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Message-ID: <20200820164820.4fec97b3@collabora.com>
Date: Thu, 20 Aug 2020 16:48:20 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Parshuram Thombare <pthombar@...ence.com>
Cc: <bbrezillon@...nel.org>, <vitor.soares@...opsys.com>,
<pgaj@...ence.com>, <linux-i3c@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <mparab@...ence.com>,
<praneeth@...com>
Subject: Re: [PATCH v3] i3c: master: fix for SETDASA and DAA process
On Thu, 20 Aug 2020 15:38:26 +0200
Parshuram Thombare <pthombar@...ence.com> wrote:
> This patch fix following issue.
> Controller slots blocked for devices with static_addr
> but no init_dyn_addr may limit the number of I3C devices
> on the bus which gets dynamic address in DAA. So
> instead of attaching all the devices with static_addr,
> now we only attach the devices which successfully
> complete SETDASA. For remaining devices with init_dyn_addr,
> i3c_master_add_i3c_dev_locked() will try to set requested
> dynamic address after DAA.
>
> Fixes: 3a379bbcea0a ("i3c: Add core I3C infrastructure")
Hm, not sure that qualifies as a fix. The current implementation was
correct, it was just reserving a slot in the device table for devices
that didn't have an init address or on which SETDASA failed.
> Signed-off-by: Parshuram Thombare <pthombar@...ence.com>
> ---
> Changes between v2 and v3 are:
> 1. Keeping init_dyn_addr reserved.
> 2. Code refactoring and changes in comments.
>
> Changes between v1 and v2 are:
> 1. Added boardinfo attach fix.
> 2. Removed reattach issue related fix.
> 3. Reserve init_dyn_addr initially, so that it will not
> be used in DAA and attempt can be made to set those
> firmware requested dynamic address after DAA.
> ---
> drivers/i3c/master.c | 115 ++++++++++++++++++++++++++++----------------------
> 1 files changed, 65 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index 3d995f2..24543d8 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -1367,7 +1367,9 @@ static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
> enum i3c_addr_slot_status status;
> int ret;
>
> - if (dev->info.dyn_addr != old_dyn_addr) {
> + if (dev->info.dyn_addr != old_dyn_addr &&
> + (!dev->boardinfo ||
> + dev->info.dyn_addr != dev->boardinfo->init_dyn_addr)) {
> status = i3c_bus_get_addr_slot_status(&master->bus,
> dev->info.dyn_addr);
> if (status != I3C_ADDR_SLOT_FREE)
> @@ -1426,33 +1428,49 @@ static void i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev)
> master->ops->detach_i2c_dev(dev);
> }
>
> -static void i3c_master_pre_assign_dyn_addr(struct i3c_dev_desc *dev)
> +static int i3c_master_pre_assign_dyn_addr(struct i3c_master_controller *master,
> + struct i3c_dev_boardinfo *boardinfo)
That function now does more than just assigning a dynamic address: it
also creates the i3c_dev_desc. It should be renamed accordingly
(i3c_master_early_i3c_dev_add() maybe).
> {
> - 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;
> +
> + i3cdev->boardinfo = boardinfo;
>
> - ret = i3c_master_setdasa_locked(master, dev->info.static_addr,
> - dev->boardinfo->init_dyn_addr);
> + 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:
> + i3c_master_detach_i3c_dev(i3cdev);
> +err_attach:
> + 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.
> *
> * 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
> *
> * 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 +1737,32 @@ 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().
> */
> - 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.
> + */
> + if (!i3cboardinfo->init_dyn_addr ||
> + (i3cboardinfo->static_addr &&
> + !i3c_master_pre_assign_dyn_addr(master, i3cboardinfo)))
> + 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);
You should reserve the address before calling
i3c_master_pre_assign_dyn_addr():
/*
* 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.
*/
if (!i3cboardinfo->init_dyn_addr ||
!i3cboardinfo->static_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);
i3c_master_pre_assign_dyn_addr(master, i3cboardinfo);
> + }
>
> ret = i3c_master_do_daa(master);
> if (ret)
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