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authorGeorge Cherian <george.cherian@ti.com>2014-01-27 15:07:26 +0530
committerFelipe Balbi <balbi@ti.com>2014-02-18 09:25:56 -0600
commit1af54b7a40ca9bbd549e626be01870caa3f0299d (patch)
tree9191beaa4ca1ad13fa05794d9dbcde5a69739b4e /drivers/usb/musb/musb_cppi41.c
parentf82503f549c70c15e283511270e6713a912fef37 (diff)
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usb: musb: musb_cppi41: Handle ISOCH differently and not use the hrtimer.
In case of ISOCH transfers the hrtimer workaround for the hardware issue is not very reliable. Instead of checking musb_is_tx_fifo_empty() in hrtimer routine, schedule a completion work and check the same in completion work. Signed-off-by: George Cherian <george.cherian@ti.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/musb/musb_cppi41.c')
-rw-r--r--drivers/usb/musb/musb_cppi41.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
index 39ee516c8cbf..5b0f2a58f8ce 100644
--- a/drivers/usb/musb/musb_cppi41.c
+++ b/drivers/usb/musb/musb_cppi41.c
@@ -39,6 +39,7 @@ struct cppi41_dma_channel {
u32 transferred;
u32 packet_sz;
struct list_head tx_check;
+ struct work_struct dma_completion;
};
#define MUSB_DMA_NUM_CHANNELS 15
@@ -112,6 +113,18 @@ static bool musb_is_tx_fifo_empty(struct musb_hw_ep *hw_ep)
return true;
}
+static bool is_isoc(struct musb_hw_ep *hw_ep, bool in)
+{
+ if (in && hw_ep->in_qh) {
+ if (hw_ep->in_qh->type == USB_ENDPOINT_XFER_ISOC)
+ return true;
+ } else if (hw_ep->out_qh) {
+ if (hw_ep->out_qh->type == USB_ENDPOINT_XFER_ISOC)
+ return true;
+ }
+ return false;
+}
+
static void cppi41_dma_callback(void *private_data);
static void cppi41_trans_done(struct cppi41_dma_channel *cppi41_channel)
@@ -165,6 +178,32 @@ static void cppi41_trans_done(struct cppi41_dma_channel *cppi41_channel)
}
}
+static void cppi_trans_done_work(struct work_struct *work)
+{
+ unsigned long flags;
+ struct cppi41_dma_channel *cppi41_channel =
+ container_of(work, struct cppi41_dma_channel, dma_completion);
+ struct cppi41_dma_controller *controller = cppi41_channel->controller;
+ struct musb *musb = controller->musb;
+ struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep;
+ bool empty;
+
+ if (!cppi41_channel->is_tx && is_isoc(hw_ep, 1)) {
+ spin_lock_irqsave(&musb->lock, flags);
+ cppi41_trans_done(cppi41_channel);
+ spin_unlock_irqrestore(&musb->lock, flags);
+ } else {
+ empty = musb_is_tx_fifo_empty(hw_ep);
+ if (empty) {
+ spin_lock_irqsave(&musb->lock, flags);
+ cppi41_trans_done(cppi41_channel);
+ spin_unlock_irqrestore(&musb->lock, flags);
+ } else {
+ schedule_work(&cppi41_channel->dma_completion);
+ }
+ }
+}
+
static enum hrtimer_restart cppi41_recheck_tx_req(struct hrtimer *timer)
{
struct cppi41_dma_controller *controller;
@@ -228,6 +267,14 @@ static void cppi41_dma_callback(void *private_data)
transferred < cppi41_channel->packet_sz)
cppi41_channel->prog_len = 0;
+ if (!cppi41_channel->is_tx) {
+ if (is_isoc(hw_ep, 1))
+ schedule_work(&cppi41_channel->dma_completion);
+ else
+ cppi41_trans_done(cppi41_channel);
+ goto out;
+ }
+
empty = musb_is_tx_fifo_empty(hw_ep);
if (empty) {
cppi41_trans_done(cppi41_channel);
@@ -264,6 +311,10 @@ static void cppi41_dma_callback(void *private_data)
goto out;
}
}
+ if (is_isoc(hw_ep, 0)) {
+ schedule_work(&cppi41_channel->dma_completion);
+ goto out;
+ }
list_add_tail(&cppi41_channel->tx_check,
&controller->early_tx_list);
if (!hrtimer_active(&controller->early_tx)) {
@@ -620,6 +671,8 @@ static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller)
cppi41_channel->port_num = port;
cppi41_channel->is_tx = is_tx;
INIT_LIST_HEAD(&cppi41_channel->tx_check);
+ INIT_WORK(&cppi41_channel->dma_completion,
+ cppi_trans_done_work);
musb_dma = &cppi41_channel->channel;
musb_dma->private_data = cppi41_channel;