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i3c: master: fix for SETDASA and DAA process

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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.

Signed-off-by: Parshuram Thombare <pthombar@cadence.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/1598337109-14770-1-git-send-email-pthombar@cadence.com
This commit is contained in:
Parshuram Thombare 2020-08-25 08:31:49 +02:00 committed by Boris Brezillon
parent 9da36a7ec4
commit cc3a392d69
1 changed files with 74 additions and 51 deletions
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125
drivers/i3c/master.c
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@ -1373,7 +1373,9 @@ 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)
@ -1432,33 +1434,49 @@ 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_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_free_dev;
dev->info.dyn_addr = dev->boardinfo->init_dyn_addr;
ret = i3c_master_reattach_i3c_dev(dev, 0);
ret = i3c_master_setdasa_locked(master, i3cdev->info.static_addr,
i3cdev->boardinfo->init_dyn_addr);
if (ret)
goto err_detach_dev;
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_detach_dev:
i3c_master_detach_i3c_dev(i3cdev);
err_free_dev:
i3c_master_free_i3c_dev(i3cdev);
return ret;
}
static void
@ -1625,8 +1643,8 @@ 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
@ -1638,8 +1656,10 @@ 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
* 5. Reserve address slots for I3C devices with init_dyn_addr. And if devices
* also have static_addr, try to pre-assign dynamic addresses requested by
* the FW with SETDASA and attach corresponding statically defined I3C
* devices to the master.
*
* 6. Do a DAA (Dynamic Address Assignment) to assign dynamic addresses to all
* remaining I3C devices
@ -1653,7 +1673,6 @@ 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;
@ -1685,34 +1704,6 @@ 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
@ -1749,11 +1740,43 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
goto err_bus_cleanup;
/*
* Pre-assign dynamic address and retrieve device information if
* needed.
* Reserve init_dyn_addr first, and then try to pre-assign dynamic
* address and retrieve device information if needed.
* In case pre-assign dynamic address fails, setting dynamic address to
* the requested init_dyn_addr is retried 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 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)