lkml.org 
[lkml]   [2014]   [May]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 3/5] usb: musb: core: Convert the musb_platform_reset to have a return value.
Date
Currently musb_platform_reset() is only used by dsps.
In case of BABBLE interrupt for other platforms the musb_platform_reset()
is a NOP. In such situations no need to re-initialize the endpoints.
Also in the latest silicon revision of AM335x, we do have a babble recovery
mechanism without resetting the IP block. In preperation to add that support
its better to have a rest_done return for musb_platform_reset().

Signed-off-by: George Cherian <george.cherian@ti.com>
---
drivers/usb/musb/musb_core.c | 38 +++++++++++++++++++++-----------------
drivers/usb/musb/musb_core.h | 10 ++++++----
drivers/usb/musb/musb_dsps.c | 3 ++-
3 files changed, 29 insertions(+), 22 deletions(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index dcadc62..983a591 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1755,28 +1755,32 @@ static void musb_irq_work(struct work_struct *data)
static void musb_recover_work(struct work_struct *data)
{
struct musb *musb = container_of(data, struct musb, recover_work.work);
- int status;
+ int status, reset_done;

- musb_platform_reset(musb);
+ reset_done = musb_platform_reset(musb);
+ if (reset_done < 0)
+ return;

- usb_phy_vbus_off(musb->xceiv);
- usleep_range(100, 200);
+ if (reset_done) {
+ usb_phy_vbus_off(musb->xceiv);
+ usleep_range(100, 200);

- usb_phy_vbus_on(musb->xceiv);
- usleep_range(100, 200);
+ usb_phy_vbus_on(musb->xceiv);
+ usleep_range(100, 200);

- /*
- * When a babble condition occurs, the musb controller removes the
- * session bit and the endpoint config is lost.
- */
- if (musb->dyn_fifo)
- status = ep_config_from_table(musb);
- else
- status = ep_config_from_hw(musb);
+ /*
+ * When a babble condition occurs, the musb controller removes the
+ * session bit and the endpoint config is lost.
+ */
+ if (musb->dyn_fifo)
+ status = ep_config_from_table(musb);
+ else
+ status = ep_config_from_hw(musb);

- /* start the session again */
- if (status == 0)
- musb_start(musb);
+ /* start the session again */
+ if (status == 0)
+ musb_start(musb);
+ }
}

/* --------------------------------------------------------------------------
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index 423cd00..3ccb428 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -192,7 +192,7 @@ struct musb_platform_ops {

int (*set_mode)(struct musb *musb, u8 mode);
void (*try_idle)(struct musb *musb, unsigned long timeout);
- void (*reset)(struct musb *musb);
+ int (*reset)(struct musb *musb);

int (*vbus_status)(struct musb *musb);
void (*set_vbus)(struct musb *musb, int on);
@@ -554,10 +554,12 @@ static inline void musb_platform_try_idle(struct musb *musb,
musb->ops->try_idle(musb, timeout);
}

-static inline void musb_platform_reset(struct musb *musb)
+static inline int musb_platform_reset(struct musb *musb)
{
- if (musb->ops->reset)
- musb->ops->reset(musb);
+ if (!musb->ops->reset)
+ return -EINVAL;
+
+ return musb->ops->reset(musb);
}

static inline int musb_platform_get_vbus_status(struct musb *musb)
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 74c4193..8438200 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -536,7 +536,7 @@ static int dsps_musb_set_mode(struct musb *musb, u8 mode)
return 0;
}

-static void dsps_musb_reset(struct musb *musb)
+static int dsps_musb_reset(struct musb *musb)
{
struct device *dev = musb->controller;
struct dsps_glue *glue = dev_get_drvdata(dev->parent);
@@ -548,6 +548,7 @@ static void dsps_musb_reset(struct musb *musb)
usleep_range(100, 200);
usb_phy_init(musb->xceiv);

+ return 1;
}

static struct musb_platform_ops dsps_ops = {
--
1.8.3.1


\
 
 \ /
  Last update: 2014-05-09 07:41    [W:0.069 / U:0.440 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site