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Message-ID: <DM5PR07MB3196F4A961B0603C883A686DC1570@DM5PR07MB3196.namprd07.prod.outlook.com>
Date: Tue, 25 Aug 2020 06:26:01 +0000
From: Parshuram Raju Thombare <pthombar@...ence.com>
To: Parshuram Raju Thombare <pthombar@...ence.com>,
"bbrezillon@...nel.org" <bbrezillon@...nel.org>,
"vitor.soares@...opsys.com" <vitor.soares@...opsys.com>
CC: Przemyslaw Gaj <pgaj@...ence.com>,
"linux-i3c@...ts.infradead.org" <linux-i3c@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Milind Parab <mparab@...ence.com>,
"praneeth@...com" <praneeth@...com>
Subject: RE: [PATCH v5] i3c: master: fix for SETDASA and DAA process
Please ignore this patch.
Regards,
Parshuram Thombare
>-----Original Message-----
>From: Parshuram Thombare <pthombar@...ence.com>
>Sent: Tuesday, August 25, 2020 11:51 AM
>To: bbrezillon@...nel.org; vitor.soares@...opsys.com
>Cc: Przemyslaw Gaj <pgaj@...ence.com>; linux-i3c@...ts.infradead.org; linux-
>kernel@...r.kernel.org; Milind Parab <mparab@...ence.com>;
>praneeth@...com; Parshuram Raju 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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