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[ARM] tegra: hsuart: use a workqueue in the tx dma callback

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Signed-off-by: Iliyan Malchev <malchev@google.com>
This commit is contained in:
Iliyan Malchev
2010-08-20 10:22:10 -07:00
parent 8418a2dfad
commit 281032d649
1 changed files with 19 additions and 6 deletions
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25
drivers/serial/tegra_hsuart.c
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@@ -40,6 +40,7 @@
#include <linux/serial_8250.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <mach/dma.h>
#include <mach/clk.h>
@@ -103,11 +104,12 @@ struct tegra_uart_port {
dma_addr_t xmit_dma_addr;
/* Rm DMA handles */
/* TX DMA */
struct tegra_dma_req tx_dma_req;
struct tegra_dma_channel *tx_dma;
struct work_struct tx_work;
/* DMA requests */
/* RX DMA */
struct tegra_dma_req rx_dma_req;
struct tegra_dma_channel *rx_dma;
@@ -409,9 +411,11 @@ static void do_handle_tx_pio(struct tegra_uart_port *t)
return;
}
static void tegra_tx_dma_complete_callback(struct tegra_dma_req *req)
static void tegra_tx_dma_complete_work(struct work_struct *work)
{
struct tegra_uart_port *t = req->dev;
struct tegra_uart_port *t =
container_of(work, struct tegra_uart_port, tx_work);
struct tegra_dma_req *req = &t->tx_dma_req;
struct circ_buf *xmit = &t->uport.state->xmit;
int count = req->bytes_transferred;
unsigned long flags;
@@ -442,6 +446,12 @@ static void tegra_tx_dma_complete_callback(struct tegra_dma_req *req)
spin_unlock_irqrestore(&t->uport.lock, flags);
}
static void tegra_tx_dma_complete_callback(struct tegra_dma_req *req)
{
struct tegra_uart_port *t = req->dev;
schedule_work(&t->tx_work);
}
static irqreturn_t tegra_uart_isr(int irq, void *data)
{
struct tegra_uart_port *t = data;
@@ -937,8 +947,10 @@ static void tegra_stop_tx(struct uart_port *u)
t = container_of(u, struct tegra_uart_port, uport);
if (t->use_tx_dma)
if (t->use_tx_dma) {
tegra_dma_dequeue_req(t->tx_dma, &t->tx_dma_req);
flush_work(&t->tx_work);
}
t->tx_in_progress = 0;
return;
}
@@ -1082,7 +1094,7 @@ static void tegra_flush_buffer(struct uart_port *u)
{
struct tegra_uart_port *t;
dev_vdbg(u->dev, "tegra_flush_buffer called");
dev_vdbg(u->dev, "%s called", __func__);
t = container_of(u, struct tegra_uart_port, uport);
@@ -1245,6 +1257,7 @@ static int tegra_uart_probe(struct platform_device *pdev)
pr_info("Registered UART port %s%d\n",
tegra_uart_driver.dev_name, u->line);
INIT_WORK(&t->tx_work, tegra_tx_dma_complete_work);
return ret;
fail:
kfree(t);