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usb: musb: cppi41: Detect aborted transfers in cppi41_dma_callback()

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Update cppi41_dma_callback() to detect an aborted transfer.
This was not required before because cppi41_dma_callback() was only
invoked on transfer completion.
In order to make CPPI 4.1 driver more generic, cppi41_dma_callback()
will be invoked after a transfer abort in order to let the MUSB driver
perform some action such as acknowledge the interrupt that may be fired
during a teardown.

Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandre Bailon 2017-02-06 22:53:52 -06:00 committed by Greg Kroah-Hartman
parent 050dc900cf
commit ed232c0b4b
1 changed files with 9 additions and 4 deletions
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13
drivers/usb/musb/musb_cppi41.c
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@ -99,7 +99,8 @@ static bool musb_is_tx_fifo_empty(struct musb_hw_ep *hw_ep)
return true;
}
static void cppi41_dma_callback(void *private_data);
static void cppi41_dma_callback(void *private_data,
const struct dmaengine_result *result);
static void cppi41_trans_done(struct cppi41_dma_channel *cppi41_channel)
{
@ -154,7 +155,7 @@ static void cppi41_trans_done(struct cppi41_dma_channel *cppi41_channel)
if (WARN_ON(!dma_desc))
return;
dma_desc->callback = cppi41_dma_callback;
dma_desc->callback_result = cppi41_dma_callback;
dma_desc->callback_param = &cppi41_channel->channel;
cppi41_channel->cookie = dma_desc->tx_submit(dma_desc);
trace_musb_cppi41_cont(cppi41_channel);
@ -204,7 +205,8 @@ static enum hrtimer_restart cppi41_recheck_tx_req(struct hrtimer *timer)
return ret;
}
static void cppi41_dma_callback(void *private_data)
static void cppi41_dma_callback(void *private_data,
const struct dmaengine_result *result)
{
struct dma_channel *channel = private_data;
struct cppi41_dma_channel *cppi41_channel = channel->private_data;
@ -221,6 +223,9 @@ static void cppi41_dma_callback(void *private_data)
if (controller->controller.dma_callback)
controller->controller.dma_callback(&controller->controller);
if (result->result == DMA_TRANS_ABORTED)
return;
spin_lock_irqsave(&musb->lock, flags);
dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie,
@ -403,7 +408,7 @@ static bool cppi41_configure_channel(struct dma_channel *channel,
if (!dma_desc)
return false;
dma_desc->callback = cppi41_dma_callback;
dma_desc->callback_result = cppi41_dma_callback;
dma_desc->callback_param = channel;
cppi41_channel->cookie = dma_desc->tx_submit(dma_desc);
cppi41_channel->channel.rx_packet_done = false;