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serial: sh-sci: Improve DMA error messages 

Make the life of the driver developer/debugger easier:
  - Add __func__ prefix to identical messages,
  - Add DMA directions to messages,
  - Add TX failure messages,
  - Always use "cookie %d" for DMA cookies,
  - "#%d" is reserved for the DMA cookie/descriptor index.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2015-08-21 20:02:37 +02:00 committed by Greg Kroah-Hartman
parent 908030727b
commit beb9487b0c
1 changed files with 16 additions and 11 deletions
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27
drivers/tty/serial/sh-sci.c
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@ -1319,7 +1319,8 @@ static int sci_dma_rx_push(struct sci_port *s, size_t count)
} else if (s->active_rx == s->cookie_rx[1]) {
active = 1;
} else {
dev_err(port->dev, "cookie %d not found!\n", s->active_rx);
dev_err(port->dev, "%s: Rx cookie %d not found!\n", __func__,
s->active_rx);
return 0;
}
@ -1345,8 +1346,8 @@ static void sci_dma_rx_complete(void *arg)
unsigned long flags;
int count;
dev_dbg(port->dev, "%s(%d) active #%d\n",
__func__, port->line, s->active_rx);
dev_dbg(port->dev, "%s(%d) active cookie %d\n", __func__, port->line,
s->active_rx);
spin_lock_irqsave(&port->lock, flags);
@ -1418,12 +1419,12 @@ static void sci_submit_rx(struct sci_port *s)
s->cookie_rx[i] = -EINVAL;
}
dev_warn(s->port.dev,
"failed to re-start DMA, using PIO\n");
"Failed to re-start Rx DMA, using PIO\n");
sci_rx_dma_release(s, true);
return;
}
dev_dbg(s->port.dev, "%s(): cookie %d to #%d\n",
__func__, s->cookie_rx[i], i);
dev_dbg(s->port.dev, "%s(): cookie %d to #%d\n", __func__,
s->cookie_rx[i], i);
}
s->active_rx = s->cookie_rx[0];
@ -1443,7 +1444,8 @@ static void work_fn_rx(struct work_struct *work)
} else if (s->active_rx == s->cookie_rx[1]) {
new = 1;
} else {
dev_err(port->dev, "cookie %d not found!\n", s->active_rx);
dev_err(port->dev, "%s: Rx cookie %d not found!\n", __func__,
s->active_rx);
return;
}
desc = s->desc_rx[new];
@ -1482,7 +1484,7 @@ static void work_fn_rx(struct work_struct *work)
s->active_rx = s->cookie_rx[!new];
dev_dbg(port->dev, "%s: cookie %d #%d, new active #%d\n",
dev_dbg(port->dev, "%s: cookie %d #%d, new active cookie %d\n",
__func__, s->cookie_rx[new], new, s->active_rx);
}
@ -1516,6 +1518,7 @@ static void work_fn_tx(struct work_struct *work)
sg, s->sg_len_tx, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_warn(port->dev, "Failed preparing Tx DMA descriptor\n");
/* switch to PIO */
sci_tx_dma_release(s, true);
return;
@ -1704,13 +1707,15 @@ static void sci_request_dma(struct uart_port *port)
UART_XMIT_SIZE,
(uintptr_t)port->state->xmit.buf & ~PAGE_MASK);
nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE);
if (!nent)
if (!nent) {
dev_warn(port->dev, "Failed mapping Tx DMA descriptor\n");
sci_tx_dma_release(s, false);
else
} else {
dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n",
__func__,
sg_dma_len(&s->sg_tx), port->state->xmit.buf,
&sg_dma_address(&s->sg_tx));
}
s->sg_len_tx = nent;
@ -1737,7 +1742,7 @@ static void sci_request_dma(struct uart_port *port)
if (!buf[0]) {
dev_warn(port->dev,
"failed to allocate dma buffer, using PIO\n");
"Failed to allocate Rx dma buffer, using PIO\n");
sci_rx_dma_release(s, true);
return;
}