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Thu, 14 May 2020 18:30:11 +0200 From: Parshuram Thombare To: , Subject: [PATCH] i3c: master: fix for SETDASA and DAA process Date: Thu, 14 May 2020 18:30:09 +0200 Message-ID: <1589473809-16708-1-git-send-email-pthombar@cadence.com> X-Mailer: git-send-email 2.2.2 MIME-Version: 1.0 X-OrganizationHeadersPreserved: maileu3.global.cadence.com X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:158.140.1.148; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:sjmaillnx2.cadence.com; PTR:unknown.Cadence.COM; CAT:NONE; SFTY:; SFS:(4636009)(136003)(396003)(39860400002)(376002)(346002)(36092001)(46966005)(86362001)(36906005)(110136005)(70206006)(70586007)(47076004)(2906002)(82740400003)(54906003)(8676002)(42186006)(316002)(5660300002)(186003)(426003)(8936002)(2616005)(7636003)(478600001)(82310400002)(4326008)(26005)(356005)(36756003)(107886003)(336012); DIR:OUT; SFP:1101; X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c7f3c9c0-daf8-4656-6dfa-08d7f824158e X-MS-TrafficTypeDiagnostic: DM6PR07MB6698: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org This patch fix following issues. 1. 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. Remaining devices are handled in DAA. 2. Since we alreay handled devices with init_dyn_addr, removed it's handling from i3c_master_add_i3c_dev_locked(). Now only case handled is devices already with dyn_addr participated in DAA, and again got new dyn_addr with an extra slot in the master controller. 3. Removed unnecessary i3c_master_reattach_i3c_dev() from i3c_master_add_i3c_dev_locked(), right away after finding if duplicate device exists in the I3C list. In case of different new and old dyn_addr i3c_master_reattach_i3c_dev() will fail which is wrong, and in case of same dyn_addr it doesn't add anything new. Fixes: 3a379bbcea0a ("i3c: Add core I3C infrastructure") Signed-off-by: Parshuram Thombare --- drivers/i3c/master.c | 111 ++++++++++++++++++------------------------- 1 file changed, 46 insertions(+), 65 deletions(-) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 5f4bd52121fe..f1d929b58549 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -1375,6 +1375,11 @@ static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev, i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, I3C_ADDR_SLOT_I3C_DEV); + + if (old_dyn_addr) + i3c_bus_set_addr_slot_status(&master->bus, + old_dyn_addr, + I3C_ADDR_SLOT_FREE); } if (master->ops->reattach_i3c_dev) { @@ -1426,33 +1431,52 @@ 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 void i3c_master_pre_assign_dyn_addr(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) + /* + * We anyway 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 (!boardinfo->static_addr || !boardinfo->init_dyn_addr) + return; + + i3cdev = i3c_master_alloc_i3c_dev(master, &info); + if (IS_ERR(i3cdev)) return; - 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; - 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_rstdaa; + goto err_setdasa; - ret = i3c_master_retrieve_dev_info(dev); + i3cdev->info.dyn_addr = i3cdev->boardinfo->init_dyn_addr; + ret = i3c_master_reattach_i3c_dev(i3cdev, 0); if (ret) goto err_rstdaa; - return; + ret = i3c_master_retrieve_dev_info(i3cdev); + if (ret) + goto err_rstdaa; 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); + i3c_master_free_i3c_dev(i3cdev); } static void @@ -1619,8 +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 @@ -1647,7 +1671,6 @@ 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 +1702,6 @@ 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 @@ -1746,8 +1741,8 @@ static int i3c_master_bus_init(struct i3c_master_controller *master) * Pre-assign dynamic address and retrieve device information if * needed. */ - i3c_bus_for_each_i3cdev(&master->bus, i3cdev) - i3c_master_pre_assign_dyn_addr(i3cdev); + list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) + i3c_master_pre_assign_dyn_addr(master, i3cboardinfo); ret = i3c_master_do_daa(master); if (ret) @@ -1811,7 +1806,7 @@ int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master, { struct i3c_device_info info = { .dyn_addr = addr }; struct i3c_dev_desc *newdev, *olddev; - u8 old_dyn_addr = addr, expected_dyn_addr; + u8 old_dyn_addr = addr; struct i3c_ibi_setup ibireq = { }; bool enable_ibi = false; int ret; @@ -1866,39 +1861,25 @@ int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master, i3c_master_free_i3c_dev(olddev); } - ret = i3c_master_reattach_i3c_dev(newdev, old_dyn_addr); - if (ret) - goto err_detach_dev; - /* * Depending on our previous state, the expected dynamic address might * differ: * - if the device already had a dynamic address assigned, let's try to - * re-apply this one - * - if the device did not have a dynamic address and the firmware - * requested a specific address, pick this one + * re-apply this one. Device with dyn_addr participated in DAA ? * - in any other case, keep the address automatically assigned by the * master */ - if (old_dyn_addr && old_dyn_addr != newdev->info.dyn_addr) - expected_dyn_addr = old_dyn_addr; - else if (newdev->boardinfo && newdev->boardinfo->init_dyn_addr) - expected_dyn_addr = newdev->boardinfo->init_dyn_addr; - else - expected_dyn_addr = newdev->info.dyn_addr; - - if (newdev->info.dyn_addr != expected_dyn_addr) { + if (old_dyn_addr && old_dyn_addr != newdev->info.dyn_addr) { /* * Try to apply the expected dynamic address. If it fails, keep * the address assigned by the master. */ ret = i3c_master_setnewda_locked(master, newdev->info.dyn_addr, - expected_dyn_addr); + old_dyn_addr); if (!ret) { - old_dyn_addr = newdev->info.dyn_addr; - newdev->info.dyn_addr = expected_dyn_addr; - i3c_master_reattach_i3c_dev(newdev, old_dyn_addr); + newdev->info.dyn_addr = old_dyn_addr; + i3c_master_reattach_i3c_dev(newdev, addr); } else { dev_err(&master->dev, "Failed to assign reserved/old address to device %d%llx", -- 2.17.1 _______________________________________________ linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c