vitor.soares@...opsys.com>
> ---
>  drivers/i3c/master/dw-i3c-master.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
> index 1d83c97..62261ac 100644
> --- a/drivers/i3c/master/dw-i3c-master.c
> +++ b/drivers/i3c/master/dw-i3c-master.c
> @@ -898,6 +898,22 @@ static int dw_i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
>  	struct dw_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
>  	struct i3c_master_controller *m = i3c_dev_get_master(dev);
>  	struct dw_i3c_master *master = to_dw_i3c_master(m);
> +	int pos;
> +
> +	pos = dw_i3c_master_get_free_pos(master);
> +
> +	if (data->index > pos && pos > 0) {
> +		writel(0,
> +		       master->regs +
> +		       DEV_ADDR_TABLE_LOC(master->datstartaddr, data->index));
> +
> +		master->addrs[data->index] = 0;
> +		master->free_pos |= BIT(data->index);
> +
> +		data->index = pos;
> +		master->addrs[pos] = dev->info.dyn_addr;
> +		master->free_pos &= ~BIT(pos);
> +	}
>  
>  	writel(DEV_ADDR_TABLE_DYNAMIC_ADDR(dev->info.dyn_addr),
>  	       master->regs +