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usb: musb: musb_cppi41: factor most of cppi41_dma_callback() into cppi41_trans_done()

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This patch moves most of the logic in cppi41_dma_callback() into
cppi41_trans_done() where it can be called from another function.
Instead of computing "transferred" (the number of bytes transferred in
the last transaction) in cppi41_trans_done() the member
"cppi41_channel->prog_len" is now set to 0 if the transfer as a whole
can be considered as done. If it is != 0 then the next iteration is
assumed.
This is a preparation for a workaround.

Cc: stable@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Sebastian Andrzej Siewior 2013-11-12 16:37:46 +01:00 committed by Felipe Balbi
parent 37cfbc4288
commit d373a8534d
1 changed files with 36 additions and 23 deletions
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59
drivers/usb/musb/musb_cppi41.c
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@ -96,31 +96,15 @@ static void update_rx_toggle(struct cppi41_dma_channel *cppi41_channel)
cppi41_channel->usb_toggle = toggle;
}
static void cppi41_dma_callback(void *private_data)
static void cppi41_dma_callback(void *private_data);
static void cppi41_trans_done(struct dma_channel *channel)
{
struct dma_channel *channel = private_data;
struct cppi41_dma_channel *cppi41_channel = channel->private_data;
struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep;
struct musb *musb = hw_ep->musb;
unsigned long flags;
struct dma_tx_state txstate;
u32 transferred;
spin_lock_irqsave(&musb->lock, flags);
dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie,
&txstate);
transferred = cppi41_channel->prog_len - txstate.residue;
cppi41_channel->transferred += transferred;
dev_dbg(musb->controller, "DMA transfer done on hw_ep=%d bytes=%d/%d\n",
hw_ep->epnum, cppi41_channel->transferred,
cppi41_channel->total_len);
update_rx_toggle(cppi41_channel);
if (cppi41_channel->transferred == cppi41_channel->total_len ||
transferred < cppi41_channel->packet_sz) {
if (!cppi41_channel->prog_len) {
/* done, complete */
cppi41_channel->channel.actual_len =
@ -150,10 +134,8 @@ static void cppi41_dma_callback(void *private_data)
remain_bytes,
direction,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (WARN_ON(!dma_desc)) {
spin_unlock_irqrestore(&musb->lock, flags);
if (WARN_ON(!dma_desc))
return;
}
dma_desc->callback = cppi41_dma_callback;
dma_desc->callback_param = channel;
@ -166,6 +148,37 @@ static void cppi41_dma_callback(void *private_data)
musb_writew(epio, MUSB_RXCSR, csr);
}
}
}
static void cppi41_dma_callback(void *private_data)
{
struct dma_channel *channel = private_data;
struct cppi41_dma_channel *cppi41_channel = channel->private_data;
struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep;
struct musb *musb = hw_ep->musb;
unsigned long flags;
struct dma_tx_state txstate;
u32 transferred;
spin_lock_irqsave(&musb->lock, flags);
dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie,
&txstate);
transferred = cppi41_channel->prog_len - txstate.residue;
cppi41_channel->transferred += transferred;
dev_dbg(musb->controller, "DMA transfer done on hw_ep=%d bytes=%d/%d\n",
hw_ep->epnum, cppi41_channel->transferred,
cppi41_channel->total_len);
update_rx_toggle(cppi41_channel);
if (cppi41_channel->transferred == cppi41_channel->total_len ||
transferred < cppi41_channel->packet_sz)
cppi41_channel->prog_len = 0;
cppi41_trans_done(channel);
spin_unlock_irqrestore(&musb->lock, flags);
}