From 63961f544e271db5f5d3a03164cbe28fcb7eba93 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 26 Jul 2021 15:11:32 -0500 Subject: [PATCH 1/5] net: ipa: kill ipa_modem_setup() The functions ipa_modem_setup() and ipa_modem_teardown() are trivial wrappers that call ipa_qmi_setup() and ipa_qmi_teardown(). Just call the QMI functions directly, and get rid of the wrappers. Improve the documentation of what setting up QMI does. Signed-off-by: Alex Elder Signed-off-by: David S. Miller --- drivers/net/ipa/ipa_main.c | 4 ++-- drivers/net/ipa/ipa_modem.c | 10 ---------- drivers/net/ipa/ipa_modem.h | 4 ---- drivers/net/ipa/ipa_qmi.c | 6 ++---- drivers/net/ipa/ipa_qmi.h | 19 +++++++++++++++++++ 5 files changed, 23 insertions(+), 20 deletions(-) diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c index 0567d726c5608..971987fd53d6a 100644 --- a/drivers/net/ipa/ipa_main.c +++ b/drivers/net/ipa/ipa_main.c @@ -167,7 +167,7 @@ int ipa_setup(struct ipa *ipa) ipa_endpoint_default_route_set(ipa, exception_endpoint->endpoint_id); /* We're all set. Now prepare for communication with the modem */ - ret = ipa_modem_setup(ipa); + ret = ipa_qmi_setup(ipa); if (ret) goto err_default_route_clear; @@ -204,7 +204,7 @@ static void ipa_teardown(struct ipa *ipa) struct ipa_endpoint *exception_endpoint; struct ipa_endpoint *command_endpoint; - ipa_modem_teardown(ipa); + ipa_qmi_teardown(ipa); ipa_endpoint_default_route_clear(ipa); exception_endpoint = ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]; ipa_endpoint_disable_one(exception_endpoint); diff --git a/drivers/net/ipa/ipa_modem.c b/drivers/net/ipa/ipa_modem.c index af9aedbde717a..5cb60e2ea6042 100644 --- a/drivers/net/ipa/ipa_modem.c +++ b/drivers/net/ipa/ipa_modem.c @@ -377,13 +377,3 @@ void ipa_modem_deconfig(struct ipa *ipa) ipa->notifier = NULL; memset(&ipa->nb, 0, sizeof(ipa->nb)); } - -int ipa_modem_setup(struct ipa *ipa) -{ - return ipa_qmi_setup(ipa); -} - -void ipa_modem_teardown(struct ipa *ipa) -{ - ipa_qmi_teardown(ipa); -} diff --git a/drivers/net/ipa/ipa_modem.h b/drivers/net/ipa/ipa_modem.h index 2de3e216d1d43..5e6e3d234454a 100644 --- a/drivers/net/ipa/ipa_modem.h +++ b/drivers/net/ipa/ipa_modem.h @@ -7,7 +7,6 @@ #define _IPA_MODEM_H_ struct ipa; -struct ipa_endpoint; struct net_device; struct sk_buff; @@ -25,7 +24,4 @@ void ipa_modem_exit(struct ipa *ipa); int ipa_modem_config(struct ipa *ipa); void ipa_modem_deconfig(struct ipa *ipa); -int ipa_modem_setup(struct ipa *ipa); -void ipa_modem_teardown(struct ipa *ipa); - #endif /* _IPA_MODEM_H_ */ diff --git a/drivers/net/ipa/ipa_qmi.c b/drivers/net/ipa/ipa_qmi.c index 4661105ce7ab2..90f3aec55b365 100644 --- a/drivers/net/ipa/ipa_qmi.c +++ b/drivers/net/ipa/ipa_qmi.c @@ -467,10 +467,7 @@ static const struct qmi_ops ipa_client_ops = { .new_server = ipa_client_new_server, }; -/* This is called by ipa_setup(). We can be informed via remoteproc that - * the modem has shut down, in which case this function will be called - * again to prepare for it coming back up again. - */ +/* Set up for QMI message exchange */ int ipa_qmi_setup(struct ipa *ipa) { struct ipa_qmi *ipa_qmi = &ipa->qmi; @@ -526,6 +523,7 @@ int ipa_qmi_setup(struct ipa *ipa) return ret; } +/* Tear down IPA QMI handles */ void ipa_qmi_teardown(struct ipa *ipa) { cancel_work_sync(&ipa->qmi.init_driver_work); diff --git a/drivers/net/ipa/ipa_qmi.h b/drivers/net/ipa/ipa_qmi.h index b6f2055d35a68..856ef629ccc8d 100644 --- a/drivers/net/ipa/ipa_qmi.h +++ b/drivers/net/ipa/ipa_qmi.h @@ -39,7 +39,26 @@ struct ipa_qmi { bool indication_sent; }; +/** + * ipa_qmi_setup() - Set up for QMI message exchange + * @ipa: IPA pointer + * + * This is called at the end of ipa_setup(), to prepare for the exchange + * of QMI messages that perform a "handshake" between the AP and modem. + * When the modem QMI server announces its presence, an AP request message + * supplies operating parameters to be used to the modem, and the modem + * acknowledges receipt of those parameters. The modem will not touch the + * IPA hardware until this handshake is complete. + * + * If the modem crashes (or shuts down) a new handshake begins when the + * modem's QMI server is started again. + */ int ipa_qmi_setup(struct ipa *ipa); + +/** + * ipa_qmi_teardown() - Tear down IPA QMI handles + * @ipa: IPA pointer + */ void ipa_qmi_teardown(struct ipa *ipa); #endif /* !_IPA_QMI_H_ */ From 07e1f6897f735296aeff6c135cb8ddb4040a3e20 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 26 Jul 2021 15:11:33 -0500 Subject: [PATCH 2/5] net: ipa: configure memory regions early IPA-resident memory is one of the most primitive resources that needs initialization, so call init_mem_config() early in ipa_config(). This is in preparation for initializing the IPA-resident microcontroller earlier. Signed-off-by: Alex Elder Signed-off-by: David S. Miller --- drivers/net/ipa/ipa_main.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c index 971987fd53d6a..47ed96dd49ab4 100644 --- a/drivers/net/ipa/ipa_main.c +++ b/drivers/net/ipa/ipa_main.c @@ -468,31 +468,31 @@ static int ipa_config(struct ipa *ipa, const struct ipa_data *data) ipa_hardware_config(ipa, data); - ret = ipa_endpoint_config(ipa); + ret = ipa_mem_config(ipa); if (ret) goto err_hardware_deconfig; - ret = ipa_mem_config(ipa); + ret = ipa_endpoint_config(ipa); if (ret) - goto err_endpoint_deconfig; + goto err_mem_deconfig; ipa_table_config(ipa); /* No deconfig required */ /* Assign resource limitation to each group; no deconfig required */ ret = ipa_resource_config(ipa, data->resource_data); if (ret) - goto err_mem_deconfig; + goto err_endpoint_deconfig; ret = ipa_modem_config(ipa); if (ret) - goto err_mem_deconfig; + goto err_endpoint_deconfig; return 0; -err_mem_deconfig: - ipa_mem_deconfig(ipa); err_endpoint_deconfig: ipa_endpoint_deconfig(ipa); +err_mem_deconfig: + ipa_mem_deconfig(ipa); err_hardware_deconfig: ipa_hardware_deconfig(ipa); ipa_clock_put(ipa); @@ -507,8 +507,8 @@ static int ipa_config(struct ipa *ipa, const struct ipa_data *data) static void ipa_deconfig(struct ipa *ipa) { ipa_modem_deconfig(ipa); - ipa_mem_deconfig(ipa); ipa_endpoint_deconfig(ipa); + ipa_mem_deconfig(ipa); ipa_hardware_deconfig(ipa); ipa_clock_put(ipa); } From 1118a14710ee97292c52e0185d12caa3eb17ad55 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 26 Jul 2021 15:11:34 -0500 Subject: [PATCH 3/5] net: ipa: set up IPA interrupts earlier Initialization of the IPA driver has several phases: - "init" phase can be done without any access to IPA hardware - "config" phase requires the IPA hardware to be clocked - "setup" phase requires the GSI layer to be functional Currently, initialization for the IPA interrupt handling code occurs in the setup phase. It requires access to the IPA hardware but does not need GSI, so it can be moved to the config phase instead. Call the interrupt configuration function early in ipa_config() rather than from ipa_setup(). Rename ipa_interrupt_setup() to be ipa_interrupt_config(), and ipa_interrupt_teardown() to be ipa_interupt_deconfig(), so their names properly indicate when they get called. Signed-off-by: Alex Elder Signed-off-by: David S. Miller --- drivers/net/ipa/ipa_interrupt.c | 8 ++++---- drivers/net/ipa/ipa_interrupt.h | 8 ++++---- drivers/net/ipa/ipa_main.c | 22 +++++++++++++--------- 3 files changed, 21 insertions(+), 17 deletions(-) diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c index e792bc3be5766..9fd158dd90473 100644 --- a/drivers/net/ipa/ipa_interrupt.c +++ b/drivers/net/ipa/ipa_interrupt.c @@ -233,8 +233,8 @@ ipa_interrupt_remove(struct ipa_interrupt *interrupt, enum ipa_irq_id ipa_irq) interrupt->handler[ipa_irq] = NULL; } -/* Set up the IPA interrupt framework */ -struct ipa_interrupt *ipa_interrupt_setup(struct ipa *ipa) +/* Configure the IPA interrupt framework */ +struct ipa_interrupt *ipa_interrupt_config(struct ipa *ipa) { struct device *dev = &ipa->pdev->dev; struct ipa_interrupt *interrupt; @@ -283,8 +283,8 @@ struct ipa_interrupt *ipa_interrupt_setup(struct ipa *ipa) return ERR_PTR(ret); } -/* Tear down the IPA interrupt framework */ -void ipa_interrupt_teardown(struct ipa_interrupt *interrupt) +/* Inverse of ipa_interrupt_config() */ +void ipa_interrupt_deconfig(struct ipa_interrupt *interrupt) { struct device *dev = &interrupt->ipa->pdev->dev; int ret; diff --git a/drivers/net/ipa/ipa_interrupt.h b/drivers/net/ipa/ipa_interrupt.h index d5c486a6800d9..231390cea52a2 100644 --- a/drivers/net/ipa/ipa_interrupt.h +++ b/drivers/net/ipa/ipa_interrupt.h @@ -86,17 +86,17 @@ void ipa_interrupt_suspend_clear_all(struct ipa_interrupt *interrupt); void ipa_interrupt_simulate_suspend(struct ipa_interrupt *interrupt); /** - * ipa_interrupt_setup() - Set up the IPA interrupt framework + * ipa_interrupt_config() - Configure the IPA interrupt framework * @ipa: IPA pointer * * Return: Pointer to IPA SMP2P info, or a pointer-coded error */ -struct ipa_interrupt *ipa_interrupt_setup(struct ipa *ipa); +struct ipa_interrupt *ipa_interrupt_config(struct ipa *ipa); /** - * ipa_interrupt_teardown() - Tear down the IPA interrupt framework + * ipa_interrupt_deconfig() - Inverse of ipa_interrupt_config() * @interrupt: IPA interrupt structure */ -void ipa_interrupt_teardown(struct ipa_interrupt *interrupt); +void ipa_interrupt_deconfig(struct ipa_interrupt *interrupt); #endif /* _IPA_INTERRUPT_H_ */ diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c index 47ed96dd49ab4..1c501fcea0c31 100644 --- a/drivers/net/ipa/ipa_main.c +++ b/drivers/net/ipa/ipa_main.c @@ -124,11 +124,6 @@ int ipa_setup(struct ipa *ipa) if (ret) return ret; - ipa->interrupt = ipa_interrupt_setup(ipa); - if (IS_ERR(ipa->interrupt)) { - ret = PTR_ERR(ipa->interrupt); - goto err_gsi_teardown; - } ipa_interrupt_add(ipa->interrupt, IPA_IRQ_TX_SUSPEND, ipa_suspend_handler); @@ -188,8 +183,6 @@ int ipa_setup(struct ipa *ipa) err_uc_teardown: ipa_uc_teardown(ipa); ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND); - ipa_interrupt_teardown(ipa->interrupt); -err_gsi_teardown: gsi_teardown(&ipa->gsi); return ret; @@ -214,7 +207,6 @@ static void ipa_teardown(struct ipa *ipa) (void)device_init_wakeup(&ipa->pdev->dev, false); ipa_uc_teardown(ipa); ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND); - ipa_interrupt_teardown(ipa->interrupt); gsi_teardown(&ipa->gsi); } @@ -472,9 +464,16 @@ static int ipa_config(struct ipa *ipa, const struct ipa_data *data) if (ret) goto err_hardware_deconfig; + ipa->interrupt = ipa_interrupt_config(ipa); + if (IS_ERR(ipa->interrupt)) { + ret = PTR_ERR(ipa->interrupt); + ipa->interrupt = NULL; + goto err_mem_deconfig; + } + ret = ipa_endpoint_config(ipa); if (ret) - goto err_mem_deconfig; + goto err_interrupt_deconfig; ipa_table_config(ipa); /* No deconfig required */ @@ -491,6 +490,9 @@ static int ipa_config(struct ipa *ipa, const struct ipa_data *data) err_endpoint_deconfig: ipa_endpoint_deconfig(ipa); +err_interrupt_deconfig: + ipa_interrupt_deconfig(ipa->interrupt); + ipa->interrupt = NULL; err_mem_deconfig: ipa_mem_deconfig(ipa); err_hardware_deconfig: @@ -508,6 +510,8 @@ static void ipa_deconfig(struct ipa *ipa) { ipa_modem_deconfig(ipa); ipa_endpoint_deconfig(ipa); + ipa_interrupt_deconfig(ipa->interrupt); + ipa->interrupt = NULL; ipa_mem_deconfig(ipa); ipa_hardware_deconfig(ipa); ipa_clock_put(ipa); From dc8f7e3924a99515d8c3d3dbd905ad1327ac37b6 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 26 Jul 2021 15:11:35 -0500 Subject: [PATCH 4/5] net: ipa: set up the microcontroller earlier Initializing up the IPA-resident microcontroller requires the IPA clock, and sets up two IPA interrupt handlers, but this does not require GSI access. The interrupt handlers also require the clock to be enabled, and require the IPA memory regions to be configured, but neither requires GSI access. As a result, the microcontroller can be initialized during the "config" rather than "setup" phase of IPA initialization. Initialize the microcontroller in ipa_config() rather than ipa_setup(), and rename the called function ipa_uc_config(). Do the inverse in ipa_deconfig() rather than ipa_teardown(), and rename the function for that case ipa_uc_deconfig(). Signed-off-by: Alex Elder Signed-off-by: David S. Miller --- drivers/net/ipa/ipa_main.c | 12 ++++++------ drivers/net/ipa/ipa_uc.c | 8 ++++---- drivers/net/ipa/ipa_uc.h | 8 ++++---- 3 files changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c index 1c501fcea0c31..5bcc6cd13a9a0 100644 --- a/drivers/net/ipa/ipa_main.c +++ b/drivers/net/ipa/ipa_main.c @@ -127,11 +127,9 @@ int ipa_setup(struct ipa *ipa) ipa_interrupt_add(ipa->interrupt, IPA_IRQ_TX_SUSPEND, ipa_suspend_handler); - ipa_uc_setup(ipa); - ret = device_init_wakeup(dev, true); if (ret) - goto err_uc_teardown; + goto err_interrupt_remove; ipa_endpoint_setup(ipa); @@ -180,8 +178,7 @@ int ipa_setup(struct ipa *ipa) err_endpoint_teardown: ipa_endpoint_teardown(ipa); (void)device_init_wakeup(dev, false); -err_uc_teardown: - ipa_uc_teardown(ipa); +err_interrupt_remove: ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND); gsi_teardown(&ipa->gsi); @@ -205,7 +202,6 @@ static void ipa_teardown(struct ipa *ipa) ipa_endpoint_disable_one(command_endpoint); ipa_endpoint_teardown(ipa); (void)device_init_wakeup(&ipa->pdev->dev, false); - ipa_uc_teardown(ipa); ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND); gsi_teardown(&ipa->gsi); } @@ -471,6 +467,8 @@ static int ipa_config(struct ipa *ipa, const struct ipa_data *data) goto err_mem_deconfig; } + ipa_uc_config(ipa); + ret = ipa_endpoint_config(ipa); if (ret) goto err_interrupt_deconfig; @@ -491,6 +489,7 @@ static int ipa_config(struct ipa *ipa, const struct ipa_data *data) err_endpoint_deconfig: ipa_endpoint_deconfig(ipa); err_interrupt_deconfig: + ipa_uc_deconfig(ipa); ipa_interrupt_deconfig(ipa->interrupt); ipa->interrupt = NULL; err_mem_deconfig: @@ -510,6 +509,7 @@ static void ipa_deconfig(struct ipa *ipa) { ipa_modem_deconfig(ipa); ipa_endpoint_deconfig(ipa); + ipa_uc_deconfig(ipa); ipa_interrupt_deconfig(ipa->interrupt); ipa->interrupt = NULL; ipa_mem_deconfig(ipa); diff --git a/drivers/net/ipa/ipa_uc.c b/drivers/net/ipa/ipa_uc.c index fd9219863234c..8b5e75711b644 100644 --- a/drivers/net/ipa/ipa_uc.c +++ b/drivers/net/ipa/ipa_uc.c @@ -162,8 +162,8 @@ static void ipa_uc_response_hdlr(struct ipa *ipa, enum ipa_irq_id irq_id) } } -/* ipa_uc_setup() - Set up the microcontroller */ -void ipa_uc_setup(struct ipa *ipa) +/* Configure the IPA microcontroller subsystem */ +void ipa_uc_config(struct ipa *ipa) { /* The microcontroller needs the IPA clock running until it has * completed its initialization. It signals this by sending an @@ -180,8 +180,8 @@ void ipa_uc_setup(struct ipa *ipa) ipa_interrupt_add(ipa->interrupt, IPA_IRQ_UC_1, ipa_uc_response_hdlr); } -/* Inverse of ipa_uc_setup() */ -void ipa_uc_teardown(struct ipa *ipa) +/* Inverse of ipa_uc_config() */ +void ipa_uc_deconfig(struct ipa *ipa) { ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_1); ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_0); diff --git a/drivers/net/ipa/ipa_uc.h b/drivers/net/ipa/ipa_uc.h index e8510899a3f0a..cb0a224022f58 100644 --- a/drivers/net/ipa/ipa_uc.h +++ b/drivers/net/ipa/ipa_uc.h @@ -9,16 +9,16 @@ struct ipa; /** - * ipa_uc_setup() - set up the IPA microcontroller subsystem + * ipa_uc_config() - Configure the IPA microcontroller subsystem * @ipa: IPA pointer */ -void ipa_uc_setup(struct ipa *ipa); +void ipa_uc_config(struct ipa *ipa); /** - * ipa_uc_teardown() - inverse of ipa_uc_setup() + * ipa_uc_deconfig() - Inverse of ipa_uc_config() * @ipa: IPA pointer */ -void ipa_uc_teardown(struct ipa *ipa); +void ipa_uc_deconfig(struct ipa *ipa); /** * ipa_uc_panic_notifier() From e2f154e6b601fb25344ae244834de19881edb289 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 26 Jul 2021 15:11:36 -0500 Subject: [PATCH 5/5] net: ipa: introduce ipa_uc_clock() The first time it's booted, the modem loads and starts the IPA-resident microcontroller. Once the microcontroller has completed its initialization, it notifies the AP it's "ready" by sending an INIT_COMPLETED response message. Until it receives that microcontroller message, the AP must ensure the IPA core clock remains operational. Currently, a "proxy" clock reference is taken in ipa_uc_config(), dropping it again once the message is received. However there could be a long delay between when ipa_config() completes and when modem actually starts. And because the microcontroller gets loaded by the modem, there's no need to get the modem "proxy clock" until the first time it starts. Create a new function ipa_uc_clock() which takes the "proxy" clock reference for the microcontroller. Call it when we get remoteproc SSR notification that the modem is about to start. Keep an additional flag to record whether this proxy clock reference needs to be dropped at shutdown time, and issue a warning if we get the microcontroller message either before the clock reference is taken, or after it has already been dropped. Drop the nearby use of "hh" length modifiers, which are no longer encouraged in the kernel. Signed-off-by: Alex Elder Signed-off-by: David S. Miller --- drivers/net/ipa/ipa.h | 2 ++ drivers/net/ipa/ipa_modem.c | 2 ++ drivers/net/ipa/ipa_uc.c | 44 +++++++++++++++++++++++-------------- drivers/net/ipa/ipa_uc.h | 14 ++++++++++++ 4 files changed, 45 insertions(+), 17 deletions(-) diff --git a/drivers/net/ipa/ipa.h b/drivers/net/ipa/ipa.h index 744406832a774..71ba996096bb9 100644 --- a/drivers/net/ipa/ipa.h +++ b/drivers/net/ipa/ipa.h @@ -51,6 +51,7 @@ enum ipa_flag { * @table_addr: DMA address of filter/route table content * @table_virt: Virtual address of filter/route table content * @interrupt: IPA Interrupt information + * @uc_clocked: true if clock is active by proxy for microcontroller * @uc_loaded: true after microcontroller has reported it's ready * @reg_addr: DMA address used for IPA register access * @reg_virt: Virtual address used for IPA register access @@ -95,6 +96,7 @@ struct ipa { __le64 *table_virt; struct ipa_interrupt *interrupt; + bool uc_clocked; bool uc_loaded; dma_addr_t reg_addr; diff --git a/drivers/net/ipa/ipa_modem.c b/drivers/net/ipa/ipa_modem.c index 5cb60e2ea6042..c851e2cf12552 100644 --- a/drivers/net/ipa/ipa_modem.c +++ b/drivers/net/ipa/ipa_modem.c @@ -19,6 +19,7 @@ #include "ipa_modem.h" #include "ipa_smp2p.h" #include "ipa_qmi.h" +#include "ipa_uc.h" #define IPA_NETDEV_NAME "rmnet_ipa%d" #define IPA_NETDEV_TAILROOM 0 /* for padding by mux layer */ @@ -314,6 +315,7 @@ static int ipa_modem_notify(struct notifier_block *nb, unsigned long action, switch (action) { case QCOM_SSR_BEFORE_POWERUP: dev_info(dev, "received modem starting event\n"); + ipa_uc_clock(ipa); ipa_smp2p_notify_reset(ipa); break; diff --git a/drivers/net/ipa/ipa_uc.c b/drivers/net/ipa/ipa_uc.c index 8b5e75711b644..f88ee02457d49 100644 --- a/drivers/net/ipa/ipa_uc.c +++ b/drivers/net/ipa/ipa_uc.c @@ -131,7 +131,7 @@ static void ipa_uc_event_handler(struct ipa *ipa, enum ipa_irq_id irq_id) if (shared->event == IPA_UC_EVENT_ERROR) dev_err(dev, "microcontroller error event\n"); else if (shared->event != IPA_UC_EVENT_LOG_INFO) - dev_err(dev, "unsupported microcontroller event %hhu\n", + dev_err(dev, "unsupported microcontroller event %u\n", shared->event); /* The LOG_INFO event can be safely ignored */ } @@ -140,23 +140,28 @@ static void ipa_uc_event_handler(struct ipa *ipa, enum ipa_irq_id irq_id) static void ipa_uc_response_hdlr(struct ipa *ipa, enum ipa_irq_id irq_id) { struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa); + struct device *dev = &ipa->pdev->dev; /* An INIT_COMPLETED response message is sent to the AP by the * microcontroller when it is operational. Other than this, the AP * should only receive responses from the microcontroller when it has * sent it a request message. * - * We can drop the clock reference taken in ipa_uc_setup() once we + * We can drop the clock reference taken in ipa_uc_clock() once we * know the microcontroller has finished its initialization. */ switch (shared->response) { case IPA_UC_RESPONSE_INIT_COMPLETED: - ipa->uc_loaded = true; - ipa_clock_put(ipa); + if (ipa->uc_clocked) { + ipa->uc_loaded = true; + ipa_clock_put(ipa); + ipa->uc_clocked = false; + } else { + dev_warn(dev, "unexpected init_completed response\n"); + } break; default: - dev_warn(&ipa->pdev->dev, - "unsupported microcontroller response %hhu\n", + dev_warn(dev, "unsupported microcontroller response %u\n", shared->response); break; } @@ -165,16 +170,7 @@ static void ipa_uc_response_hdlr(struct ipa *ipa, enum ipa_irq_id irq_id) /* Configure the IPA microcontroller subsystem */ void ipa_uc_config(struct ipa *ipa) { - /* The microcontroller needs the IPA clock running until it has - * completed its initialization. It signals this by sending an - * INIT_COMPLETED response message to the AP. This could occur after - * we have finished doing the rest of the IPA initialization, so we - * need to take an extra "proxy" reference, and hold it until we've - * received that signal. (This reference is dropped in - * ipa_uc_response_hdlr(), above.) - */ - ipa_clock_get(ipa); - + ipa->uc_clocked = false; ipa->uc_loaded = false; ipa_interrupt_add(ipa->interrupt, IPA_IRQ_UC_0, ipa_uc_event_handler); ipa_interrupt_add(ipa->interrupt, IPA_IRQ_UC_1, ipa_uc_response_hdlr); @@ -185,10 +181,24 @@ void ipa_uc_deconfig(struct ipa *ipa) { ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_1); ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_0); - if (!ipa->uc_loaded) + if (ipa->uc_clocked) ipa_clock_put(ipa); } +/* Take a proxy clock reference for the microcontroller */ +void ipa_uc_clock(struct ipa *ipa) +{ + static bool already; + + if (already) + return; + already = true; /* Only do this on first boot */ + + /* This clock reference dropped in ipa_uc_response_hdlr() above */ + ipa_clock_get(ipa); + ipa->uc_clocked = true; +} + /* Send a command to the microcontroller */ static void send_uc_command(struct ipa *ipa, u32 command, u32 command_param) { diff --git a/drivers/net/ipa/ipa_uc.h b/drivers/net/ipa/ipa_uc.h index cb0a224022f58..14e4e1115aa79 100644 --- a/drivers/net/ipa/ipa_uc.h +++ b/drivers/net/ipa/ipa_uc.h @@ -20,6 +20,20 @@ void ipa_uc_config(struct ipa *ipa); */ void ipa_uc_deconfig(struct ipa *ipa); +/** + * ipa_uc_clock() - Take a proxy clock reference for the microcontroller + * @ipa: IPA pointer + * + * The first time the modem boots, it loads firmware for and starts the + * IPA-resident microcontroller. The microcontroller signals that it + * has completed its initialization by sending an INIT_COMPLETED response + * message to the AP. The AP must ensure the IPA core clock is operating + * until it receives this message, and to do so we take a "proxy" clock + * reference on its behalf here. Once we receive the INIT_COMPLETED + * message (in ipa_uc_response_hdlr()) we drop this clock reference. + */ +void ipa_uc_clock(struct ipa *ipa); + /** * ipa_uc_panic_notifier() * @ipa: IPA pointer