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Message-ID: <1598336468-9564-1-git-send-email-pthombar@cadence.com>
Date: Tue, 25 Aug 2020 08:21:08 +0200
From: Parshuram Thombare <pthombar@...ence.com>
To: <bbrezillon@...nel.org>, <vitor.soares@...opsys.com>
CC: <pgaj@...ence.com>, <linux-i3c@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <mparab@...ence.com>,
<praneeth@...com>, Parshuram Thombare <pthombar@...ence.com>
Subject: [PATCH v5] i3c: master: fix for SETDASA and DAA process
This patch fixes the following issue.
Controller slots blocked for the devices with only static_addr
or 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. Similarly, for the devices with only
init_dyn_addr, init_dyn_addr are reserved, and after DAA
i3c_master_add_i3c_dev_locked() will try to set the requested
dynamic address.
Signed-off-by: Parshuram Thombare <pthombar@...ence.com>
---
Changes between v4 and v5 are:
1. Modifications in comments and labels.
Changes between v3 and v4 are:
1. Code rectoring and removed Fixes tag.
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 | 128 +++++++++++++++++++++++++++++--------------------
1 files changed, 76 insertions(+), 52 deletions(-)
diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 3d995f2..ccf9b4e 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_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;
+
+ 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_free_dev;
+
+ ret = i3c_master_setdasa_locked(master, i3cdev->info.static_addr,
+ i3cdev->boardinfo->init_dyn_addr);
+ if (ret)
+ goto err_detach_dev;
- 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_detach_dev:
+ i3c_master_detach_i3c_dev(i3cdev);
+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
@@ -1632,11 +1650,14 @@ 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
+ * 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
+ * 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 +1668,6 @@ 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 +1699,6 @@ 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
@@ -1743,11 +1735,43 @@ 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)
--
1.7.1
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