diff options
Diffstat (limited to 'meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0027-musb-otg-timer-cleanup.patch')
| -rw-r--r-- | meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0027-musb-otg-timer-cleanup.patch | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0027-musb-otg-timer-cleanup.patch b/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0027-musb-otg-timer-cleanup.patch new file mode 100644 index 0000000000..f41b766cfe --- /dev/null +++ b/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0027-musb-otg-timer-cleanup.patch @@ -0,0 +1,198 @@ +From b4b8c1e7604784b9877f07400ff2a718118ef05c Mon Sep 17 00:00:00 2001 +From: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +Date: Tue, 31 Mar 2009 12:32:12 -0700 +Subject: [PATCH] musb: otg timer cleanup + +Minor cleanup of OTG timer handling: + * unify decls for OTG time constants, in the core header + * set up and use that timer in a more normal way + * move to the driver struct, so it's usable outside core + +And tighten use and setup of T(a_wait_bcon) so that if it's used, +it's always valid. (If that timer expires, the A-device will +stop powering VBUS. For non-OTG systems, that will be a surprise.) +No behavioral changes, other than more consistency when applying +that core HNP timeout. + +Signed-off-by: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +--- + drivers/usb/musb/musb_core.c | 41 ++++++++++++++++++++++------------------- + drivers/usb/musb/musb_core.h | 14 +++++++++++--- + drivers/usb/musb/omap2430.c | 2 -- + 3 files changed, 33 insertions(+), 24 deletions(-) + +diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c +index ac150af..05c5dd3 100644 +--- a/drivers/usb/musb/musb_core.c ++++ b/drivers/usb/musb/musb_core.c +@@ -112,6 +112,7 @@ + #include "davinci.h" + #endif + ++#define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON) + + + unsigned musb_debug; +@@ -288,12 +289,6 @@ const char *otg_state_string(struct musb *musb) + #ifdef CONFIG_USB_MUSB_OTG + + /* +- * See also USB_OTG_1-3.pdf 6.6.5 Timers +- * REVISIT: Are the other timers done in the hardware? +- */ +-#define TB_ASE0_BRST 100 /* Min 3.125 ms */ +- +-/* + * Handles OTG hnp timeouts, such as b_ase0_brst + */ + void musb_otg_timer_func(unsigned long data) +@@ -320,10 +315,8 @@ void musb_otg_timer_func(unsigned long data) + spin_unlock_irqrestore(&musb->lock, flags); + } + +-static DEFINE_TIMER(musb_otg_timer, musb_otg_timer_func, 0, 0); +- + /* +- * Stops the B-device HNP state. Caller must take care of locking. ++ * Stops the HNP transition. Caller must take care of locking. + */ + void musb_hnp_stop(struct musb *musb) + { +@@ -661,11 +654,12 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb, + musb_g_reset(musb); + /* FALLTHROUGH */ + case OTG_STATE_A_WAIT_BCON: /* OPT TD.4.7-900ms */ +- DBG(1, "HNP: Setting timer as %s\n", +- otg_state_string(musb)); +- musb_otg_timer.data = (unsigned long)musb; +- mod_timer(&musb_otg_timer, jiffies +- + msecs_to_jiffies(100)); ++ /* never use invalid T(a_wait_bcon) */ ++ DBG(1, "HNP: in %s, %d msec timeout\n", ++ otg_state_string(musb), ++ TA_WAIT_BCON(musb)); ++ mod_timer(&musb->otg_timer, jiffies ++ + msecs_to_jiffies(TA_WAIT_BCON(musb))); + break; + case OTG_STATE_A_PERIPHERAL: + musb_hnp_stop(musb); +@@ -822,9 +816,9 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb, + #ifdef CONFIG_USB_MUSB_OTG + musb->xceiv->state = OTG_STATE_B_WAIT_ACON; + DBG(1, "HNP: Setting timer for b_ase0_brst\n"); +- musb_otg_timer.data = (unsigned long)musb; +- mod_timer(&musb_otg_timer, jiffies +- + msecs_to_jiffies(TB_ASE0_BRST)); ++ mod_timer(&musb->otg_timer, jiffies ++ + msecs_to_jiffies( ++ OTG_TIME_B_ASE0_BRST)); + #endif + } + break; +@@ -1680,7 +1674,8 @@ musb_vbus_store(struct device *dev, struct device_attribute *attr, + } + + spin_lock_irqsave(&musb->lock, flags); +- musb->a_wait_bcon = val; ++ /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */ ++ musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ; + if (musb->xceiv->state == OTG_STATE_A_WAIT_BCON) + musb->is_active = 0; + musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val)); +@@ -1699,10 +1694,13 @@ musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf) + + spin_lock_irqsave(&musb->lock, flags); + val = musb->a_wait_bcon; ++ /* FIXME get_vbus_status() is normally #defined as false... ++ * and is effectively TUSB-specific. ++ */ + vbus = musb_platform_get_vbus_status(musb); + spin_unlock_irqrestore(&musb->lock, flags); + +- return sprintf(buf, "Vbus %s, timeout %lu\n", ++ return sprintf(buf, "Vbus %s, timeout %lu msec\n", + vbus ? "on" : "off", val); + } + static DEVICE_ATTR(vbus, 0644, musb_vbus_show, musb_vbus_store); +@@ -1775,6 +1773,7 @@ allocate_instance(struct device *dev, + hcd->uses_new_polling = 1; + + musb->vbuserr_retry = VBUSERR_RETRY_COUNT; ++ musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON; + #else + musb = kzalloc(sizeof *musb, GFP_KERNEL); + if (!musb) +@@ -1969,6 +1968,10 @@ bad_config: + if (status < 0) + goto fail2; + ++#ifdef CONFIG_USB_OTG ++ setup_timer(&musb->otg_timer, musb_otg_timer_func, (unsigned long) musb); ++#endif ++ + /* Init IRQ workqueue before request_irq */ + INIT_WORK(&musb->irq_work, musb_irq_work); + +diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h +index c3ee348..cf3ccb0 100644 +--- a/drivers/usb/musb/musb_core.h ++++ b/drivers/usb/musb/musb_core.h +@@ -40,6 +40,7 @@ + #include <linux/interrupt.h> + #include <linux/smp_lock.h> + #include <linux/errno.h> ++#include <linux/timer.h> + #include <linux/clk.h> + #include <linux/device.h> + #include <linux/usb/ch9.h> +@@ -180,10 +181,15 @@ enum musb_g_ep0_state { + MUSB_EP0_STAGE_ACKWAIT, /* after zlp, before statusin */ + } __attribute__ ((packed)); + +-/* OTG protocol constants */ ++/* ++ * OTG protocol constants. See USB OTG 1.3 spec, ++ * sections 5.5 "Device Timings" and 6.6.5 "Timers". ++ */ + #define OTG_TIME_A_WAIT_VRISE 100 /* msec (max) */ +-#define OTG_TIME_A_WAIT_BCON 0 /* 0=infinite; min 1000 msec */ +-#define OTG_TIME_A_IDLE_BDIS 200 /* msec (min) */ ++#define OTG_TIME_A_WAIT_BCON 1100 /* min 1 second */ ++#define OTG_TIME_A_AIDL_BDIS 200 /* min 200 msec */ ++#define OTG_TIME_B_ASE0_BRST 100 /* min 3.125 ms */ ++ + + /*************************** REGISTER ACCESS ********************************/ + +@@ -332,6 +338,8 @@ struct musb { + struct list_head control; /* of musb_qh */ + struct list_head in_bulk; /* of musb_qh */ + struct list_head out_bulk; /* of musb_qh */ ++ ++ struct timer_list otg_timer; + #endif + + /* called with IRQs blocked; ON/nonzero implies starting a session, +diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c +index 5f67b03..3fbc807 100644 +--- a/drivers/usb/musb/omap2430.c ++++ b/drivers/usb/musb/omap2430.c +@@ -45,7 +45,6 @@ + #define get_cpu_rev() 2 + #endif + +-#define MUSB_TIMEOUT_A_WAIT_BCON 1100 + + static struct timer_list musb_idle_timer; + +@@ -246,7 +245,6 @@ int __init musb_platform_init(struct musb *musb) + + if (is_host_enabled(musb)) + musb->board_set_vbus = omap_set_vbus; +- musb->a_wait_bcon = MUSB_TIMEOUT_A_WAIT_BCON; + + setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb); + +-- +1.6.0.4 + |