diff options
Diffstat (limited to 'meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0029-musb-support-disconnect-after-HNP-roleswitch.patch')
| -rw-r--r-- | meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0029-musb-support-disconnect-after-HNP-roleswitch.patch | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0029-musb-support-disconnect-after-HNP-roleswitch.patch b/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0029-musb-support-disconnect-after-HNP-roleswitch.patch new file mode 100644 index 0000000000..fc34fb983e --- /dev/null +++ b/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0029-musb-support-disconnect-after-HNP-roleswitch.patch @@ -0,0 +1,145 @@ +From 4288b7df4ae6629a4fb14aca2c489da01d4d19c3 Mon Sep 17 00:00:00 2001 +From: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +Date: Tue, 31 Mar 2009 12:35:09 -0700 +Subject: [PATCH] musb: support disconnect after HNP roleswitch + +Adjust HNP state machines in MUSB driver so that they handle the +case where the cable is disconnected. The A-side machine was +very wrong (unrecoverable); the B-Side was much less so. + + - A_PERIPHERAL ... as usual, the non-observability of the ID + pin through Mentor's registers makes trouble. We can't go + directly to A_WAIT_VFALL to end the session and start the + disconnect processing. We can however sense link suspending, + go to A_WAIT_BCON, and from there use OTG timeouts to finally + trigger that A_WAIT_VFALL transition. (Hoping that nobody + reconnects quickly to that port and notices the wrong state.) + + - B_HOST ... actually clear the Host Request (HR) bit as the + messages say, disconnect the peripheral from the root hub, + and don't detour through a suspend state. (In some cases + this would eventually have cleaned up.) + +Also adjust the A_SUSPEND transition to respect the A_AIDL_BDIS +timeout, so if HNP doesn't trigger quickly enough the A_WAIT_VFALL +transition happens as it should. + +Signed-off-by: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +--- + drivers/usb/musb/musb_core.c | 41 +++++++++++++++++++++++++++----------- + drivers/usb/musb/musb_gadget.c | 2 + + drivers/usb/musb/musb_virthub.c | 4 +++ + 3 files changed, 35 insertions(+), 12 deletions(-) + +diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c +index 9dc995a..5770ccb 100644 +--- a/drivers/usb/musb/musb_core.c ++++ b/drivers/usb/musb/musb_core.c +@@ -304,9 +304,11 @@ void musb_otg_timer_func(unsigned long data) + musb->xceiv->state = OTG_STATE_B_PERIPHERAL; + musb->is_active = 0; + break; ++ case OTG_STATE_A_SUSPEND: + case OTG_STATE_A_WAIT_BCON: +- DBG(1, "HNP: a_wait_bcon timeout; back to a_host\n"); +- musb_hnp_stop(musb); ++ DBG(1, "HNP: %s timeout\n", otg_state_string(musb)); ++ musb_set_vbus(musb, 0); ++ musb->xceiv->state = OTG_STATE_A_WAIT_VFALL; + break; + default: + DBG(1, "HNP: Unhandled mode %s\n", otg_state_string(musb)); +@@ -324,15 +326,12 @@ void musb_hnp_stop(struct musb *musb) + void __iomem *mbase = musb->mregs; + u8 reg; + ++ DBG(1, "HNP: stop from %s\n", otg_state_string(musb)); ++ + switch (musb->xceiv->state) { + case OTG_STATE_A_PERIPHERAL: +- case OTG_STATE_A_WAIT_VFALL: +- case OTG_STATE_A_WAIT_BCON: +- DBG(1, "HNP: Switching back to A-host\n"); + musb_g_disconnect(musb); +- musb->xceiv->state = OTG_STATE_A_IDLE; +- MUSB_HST_MODE(musb); +- musb->is_active = 0; ++ DBG(1, "HNP: back to %s\n", otg_state_string(musb)); + break; + case OTG_STATE_B_HOST: + DBG(1, "HNP: Disabling HR\n"); +@@ -775,7 +774,16 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb, + #endif /* HOST */ + #ifdef CONFIG_USB_MUSB_OTG + case OTG_STATE_B_HOST: +- musb_hnp_stop(musb); ++ /* REVISIT this behaves for "real disconnect" ++ * cases; make sure the other transitions from ++ * from B_HOST act right too. The B_HOST code ++ * in hnp_stop() is currently not used... ++ */ ++ musb_root_disconnect(musb); ++ musb_to_hcd(musb)->self.is_b_host = 0; ++ musb->xceiv->state = OTG_STATE_B_PERIPHERAL; ++ MUSB_DEV_MODE(musb); ++ musb_g_disconnect(musb); + break; + case OTG_STATE_A_PERIPHERAL: + musb_hnp_stop(musb); +@@ -807,10 +815,19 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb, + switch (musb->xceiv->state) { + #ifdef CONFIG_USB_MUSB_OTG + case OTG_STATE_A_PERIPHERAL: +- /* +- * We cannot stop HNP here, devctl BDEVICE might be +- * still set. ++ /* We also come here if the cable is removed, since ++ * this silicon doesn't report ID-no-longer-grounded. ++ * ++ * We depend on T(a_wait_bcon) to shut us down, and ++ * hope users don't do anything dicey during this ++ * undesired detour through A_WAIT_BCON. + */ ++ musb_hnp_stop(musb); ++ usb_hcd_resume_root_hub(musb_to_hcd(musb)); ++ musb_root_disconnect(musb); ++ musb_platform_try_idle(musb, jiffies ++ + msecs_to_jiffies(musb->a_wait_bcon ++ ? : OTG_TIME_A_WAIT_BCON)); + break; + #endif + case OTG_STATE_B_PERIPHERAL: +diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c +index 7dd3d59..8b3c4e2 100644 +--- a/drivers/usb/musb/musb_gadget.c ++++ b/drivers/usb/musb/musb_gadget.c +@@ -1962,9 +1962,11 @@ void musb_g_disconnect(struct musb *musb) + DBG(2, "Unhandled disconnect %s, setting a_idle\n", + otg_state_string(musb)); + musb->xceiv->state = OTG_STATE_A_IDLE; ++ MUSB_HST_MODE(musb); + break; + case OTG_STATE_A_PERIPHERAL: + musb->xceiv->state = OTG_STATE_A_WAIT_BCON; ++ MUSB_HST_MODE(musb); + break; + case OTG_STATE_B_WAIT_ACON: + case OTG_STATE_B_HOST: +diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c +index 14f7cf3..e8ef925 100644 +--- a/drivers/usb/musb/musb_virthub.c ++++ b/drivers/usb/musb/musb_virthub.c +@@ -83,6 +83,10 @@ static void musb_port_suspend(struct musb *musb, bool do_suspend) + musb->xceiv->state = OTG_STATE_A_SUSPEND; + musb->is_active = is_otg_enabled(musb) + && musb->xceiv->host->b_hnp_enable; ++ if (musb->is_active) ++ mod_timer(&musb->otg_timer, jiffies ++ + msecs_to_jiffies( ++ OTG_TIME_A_AIDL_BDIS)); + musb_platform_try_idle(musb, 0); + break; + #ifdef CONFIG_USB_MUSB_OTG +-- +1.6.0.4 + |