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Message-ID: <20200823121430.272d97f9@collabora.com>
Date: Sun, 23 Aug 2020 12:14:30 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Parshuram Thombare <pthombar@...ence.com>, <bbrezillon@...nel.org>,
mparab@...ence.com, praneeth@...com, pgaj@...ence.com
Cc: <vitor.soares@...opsys.com>, linux-kernel@...r.kernel.org,
linux-i3c@...ts.infradead.org
Subject: Re: [PATCH v4] i3c: master: fix for SETDASA and DAA process
On Sun, 23 Aug 2020 11:59:18 +0200
Boris Brezillon <boris.brezillon@...labora.com> wrote:
> > -static void i3c_master_pre_assign_dyn_addr(struct i3c_dev_desc *dev)
> > +static int i3c_master_early_i3c_dev_add(struct i3c_master_controller *master,
> > + struct i3c_dev_boardinfo *boardinfo)
> > {
> > - struct i3c_master_controller *master = i3c_dev_get_master(dev);
> > + struct i3c_device_info info = {
> > + .static_addr = boardinfo->static_addr,
> > + };
> > + struct i3c_dev_desc *i3cdev;
> > int ret;
> >
> > - if (!dev->boardinfo || !dev->boardinfo->init_dyn_addr ||
> > - !dev->boardinfo->static_addr)
> > - return;
> > + i3cdev = i3c_master_alloc_i3c_dev(master, &info);
> > + if (IS_ERR(i3cdev))
> > + return -ENOMEM;
> >
> > - ret = i3c_master_setdasa_locked(master, dev->info.static_addr,
> > - dev->boardinfo->init_dyn_addr);
> > + i3cdev->boardinfo = boardinfo;
> > +
> > + ret = i3c_master_attach_i3c_dev(master, i3cdev);
> > if (ret)
> > - return;
> > + goto err_attach;
> > +
> > + ret = i3c_master_setdasa_locked(master, i3cdev->info.static_addr,
> > + i3cdev->boardinfo->init_dyn_addr);
> > + if (ret)
> > + goto err_setdasa;
> >
> > - dev->info.dyn_addr = dev->boardinfo->init_dyn_addr;
> > - ret = i3c_master_reattach_i3c_dev(dev, 0);
> > + i3cdev->info.dyn_addr = i3cdev->boardinfo->init_dyn_addr;
> > + ret = i3c_master_reattach_i3c_dev(i3cdev, 0);
> > if (ret)
> > goto err_rstdaa;
> >
> > - ret = i3c_master_retrieve_dev_info(dev);
> > + ret = i3c_master_retrieve_dev_info(i3cdev);
> > if (ret)
> > goto err_rstdaa;
> >
> > - return;
> > + return 0;
> >
> > err_rstdaa:
> > - i3c_master_rstdaa_locked(master, dev->boardinfo->init_dyn_addr);
> > + i3c_master_rstdaa_locked(master, i3cdev->boardinfo->init_dyn_addr);
> > +err_setdasa:
Let's be consistent with the rest of the framework. Labels don't encode
what the error is but what's expected to be undone. IOW, this one
should be err_detach_dev
> > + i3c_master_detach_i3c_dev(i3cdev);
> > +err_attach:
and this one err_free_dev.
> > + i3c_master_free_i3c_dev(i3cdev);
> > +
> > + return ret;
> > }
> >
> > static void
> > @@ -1619,8 +1637,8 @@ static void i3c_master_detach_free_devs(struct i3c_master_controller *master)
> > * This function is following all initialisation steps described in the I3C
> > * specification:
> > *
> > - * 1. Attach I2C and statically defined I3C devs to the master so that the
> > - * master can fill its internal device table appropriately
> > + * 1. Attach I2C devs to the master so that the master can fill its internal
> > + * device table appropriately
> > *
> > * 2. Call &i3c_master_controller_ops->bus_init() method to initialize
> > * the master controller. That's usually where the bus mode is selected
> > @@ -1633,10 +1651,14 @@ static void i3c_master_detach_free_devs(struct i3c_master_controller *master)
> > * 4. Disable all slave events.
> > *
> > * 5. Pre-assign dynamic addresses requested by the FW with SETDASA for I3C
> > - * devices that have a static address
> > + * devices that have a static address and attach corresponding statically
> > + * defined I3C devices to the master. If only init_dyn_addr is available
> > + * or if SETDASA fails, reserve those init_dyn_addr to be used later to set
> > + * address using SETNEWDA after DAA.
I'd re-order this to match what really happens: first reserve slots for
devices that have an init_dyn_addr defined, then try to create+attach
devices that also have a static address defined.
> > *
> > * 6. Do a DAA (Dynamic Address Assignment) to assign dynamic addresses to all
> > - * remaining I3C devices
> > + * remaining I3C devices and attach them to the master if the dynamic address
> > + * assignment succeeds
Can we move that change to a separate patch?
> > *
> > * Once this is done, all I3C and I2C devices should be usable.
> > *
> > @@ -1647,7 +1669,6 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
> > enum i3c_addr_slot_status status;
> > struct i2c_dev_boardinfo *i2cboardinfo;
> > struct i3c_dev_boardinfo *i3cboardinfo;
> > - struct i3c_dev_desc *i3cdev;
> > struct i2c_dev_desc *i2cdev;
> > int ret;
> >
> > @@ -1679,34 +1700,6 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
> > goto err_detach_devs;
> > }
> > }
> > - list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) {
> > - struct i3c_device_info info = {
> > - .static_addr = i3cboardinfo->static_addr,
> > - };
> > -
> > - if (i3cboardinfo->init_dyn_addr) {
> > - status = i3c_bus_get_addr_slot_status(&master->bus,
> > - i3cboardinfo->init_dyn_addr);
> > - if (status != I3C_ADDR_SLOT_FREE) {
> > - ret = -EBUSY;
> > - goto err_detach_devs;
> > - }
> > - }
> > -
> > - i3cdev = i3c_master_alloc_i3c_dev(master, &info);
> > - if (IS_ERR(i3cdev)) {
> > - ret = PTR_ERR(i3cdev);
> > - goto err_detach_devs;
> > - }
> > -
> > - i3cdev->boardinfo = i3cboardinfo;
> > -
> > - ret = i3c_master_attach_i3c_dev(master, i3cdev);
> > - if (ret) {
> > - i3c_master_free_i3c_dev(i3cdev);
> > - goto err_detach_devs;
> > - }
> > - }
> >
> > /*
> > * Now execute the controller specific ->bus_init() routine, which
> > @@ -1744,10 +1737,33 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
> >
> > /*
> > * Pre-assign dynamic address and retrieve device information if
> > - * needed.
> > + * needed. And reserve the init_dyn_addr in case of failure, to retry
> > + * setting the requested address after DAA is done in
> > + * i3c_master_add_i3c_dev_locked().
That's no longer accurate: init_dyn_addr are reserved up-front and
device creation is only attempted if the device has a static address.
> > */
> > - i3c_bus_for_each_i3cdev(&master->bus, i3cdev)
> > - i3c_master_pre_assign_dyn_addr(i3cdev);
> > + list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) {
> > + /*
> > + * We don't attach devices which are not addressable
> > + * (no static_addr and dyn_addr) and devices with static_addr
> > + * but no init_dyn_addr will participate in DAA.
> > + */
>
> The above comment should be split:
>
> /*
> * We don't reserve a dynamic address for devices that
> * don't explicitly request one.
> */
>
> > + if (!i3cboardinfo->init_dyn_addr)
> > + continue;
> > +
> > + ret = i3c_bus_get_addr_slot_status(&master->bus,
> > + i3cboardinfo->init_dyn_addr);
> > + if (ret != I3C_ADDR_SLOT_FREE) {
> > + ret = -EBUSY;
> > + goto err_rstdaa;
> > + }
> > +
> > + i3c_bus_set_addr_slot_status(&master->bus,
> > + i3cboardinfo->init_dyn_addr,
> > + I3C_ADDR_SLOT_I3C_DEV);
> > +
> /*
> * Only try to create/attach devices that have a static
> * address. Other devices will be created/attached when
> * DAA happens, and the requested dynamic address will
> * be set using SETNEWDA once those devices become
> * addressable.
> */
> > + if (i3cboardinfo->static_addr)
> > + i3c_master_early_i3c_dev_add(master, i3cboardinfo);
> > + }
> >
> > ret = i3c_master_do_daa(master);
> > if (ret)
>
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