From 55b644fd2431cfd28d04cc28f092d49e7bea3433 Mon Sep 17 00:00:00 2001 From: Martin Blumenstingl Date: Sat, 6 May 2017 19:37:45 +0200 Subject: usb: dwc2: add support for the DWC2 controller on Meson8 SoCs USB support in the Meson8 SoCs is provided by a DWC2 controller which works with the same settings as Meson8b and GXBB. Using the generic "snps,dwc2" binding results in an endless stream of "Overcurrent change detected" messages. Acked-by: Rob Herring Signed-off-by: Martin Blumenstingl Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/params.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/usb') diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c index 9cd8722f24f6..a3ffe97170ff 100644 --- a/drivers/usb/dwc2/params.c +++ b/drivers/usb/dwc2/params.c @@ -144,6 +144,8 @@ const struct of_device_id dwc2_of_match_table[] = { { .compatible = "lantiq,xrx200-usb", .data = dwc2_set_ltq_params }, { .compatible = "snps,dwc2" }, { .compatible = "samsung,s3c6400-hsotg" }, + { .compatible = "amlogic,meson8-usb", + .data = dwc2_set_amlogic_params }, { .compatible = "amlogic,meson8b-usb", .data = dwc2_set_amlogic_params }, { .compatible = "amlogic,meson-gxbb-usb", -- cgit v1.2.3 From dc9217b69dd6089dcfeb86ed4b3c671504326087 Mon Sep 17 00:00:00 2001 From: Thinh Nguyen Date: Thu, 11 May 2017 17:26:48 -0700 Subject: usb: gadget: f_mass_storage: Serialize wake and sleep execution f_mass_storage has a memorry barrier issue with the sleep and wake functions that can cause a deadlock. This results in intermittent hangs during MSC file transfer. The host will reset the device after receiving no response to resume the transfer. This issue is seen when dwc3 is processing 2 transfer-in-progress events at the same time, invoking completion handlers for CSW and CBW. Also this issue occurs depending on the system timing and latency. To increase the chance to hit this issue, you can force dwc3 driver to wait and process those 2 events at once by adding a small delay (~100us) in dwc3_check_event_buf() whenever the request is for CSW and read the event count again. Avoid debugging with printk and ftrace as extra delays and memory barrier will mask this issue. Scenario which can lead to failure: ----------------------------------- 1) The main thread sleeps and waits for the next command in get_next_command(). 2) bulk_in_complete() wakes up main thread for CSW. 3) bulk_out_complete() tries to wake up the running main thread for CBW. 4) thread_wakeup_needed is not loaded with correct value in sleep_thread(). 5) Main thread goes to sleep again. The pattern is shown below. Note the 2 critical variables. * common->thread_wakeup_needed * bh->state CPU 0 (sleep_thread) CPU 1 (wakeup_thread) ============================== =============================== bh->state = BH_STATE_FULL; smp_wmb(); thread_wakeup_needed = 0; thread_wakeup_needed = 1; smp_rmb(); if (bh->state != BH_STATE_FULL) sleep again ... As pointed out by Alan Stern, this is an R-pattern issue. The issue can be seen when there are two wakeups in quick succession. The thread_wakeup_needed can be overwritten in sleep_thread, and the read of the bh->state maybe reordered before the write to thread_wakeup_needed. This patch applies full memory barrier smp_mb() in both sleep_thread() and wakeup_thread() to ensure the order which the thread_wakeup_needed and bh->state are written and loaded. However, a better solution in the future would be to use wait_queue method that takes care of managing memory barrier between waker and waiter. Cc: Acked-by: Alan Stern Signed-off-by: Thinh Nguyen Signed-off-by: Felipe Balbi --- drivers/usb/gadget/function/f_mass_storage.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'drivers/usb') diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c index 4c8aacc232c0..74d57d6994da 100644 --- a/drivers/usb/gadget/function/f_mass_storage.c +++ b/drivers/usb/gadget/function/f_mass_storage.c @@ -396,7 +396,11 @@ static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep) /* Caller must hold fsg->lock */ static void wakeup_thread(struct fsg_common *common) { - smp_wmb(); /* ensure the write of bh->state is complete */ + /* + * Ensure the reading of thread_wakeup_needed + * and the writing of bh->state are completed + */ + smp_mb(); /* Tell the main thread that something has happened */ common->thread_wakeup_needed = 1; if (common->thread_task) @@ -627,7 +631,12 @@ static int sleep_thread(struct fsg_common *common, bool can_freeze) } __set_current_state(TASK_RUNNING); common->thread_wakeup_needed = 0; - smp_rmb(); /* ensure the latest bh->state is visible */ + + /* + * Ensure the writing of thread_wakeup_needed + * and the reading of bh->state are completed + */ + smp_mb(); return rc; } -- cgit v1.2.3 From cdc876877ebc3f0677b267756d4564e2a429e730 Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Wed, 26 Apr 2017 20:50:07 +0900 Subject: usb: gadget: udc: renesas_usb3: fix pm_runtime functions calling This patch fixes an issue that this driver is possible to access the registers before pm_runtime_get_sync() if a gadget driver is installed first. After that, oops happens on R-Car Gen3 environment. To avoid it, this patch changes the pm_runtime call timing from probe/remove to udc_start/udc_stop. Fixes: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller") Signed-off-by: Yoshihiro Shimoda Signed-off-by: Felipe Balbi --- drivers/usb/gadget/udc/renesas_usb3.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'drivers/usb') diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c index 5a2d845fb1a6..10585da8e360 100644 --- a/drivers/usb/gadget/udc/renesas_usb3.c +++ b/drivers/usb/gadget/udc/renesas_usb3.c @@ -1799,6 +1799,9 @@ static int renesas_usb3_start(struct usb_gadget *gadget, /* hook up the driver */ usb3->driver = driver; + pm_runtime_enable(usb3_to_dev(usb3)); + pm_runtime_get_sync(usb3_to_dev(usb3)); + renesas_usb3_init_controller(usb3); return 0; @@ -1816,6 +1819,9 @@ static int renesas_usb3_stop(struct usb_gadget *gadget) renesas_usb3_stop_controller(usb3); spin_unlock_irqrestore(&usb3->lock, flags); + pm_runtime_put(usb3_to_dev(usb3)); + pm_runtime_disable(usb3_to_dev(usb3)); + return 0; } @@ -1891,9 +1897,6 @@ static int renesas_usb3_remove(struct platform_device *pdev) device_remove_file(&pdev->dev, &dev_attr_role); - pm_runtime_put(&pdev->dev); - pm_runtime_disable(&pdev->dev); - usb_del_gadget_udc(&usb3->gadget); __renesas_usb3_ep_free_request(usb3->ep0_req); @@ -2099,9 +2102,6 @@ static int renesas_usb3_probe(struct platform_device *pdev) usb3->workaround_for_vbus = priv->workaround_for_vbus; - pm_runtime_enable(&pdev->dev); - pm_runtime_get_sync(&pdev->dev); - dev_info(&pdev->dev, "probed\n"); return 0; -- cgit v1.2.3 From 067d6fdc558d2c43f0bfdc7af99630dd5eb08dc5 Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Wed, 26 Apr 2017 20:50:08 +0900 Subject: usb: gadget: udc: renesas_usb3: fix deadlock by spinlock This patch fixes an issue that this driver is possible to cause deadlock by double-spinclocked in renesas_usb3_stop_controller(). So, this patch removes spinlock API calling in renesas_usb3_stop(). (In other words, the previous code had a redundant lock.) Fixes: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller") Signed-off-by: Yoshihiro Shimoda Signed-off-by: Felipe Balbi --- drivers/usb/gadget/udc/renesas_usb3.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'drivers/usb') diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c index 10585da8e360..e27d948617e2 100644 --- a/drivers/usb/gadget/udc/renesas_usb3.c +++ b/drivers/usb/gadget/udc/renesas_usb3.c @@ -1810,14 +1810,11 @@ static int renesas_usb3_start(struct usb_gadget *gadget, static int renesas_usb3_stop(struct usb_gadget *gadget) { struct renesas_usb3 *usb3 = gadget_to_renesas_usb3(gadget); - unsigned long flags; - spin_lock_irqsave(&usb3->lock, flags); usb3->softconnect = false; usb3->gadget.speed = USB_SPEED_UNKNOWN; usb3->driver = NULL; renesas_usb3_stop_controller(usb3); - spin_unlock_irqrestore(&usb3->lock, flags); pm_runtime_put(usb3_to_dev(usb3)); pm_runtime_disable(usb3_to_dev(usb3)); -- cgit v1.2.3 From 940f538a100c84c6e72813e4ac88bd1753a86945 Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Wed, 26 Apr 2017 20:50:09 +0900 Subject: usb: gadget: udc: renesas_usb3: lock for PN_ registers access This controller disallows to change the PIPE until reading/writing a packet finishes. However. the previous code is not enough to hold the lock in some functions. So, this patch fixes it. Fixes: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller") Signed-off-by: Yoshihiro Shimoda Signed-off-by: Felipe Balbi --- drivers/usb/gadget/udc/renesas_usb3.c | 28 +++++++++++++++++++++++++--- 1 file changed, 25 insertions(+), 3 deletions(-) (limited to 'drivers/usb') diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c index e27d948617e2..c05097b5661e 100644 --- a/drivers/usb/gadget/udc/renesas_usb3.c +++ b/drivers/usb/gadget/udc/renesas_usb3.c @@ -1475,7 +1475,13 @@ static void usb3_request_done_pipen(struct renesas_usb3 *usb3, struct renesas_usb3_request *usb3_req, int status) { - usb3_pn_stop(usb3); + unsigned long flags; + + spin_lock_irqsave(&usb3->lock, flags); + if (usb3_pn_change(usb3, usb3_ep->num)) + usb3_pn_stop(usb3); + spin_unlock_irqrestore(&usb3->lock, flags); + usb3_disable_pipe_irq(usb3, usb3_ep->num); usb3_request_done(usb3_ep, usb3_req, status); @@ -1504,30 +1510,46 @@ static void usb3_irq_epc_pipen_bfrdy(struct renesas_usb3 *usb3, int num) { struct renesas_usb3_ep *usb3_ep = usb3_get_ep(usb3, num); struct renesas_usb3_request *usb3_req = usb3_get_request(usb3_ep); + bool done = false; if (!usb3_req) return; + spin_lock(&usb3->lock); + if (usb3_pn_change(usb3, num)) + goto out; + if (usb3_ep->dir_in) { /* Do not stop the IN pipe here to detect LSTTR interrupt */ if (!usb3_write_pipe(usb3_ep, usb3_req, USB3_PN_WRITE)) usb3_clear_bit(usb3, PN_INT_BFRDY, USB3_PN_INT_ENA); } else { if (!usb3_read_pipe(usb3_ep, usb3_req, USB3_PN_READ)) - usb3_request_done_pipen(usb3, usb3_ep, usb3_req, 0); + done = true; } + +out: + /* need to unlock because usb3_request_done_pipen() locks it */ + spin_unlock(&usb3->lock); + + if (done) + usb3_request_done_pipen(usb3, usb3_ep, usb3_req, 0); } static void usb3_irq_epc_pipen(struct renesas_usb3 *usb3, int num) { u32 pn_int_sta; - if (usb3_pn_change(usb3, num) < 0) + spin_lock(&usb3->lock); + if (usb3_pn_change(usb3, num) < 0) { + spin_unlock(&usb3->lock); return; + } pn_int_sta = usb3_read(usb3, USB3_PN_INT_STA); pn_int_sta &= usb3_read(usb3, USB3_PN_INT_ENA); usb3_write(usb3, pn_int_sta, USB3_PN_INT_STA); + spin_unlock(&usb3->lock); if (pn_int_sta & PN_INT_LSTTR) usb3_irq_epc_pipen_lsttr(usb3, num); if (pn_int_sta & PN_INT_BFRDY) -- cgit v1.2.3 From afbbc7913a288c29616bd31ae612548f6475151a Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Wed, 26 Apr 2017 20:50:10 +0900 Subject: usb: gadget: udc: renesas_usb3: Fix PN_INT_ENA disabling timing The PN_INT_ENA register should be used after usb3_pn_change() is called. So, this patch moves the access from renesas_usb3_stop_controller() to usb3_disable_pipe_n(). Fixes: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller") Signed-off-by: Yoshihiro Shimoda Signed-off-by: Felipe Balbi --- drivers/usb/gadget/udc/renesas_usb3.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/usb') diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c index c05097b5661e..cd4c88529721 100644 --- a/drivers/usb/gadget/udc/renesas_usb3.c +++ b/drivers/usb/gadget/udc/renesas_usb3.c @@ -623,7 +623,6 @@ static void renesas_usb3_stop_controller(struct renesas_usb3 *usb3) { usb3_disconnect(usb3); usb3_write(usb3, 0, USB3_P0_INT_ENA); - usb3_write(usb3, 0, USB3_PN_INT_ENA); usb3_write(usb3, 0, USB3_USB_OTG_INT_ENA); usb3_write(usb3, 0, USB3_USB_INT_ENA_1); usb3_write(usb3, 0, USB3_USB_INT_ENA_2); @@ -1682,6 +1681,7 @@ static int usb3_disable_pipe_n(struct renesas_usb3_ep *usb3_ep) spin_lock_irqsave(&usb3->lock, flags); if (!usb3_pn_change(usb3, usb3_ep->num)) { + usb3_write(usb3, 0, USB3_PN_INT_ENA); usb3_write(usb3, 0, USB3_PN_RAMMAP); usb3_clear_bit(usb3, PN_CON_EN, USB3_PN_CON); } -- cgit v1.2.3