Hi,
While adding upstream support to a new platform (Mobileye EyeQ5[1]) that
uses the AMBA PL011 driver, I took some time to look at the PL011
driver and ended up with a few patches that cleanup parts of it. The
line-diff is big mostly because of the checkpatch-fixing commits.
The driver hadn't received any love for quite some time. See commit
messages for more information.
v6 drops [PATCH v5 1/9] as it has been applied by Greg KH. It also fixes
[PATCH v5 2/9] that broke on ARCH=arm ep93xx_defconfig because the header file
is included from assembly.
[1]: https://lore.kernel.org/all/[email protected]/T/
Have a nice day,
Théo Lebrun
Signed-off-by: Théo Lebrun <[email protected]>
---
Changes in v6:
- Address kernel test robot failure; amba/serial.h is included from assembly.
- Drop [PATCH v5 1/9] as it has been applied by Greg KH.
- Link to v5: https://lore.kernel.org/r/[email protected]
Changes in v5:
- Rebase upon v6.7-rc1.
- Add #include <linux/bitfield.h> in include/linux/amba/serial.h.
- Split [PATCH v4 3/6] into 5 manageable commits.
- Link to v4: https://lore.kernel.org/r/[email protected]
Changes in v4:
- Fix reverse if logic bug in [PATCH V3 6/6].
- Link to v3: https://lore.kernel.org/r/[email protected]
Changes in v3:
- Replace magic constants in linux/amba/serial.h by FIELD_PREP_CONST calls
- Refactor QDF2400 SoC erratum 44 handling out of probe in a new patch
- A nit in "unindent pl011_console_get_options function body"
- Link to v2: https://lore.kernel.org/r/[email protected]
Changes in v2:
- [PATCH 2]: add #include <linux/bits.h> in include/linux/amba/serial.h
as we use the BIT() macro.
- Move one whitespace cleanup from [PATCH 4/6] to [PATCH v2 3/5] where
it belongs.
- Drop [PATCH 6/6]: console will never have a word length of 5 or 6.
- Link to v1: https://lore.kernel.org/r/[email protected]
---
Théo Lebrun (8):
tty: serial: amba: Use linux/{bits,bitfield}.h macros
tty: serial: amba-pl011: fix whitespace formatting
tty: serial: amba-pl011: replace TIOCMBIT macros by static functions
tty: serial: amba-pl011: avoid quoted string split across lines
tty: serial: amba-pl011: fix formatting of conditions
tty: serial: amba-pl011: fix miscellaneous checkpatch warnings
tty: serial: amba-pl011: unindent pl011_console_get_options function body
tty: serial: amba-pl011: factor QDF2400 SoC erratum 44 out of probe
drivers/tty/serial/amba-pl011.c | 261 +++++++++++++++++++++-------------------
include/linux/amba/serial.h | 251 +++++++++++++++++++-------------------
2 files changed, 264 insertions(+), 248 deletions(-)
---
base-commit: bfc1fa3f077a32febb518c1df54e1ee922eee05d
change-id: 20231023-mbly-uart-afcacbb98f8b
Best regards,
--
Théo Lebrun <[email protected]>
Follow recommandations from:
$ ./scripts/checkpatch.pl --strict --file \
drivers/tty/serial/amba-pl011.c
We fix 5 warnings and 48 checks, all related to whitespace.
Culprits are:
CHECK: Alignment should match open parenthesis
CHECK: Blank lines aren't necessary after an open brace '{'
CHECK: Lines should not end with a '('
CHECK: Please don't use multiple blank lines
CHECK: Please use a blank line after function/struct/union/enum
declarations
CHECK: spaces preferred around that '/' (ctx:VxV)
CHECK: spaces preferred around that '|' (ctx:VxV)
WARNING: Missing a blank line after declarations
WARNING: please, no spaces at the start of a line
Signed-off-by: Théo Lebrun <[email protected]>
---
drivers/tty/serial/amba-pl011.c | 97 +++++++++++++++++++----------------------
1 file changed, 45 insertions(+), 52 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index b7635363373e..7bd0b68ef92f 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -50,7 +50,7 @@
#define AMBA_ISR_PASS_LIMIT 256
-#define UART_DR_ERROR (UART011_DR_OE|UART011_DR_BE|UART011_DR_PE|UART011_DR_FE)
+#define UART_DR_ERROR (UART011_DR_OE | UART011_DR_BE | UART011_DR_PE | UART011_DR_FE)
#define UART_DUMMY_DR_RX (1 << 16)
enum {
@@ -125,7 +125,7 @@ static unsigned int get_fifosize_arm(struct amba_device *dev)
static struct vendor_data vendor_arm = {
.reg_offset = pl011_std_offsets,
- .ifls = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
+ .ifls = UART011_IFLS_RX4_8 | UART011_IFLS_TX4_8,
.fr_busy = UART01x_FR_BUSY,
.fr_dsr = UART01x_FR_DSR,
.fr_cts = UART01x_FR_CTS,
@@ -203,7 +203,7 @@ static unsigned int get_fifosize_st(struct amba_device *dev)
static struct vendor_data vendor_st = {
.reg_offset = pl011_st_offsets,
- .ifls = UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
+ .ifls = UART011_IFLS_RX_HALF | UART011_IFLS_TX_HALF,
.fr_busy = UART01x_FR_BUSY,
.fr_dsr = UART01x_FR_DSR,
.fr_cts = UART01x_FR_CTS,
@@ -277,13 +277,13 @@ struct uart_amba_port {
static unsigned int pl011_tx_empty(struct uart_port *port);
static unsigned int pl011_reg_to_offset(const struct uart_amba_port *uap,
- unsigned int reg)
+ unsigned int reg)
{
return uap->reg_offset[reg];
}
static unsigned int pl011_read(const struct uart_amba_port *uap,
- unsigned int reg)
+ unsigned int reg)
{
void __iomem *addr = uap->port.membase + pl011_reg_to_offset(uap, reg);
@@ -292,7 +292,7 @@ static unsigned int pl011_read(const struct uart_amba_port *uap,
}
static void pl011_write(unsigned int val, const struct uart_amba_port *uap,
- unsigned int reg)
+ unsigned int reg)
{
void __iomem *addr = uap->port.membase + pl011_reg_to_offset(uap, reg);
@@ -358,7 +358,6 @@ static int pl011_fifo_to_tty(struct uart_amba_port *uap)
return fifotaken;
}
-
/*
* All the DMA operation mode stuff goes inside this ifdef.
* This assumes that you have a generic DMA device interface,
@@ -369,7 +368,7 @@ static int pl011_fifo_to_tty(struct uart_amba_port *uap)
#define PL011_DMA_BUFFER_SIZE PAGE_SIZE
static int pl011_dmabuf_init(struct dma_chan *chan, struct pl011_dmabuf *db,
- enum dma_data_direction dir)
+ enum dma_data_direction dir)
{
db->buf = dma_alloc_coherent(chan->device->dev, PL011_DMA_BUFFER_SIZE,
&db->dma, GFP_KERNEL);
@@ -381,7 +380,7 @@ static int pl011_dmabuf_init(struct dma_chan *chan, struct pl011_dmabuf *db,
}
static void pl011_dmabuf_free(struct dma_chan *chan, struct pl011_dmabuf *db,
- enum dma_data_direction dir)
+ enum dma_data_direction dir)
{
if (db->buf) {
dma_free_coherent(chan->device->dev,
@@ -424,7 +423,7 @@ static void pl011_dma_probe(struct uart_amba_port *uap)
dma_cap_set(DMA_SLAVE, mask);
chan = dma_request_channel(mask, plat->dma_filter,
- plat->dma_tx_param);
+ plat->dma_tx_param);
if (!chan) {
dev_err(uap->port.dev, "no TX DMA channel!\n");
return;
@@ -470,7 +469,7 @@ static void pl011_dma_probe(struct uart_amba_port *uap)
DMA_RESIDUE_GRANULARITY_DESCRIPTOR) {
dma_release_channel(chan);
dev_info(uap->port.dev,
- "RX DMA disabled - no residue processing\n");
+ "RX DMA disabled - no residue processing\n");
return;
}
}
@@ -499,18 +498,16 @@ static void pl011_dma_probe(struct uart_amba_port *uap)
else
uap->dmarx.poll_timeout = 3000;
} else if (!plat && dev->of_node) {
- uap->dmarx.auto_poll_rate = of_property_read_bool(
- dev->of_node, "auto-poll");
+ uap->dmarx.auto_poll_rate =
+ of_property_read_bool(dev->of_node, "auto-poll");
if (uap->dmarx.auto_poll_rate) {
u32 x;
- if (0 == of_property_read_u32(dev->of_node,
- "poll-rate-ms", &x))
+ if (0 == of_property_read_u32(dev->of_node, "poll-rate-ms", &x))
uap->dmarx.poll_rate = x;
else
uap->dmarx.poll_rate = 100;
- if (0 == of_property_read_u32(dev->of_node,
- "poll-timeout-ms", &x))
+ if (0 == of_property_read_u32(dev->of_node, "poll-timeout-ms", &x))
uap->dmarx.poll_timeout = x;
else
uap->dmarx.poll_timeout = 3000;
@@ -547,7 +544,7 @@ static void pl011_dma_tx_callback(void *data)
uart_port_lock_irqsave(&uap->port, &flags);
if (uap->dmatx.queued)
dma_unmap_single(dmatx->chan->device->dev, dmatx->dma,
- dmatx->len, DMA_TO_DEVICE);
+ dmatx->len, DMA_TO_DEVICE);
dmacr = uap->dmacr;
uap->dmacr = dmacr & ~UART011_TXDMAE;
@@ -643,7 +640,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap)
}
desc = dmaengine_prep_slave_single(chan, dmatx->dma, dmatx->len, DMA_MEM_TO_DEV,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dma_unmap_single(dma_dev->dev, dmatx->dma, dmatx->len, DMA_TO_DEVICE);
uap->dmatx.queued = false;
@@ -832,8 +829,8 @@ static int pl011_dma_rx_trigger_dma(struct uart_amba_port *uap)
dbuf = uap->dmarx.use_buf_b ?
&uap->dmarx.dbuf_b : &uap->dmarx.dbuf_a;
desc = dmaengine_prep_slave_single(rxchan, dbuf->dma, dbuf->len,
- DMA_DEV_TO_MEM,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
/*
* If the DMA engine is busy and cannot prepare a
* channel, no big deal, the driver will fall back
@@ -889,14 +886,12 @@ static void pl011_dma_rx_chars(struct uart_amba_port *uap,
/* Pick the remain data from the DMA */
if (pending) {
-
/*
* First take all chars in the DMA pipe, then look in the FIFO.
* Note that tty_insert_flip_buf() tries to take as many chars
* as it can.
*/
- dma_count = tty_insert_flip_string(port, dbuf->buf + dmataken,
- pending);
+ dma_count = tty_insert_flip_string(port, dbuf->buf + dmataken, pending);
uap->port.icount.rx += dma_count;
if (dma_count < pending)
@@ -1072,7 +1067,7 @@ static void pl011_dma_rx_poll(struct timer_list *t)
dmataken = dbuf->len - dmarx->last_residue;
size = dmarx->last_residue - state.residue;
dma_count = tty_insert_flip_string(port, dbuf->buf + dmataken,
- size);
+ size);
if (dma_count == size)
dmarx->last_residue = state.residue;
dmarx->last_jiffies = jiffies;
@@ -1085,7 +1080,6 @@ static void pl011_dma_rx_poll(struct timer_list *t)
*/
if (jiffies_to_msecs(jiffies - dmarx->last_jiffies)
> uap->dmarx.poll_timeout) {
-
uart_port_lock_irqsave(&uap->port, &flags);
pl011_dma_rx_stop(uap);
uap->im |= UART011_RXIM;
@@ -1097,7 +1091,7 @@ static void pl011_dma_rx_poll(struct timer_list *t)
del_timer(&uap->dmarx.timer);
} else {
mod_timer(&uap->dmarx.timer,
- jiffies + msecs_to_jiffies(uap->dmarx.poll_rate));
+ jiffies + msecs_to_jiffies(uap->dmarx.poll_rate));
}
}
@@ -1129,7 +1123,7 @@ static void pl011_dma_startup(struct uart_amba_port *uap)
/* Allocate and map DMA RX buffers */
ret = pl011_dmabuf_init(uap->dmarx.chan, &uap->dmarx.dbuf_a,
- DMA_FROM_DEVICE);
+ DMA_FROM_DEVICE);
if (ret) {
dev_err(uap->port.dev, "failed to init DMA %s: %d\n",
"RX buffer A", ret);
@@ -1137,12 +1131,12 @@ static void pl011_dma_startup(struct uart_amba_port *uap)
}
ret = pl011_dmabuf_init(uap->dmarx.chan, &uap->dmarx.dbuf_b,
- DMA_FROM_DEVICE);
+ DMA_FROM_DEVICE);
if (ret) {
dev_err(uap->port.dev, "failed to init DMA %s: %d\n",
"RX buffer B", ret);
pl011_dmabuf_free(uap->dmarx.chan, &uap->dmarx.dbuf_a,
- DMA_FROM_DEVICE);
+ DMA_FROM_DEVICE);
goto skip_rx;
}
@@ -1169,8 +1163,7 @@ static void pl011_dma_startup(struct uart_amba_port *uap)
if (uap->dmarx.poll_rate) {
timer_setup(&uap->dmarx.timer, pl011_dma_rx_poll, 0);
mod_timer(&uap->dmarx.timer,
- jiffies +
- msecs_to_jiffies(uap->dmarx.poll_rate));
+ jiffies + msecs_to_jiffies(uap->dmarx.poll_rate));
uap->dmarx.last_residue = PL011_DMA_BUFFER_SIZE;
uap->dmarx.last_jiffies = jiffies;
}
@@ -1359,8 +1352,8 @@ static void pl011_stop_rx(struct uart_port *port)
struct uart_amba_port *uap =
container_of(port, struct uart_amba_port, port);
- uap->im &= ~(UART011_RXIM|UART011_RTIM|UART011_FEIM|
- UART011_PEIM|UART011_BEIM|UART011_OEIM);
+ uap->im &= ~(UART011_RXIM | UART011_RTIM | UART011_FEIM |
+ UART011_PEIM | UART011_BEIM | UART011_OEIM);
pl011_write(uap->im, uap, REG_IMSC);
pl011_dma_rx_stop(uap);
@@ -1380,7 +1373,7 @@ static void pl011_enable_ms(struct uart_port *port)
struct uart_amba_port *uap =
container_of(port, struct uart_amba_port, port);
- uap->im |= UART011_RIMIM|UART011_CTSMIM|UART011_DCDMIM|UART011_DSRMIM;
+ uap->im |= UART011_RIMIM | UART011_CTSMIM | UART011_DCDMIM | UART011_DSRMIM;
pl011_write(uap->im, uap, REG_IMSC);
}
@@ -1409,8 +1402,7 @@ __acquires(&uap->port.lock)
uap->dmarx.last_jiffies = jiffies;
uap->dmarx.last_residue = PL011_DMA_BUFFER_SIZE;
mod_timer(&uap->dmarx.timer,
- jiffies +
- msecs_to_jiffies(uap->dmarx.poll_rate));
+ jiffies + msecs_to_jiffies(uap->dmarx.poll_rate));
}
#endif
}
@@ -1557,18 +1549,17 @@ static irqreturn_t pl011_int(int irq, void *dev_id)
do {
check_apply_cts_event_workaround(uap);
- pl011_write(status & ~(UART011_TXIS|UART011_RTIS|
- UART011_RXIS),
+ pl011_write(status & ~(UART011_TXIS | UART011_RTIS | UART011_RXIS),
uap, REG_ICR);
- if (status & (UART011_RTIS|UART011_RXIS)) {
+ if (status & (UART011_RTIS | UART011_RXIS)) {
if (pl011_dma_rx_running(uap))
pl011_dma_rx_irq(uap);
else
pl011_rx_chars(uap);
}
- if (status & (UART011_DSRMIS|UART011_DCDMIS|
- UART011_CTSMIS|UART011_RIMIS))
+ if (status & (UART011_DSRMIS | UART011_DCDMIS |
+ UART011_CTSMIS | UART011_RIMIS))
pl011_modem_status(uap);
if (status & UART011_TXIS)
pl011_tx_chars(uap, true);
@@ -1707,8 +1698,7 @@ static int pl011_get_poll_char(struct uart_port *port)
return pl011_read(uap, REG_DR);
}
-static void pl011_put_poll_char(struct uart_port *port,
- unsigned char ch)
+static void pl011_put_poll_char(struct uart_port *port, unsigned char ch)
{
struct uart_amba_port *uap =
container_of(port, struct uart_amba_port, port);
@@ -1909,14 +1899,13 @@ static int sbsa_uart_startup(struct uart_port *port)
return 0;
}
-static void pl011_shutdown_channel(struct uart_amba_port *uap,
- unsigned int lcrh)
+static void pl011_shutdown_channel(struct uart_amba_port *uap, unsigned int lcrh)
{
- unsigned long val;
+ unsigned long val;
- val = pl011_read(uap, lcrh);
- val &= ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN);
- pl011_write(val, uap, lcrh);
+ val = pl011_read(uap, lcrh);
+ val &= ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN);
+ pl011_write(val, uap, lcrh);
}
/*
@@ -2065,7 +2054,7 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios,
uap->dmarx.poll_rate = DIV_ROUND_UP(10000000, baud);
#endif
- if (baud > port->uartclk/16)
+ if (baud > port->uartclk / 16)
quot = DIV_ROUND_CLOSEST(port->uartclk * 8, baud);
else
quot = DIV_ROUND_CLOSEST(port->uartclk * 4, baud);
@@ -2218,13 +2207,14 @@ static void pl011_config_port(struct uart_port *port, int flags)
static int pl011_verify_port(struct uart_port *port, struct serial_struct *ser)
{
int ret = 0;
+
if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
ret = -EINVAL;
if (ser->irq < 0 || ser->irq >= nr_irqs)
ret = -EINVAL;
if (ser->baud_base < 9600)
ret = -EINVAL;
- if (port->mapbase != (unsigned long) ser->iomem_base)
+ if (port->mapbase != (unsigned long)ser->iomem_base)
ret = -EINVAL;
return ret;
}
@@ -2613,7 +2603,9 @@ static int __init pl011_early_console_setup(struct earlycon_device *device,
return 0;
}
+
OF_EARLYCON_DECLARE(pl011, "arm,pl011", pl011_early_console_setup);
+
OF_EARLYCON_DECLARE(pl011, "arm,sbsa-uart", pl011_early_console_setup);
/*
@@ -2636,6 +2628,7 @@ qdf2400_e44_early_console_setup(struct earlycon_device *device,
device->con->write = qdf2400_e44_early_write;
return 0;
}
+
EARLYCON_DECLARE(qdf2400_e44, qdf2400_e44_early_console_setup);
#else
--
2.43.0
Fix the following messages from checkpatch:
$ ./scripts/checkpatch.pl --strict --file \
drivers/tty/serial/amba-pl011.c
ERROR: do not initialise statics to false
WARNING: Possible unnecessary 'out of memory' message
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
WARNING: Prefer [subsystem eg: netdev]_info([subsystem]dev, ... then
dev_info(dev, ... then pr_info(... to
CHECK: Prefer using the BIT macro
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Théo Lebrun <[email protected]>
---
drivers/tty/serial/amba-pl011.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 3c657bac2359..d141af8f8a5f 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -51,7 +51,7 @@
#define AMBA_ISR_PASS_LIMIT 256
#define UART_DR_ERROR (UART011_DR_OE | UART011_DR_BE | UART011_DR_PE | UART011_DR_FE)
-#define UART_DUMMY_DR_RX (1 << 16)
+#define UART_DUMMY_DR_RX BIT(16)
enum {
REG_DR,
@@ -1109,7 +1109,6 @@ static void pl011_dma_startup(struct uart_amba_port *uap)
uap->dmatx.buf = kmalloc(PL011_DMA_BUFFER_SIZE, GFP_KERNEL | __GFP_DMA);
if (!uap->dmatx.buf) {
- dev_err(uap->port.dev, "no memory for DMA TX buffer\n");
uap->port.fifosize = uap->fifosize;
return;
}
@@ -2528,7 +2527,7 @@ static void qdf2400_e44_putc(struct uart_port *port, unsigned char c)
cpu_relax();
}
-static void qdf2400_e44_early_write(struct console *con, const char *s, unsigned n)
+static void qdf2400_e44_early_write(struct console *con, const char *s, unsigned int n)
{
struct earlycon_device *dev = con->data;
@@ -2547,7 +2546,7 @@ static void pl011_putc(struct uart_port *port, unsigned char c)
cpu_relax();
}
-static void pl011_early_write(struct console *con, const char *s, unsigned n)
+static void pl011_early_write(struct console *con, const char *s, unsigned int n)
{
struct earlycon_device *dev = con->data;
@@ -2653,8 +2652,8 @@ static struct uart_driver amba_reg = {
static int pl011_probe_dt_alias(int index, struct device *dev)
{
struct device_node *np;
- static bool seen_dev_with_alias = false;
- static bool seen_dev_without_alias = false;
+ static bool seen_dev_with_alias;
+ static bool seen_dev_without_alias;
int ret = index;
if (!IS_ENABLED(CONFIG_OF))
@@ -2996,7 +2995,7 @@ static struct amba_driver pl011_driver = {
static int __init pl011_init(void)
{
- printk(KERN_INFO "Serial: AMBA PL011 UART driver\n");
+ pr_info("Serial: AMBA PL011 UART driver\n");
if (platform_driver_register(&arm_sbsa_uart_platform_driver))
pr_warn("could not register SBSA UART platform driver\n");
--
2.43.0
Remove all instances of quoted strings split across lines. Fix four
checkpatch warnings:
$ ./scripts/checkpatch.pl --strict --file \
drivers/tty/serial/amba-pl011.c
WARNING: quoted string split across lines
[...]
Reviewed-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Théo Lebrun <[email protected]>
---
drivers/tty/serial/amba-pl011.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 743dee75c68b..be8888db1a37 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -973,8 +973,8 @@ static void pl011_dma_rx_irq(struct uart_amba_port *uap)
/* Switch buffer & re-trigger DMA job */
dmarx->use_buf_b = !dmarx->use_buf_b;
if (pl011_dma_rx_trigger_dma(uap)) {
- dev_dbg(uap->port.dev, "could not retrigger RX DMA job "
- "fall back to interrupt mode\n");
+ dev_dbg(uap->port.dev,
+ "could not retrigger RX DMA job fall back to interrupt mode\n");
uap->im |= UART011_RXIM;
pl011_write(uap->im, uap, REG_IMSC);
}
@@ -1021,8 +1021,8 @@ static void pl011_dma_rx_callback(void *data)
* get some IRQ immediately from RX.
*/
if (ret) {
- dev_dbg(uap->port.dev, "could not retrigger RX DMA job "
- "fall back to interrupt mode\n");
+ dev_dbg(uap->port.dev,
+ "could not retrigger RX DMA job fall back to interrupt mode\n");
uap->im |= UART011_RXIM;
pl011_write(uap->im, uap, REG_IMSC);
}
@@ -1158,8 +1158,8 @@ static void pl011_dma_startup(struct uart_amba_port *uap)
if (uap->using_rx_dma) {
if (pl011_dma_rx_trigger_dma(uap))
- dev_dbg(uap->port.dev, "could not trigger initial "
- "RX DMA job, fall back to interrupt mode\n");
+ dev_dbg(uap->port.dev,
+ "could not trigger initial RX DMA job, fall back to interrupt mode\n");
if (uap->dmarx.poll_rate) {
timer_setup(&uap->dmarx.timer, pl011_dma_rx_poll, 0);
mod_timer(&uap->dmarx.timer,
@@ -1391,8 +1391,8 @@ __acquires(&uap->port.lock)
*/
if (pl011_dma_rx_available(uap)) {
if (pl011_dma_rx_trigger_dma(uap)) {
- dev_dbg(uap->port.dev, "could not trigger RX DMA job "
- "fall back to interrupt mode again\n");
+ dev_dbg(uap->port.dev,
+ "could not trigger RX DMA job fall back to interrupt mode again\n");
uap->im |= UART011_RXIM;
pl011_write(uap->im, uap, REG_IMSC);
} else {
--
2.43.0
Fix the following checkpatch warnings & checks:
$ ./scripts/checkpatch.pl --strict --file \
drivers/tty/serial/amba-pl011.c
CHECK: Unbalanced braces around else statement
CHECK: Unnecessary parentheses around '[...]'
CHECK: braces {} should be used on all arms of this statement
CHECK: Comparison to NULL could be written "[...]"
WARNING: Comparisons should place the constant on the right side of the test
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Théo Lebrun <[email protected]>
---
drivers/tty/serial/amba-pl011.c | 26 ++++++++++++++------------
1 file changed, 14 insertions(+), 12 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index be8888db1a37..3c657bac2359 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -330,10 +330,11 @@ static int pl011_fifo_to_tty(struct uart_amba_port *uap)
uap->port.icount.brk++;
if (uart_handle_break(&uap->port))
continue;
- } else if (ch & UART011_DR_PE)
+ } else if (ch & UART011_DR_PE) {
uap->port.icount.parity++;
- else if (ch & UART011_DR_FE)
+ } else if (ch & UART011_DR_FE) {
uap->port.icount.frame++;
+ }
if (ch & UART011_DR_OE)
uap->port.icount.overrun++;
@@ -464,7 +465,7 @@ static void pl011_dma_probe(struct uart_amba_port *uap)
* If the controller does, check for suitable residue processing
* otherwise assime all is well.
*/
- if (0 == dma_get_slave_caps(chan, &caps)) {
+ if (dma_get_slave_caps(chan, &caps) == 0) {
if (caps.residue_granularity ==
DMA_RESIDUE_GRANULARITY_DESCRIPTOR) {
dma_release_channel(chan);
@@ -503,11 +504,11 @@ static void pl011_dma_probe(struct uart_amba_port *uap)
if (uap->dmarx.auto_poll_rate) {
u32 x;
- if (0 == of_property_read_u32(dev->of_node, "poll-rate-ms", &x))
+ if (of_property_read_u32(dev->of_node, "poll-rate-ms", &x) == 0)
uap->dmarx.poll_rate = x;
else
uap->dmarx.poll_rate = 100;
- if (0 == of_property_read_u32(dev->of_node, "poll-timeout-ms", &x))
+ if (of_property_read_u32(dev->of_node, "poll-timeout-ms", &x) == 0)
uap->dmarx.poll_timeout = x;
else
uap->dmarx.poll_timeout = 3000;
@@ -615,9 +616,9 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap)
if (count > PL011_DMA_BUFFER_SIZE)
count = PL011_DMA_BUFFER_SIZE;
- if (xmit->tail < xmit->head)
+ if (xmit->tail < xmit->head) {
memcpy(&dmatx->buf[0], &xmit->buf[xmit->tail], count);
- else {
+ } else {
size_t first = UART_XMIT_SIZE - xmit->tail;
size_t second;
@@ -751,8 +752,9 @@ static inline bool pl011_dma_tx_start(struct uart_amba_port *uap)
if (pl011_dma_tx_refill(uap) > 0) {
uap->im &= ~UART011_TXIM;
pl011_write(uap->im, uap, REG_IMSC);
- } else
+ } else {
ret = false;
+ }
} else if (!(uap->dmacr & UART011_TXDMAE)) {
uap->dmacr |= UART011_TXDMAE;
pl011_write(uap->dmacr, uap, REG_DMACR);
@@ -2139,9 +2141,9 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios,
* else we see data corruption.
*/
if (uap->vendor->oversampling) {
- if ((baud >= 3000000) && (baud < 3250000) && (quot > 1))
+ if (baud >= 3000000 && baud < 3250000 && quot > 1)
quot -= 1;
- else if ((baud > 3250000) && (quot > 2))
+ else if (baud > 3250000 && quot > 2)
quot -= 2;
}
/* Set baud rate */
@@ -2668,7 +2670,7 @@ static int pl011_probe_dt_alias(int index, struct device *dev)
ret = index;
} else {
seen_dev_with_alias = true;
- if (ret >= ARRAY_SIZE(amba_ports) || amba_ports[ret] != NULL) {
+ if (ret >= ARRAY_SIZE(amba_ports) || amba_ports[ret]) {
dev_warn(dev, "requested serial port %d not available.\n", ret);
ret = index;
}
@@ -2702,7 +2704,7 @@ static int pl011_find_free_port(void)
int i;
for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
- if (amba_ports[i] == NULL)
+ if (!amba_ports[i])
return i;
return -EBUSY;
--
2.43.0
The driver uses two TIOCMBIT macros inside pl011_{get,set}_mctrl to
simplify the logic. Those look scary to checkpatch because they contain
ifs without do-while loops.
Avoid the macros by creating small equivalent static functions; that
lets the compiler do its type checking & avoids checkpatch errors.
For the second instance __assign_bit is not usable because it deals with
unsigned long pointers whereas we have an unsigned int in
pl011_set_mctrl.
This addresses the following checkpatch warnings:
$ ./scripts/checkpatch.pl --strict --file \
drivers/tty/serial/amba-pl011.c
ERROR: Macros starting with if should be enclosed by a do -
while loop to avoid possible if/else logic defects
CHECK: Macro argument 'uartbit' may be better as '(uartbit)' to
avoid precedence issues
ERROR: Macros starting with if should be enclosed by a do - while
loop to avoid possible if/else logic defects
CHECK: Macro argument 'tiocmbit' may be better as '(tiocmbit)' to
avoid precedence issues
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Théo Lebrun <[email protected]>
---
drivers/tty/serial/amba-pl011.c | 45 ++++++++++++++++++++++-------------------
1 file changed, 24 insertions(+), 21 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 7bd0b68ef92f..743dee75c68b 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1589,6 +1589,12 @@ static unsigned int pl011_tx_empty(struct uart_port *port)
0 : TIOCSER_TEMT;
}
+static void pl011_maybe_set_bit(bool cond, unsigned int *ptr, unsigned int mask)
+{
+ if (cond)
+ *ptr |= mask;
+}
+
static unsigned int pl011_get_mctrl(struct uart_port *port)
{
struct uart_amba_port *uap =
@@ -1596,18 +1602,22 @@ static unsigned int pl011_get_mctrl(struct uart_port *port)
unsigned int result = 0;
unsigned int status = pl011_read(uap, REG_FR);
-#define TIOCMBIT(uartbit, tiocmbit) \
- if (status & uartbit) \
- result |= tiocmbit
+ pl011_maybe_set_bit(status & UART01x_FR_DCD, &result, TIOCM_CAR);
+ pl011_maybe_set_bit(status & uap->vendor->fr_dsr, &result, TIOCM_DSR);
+ pl011_maybe_set_bit(status & uap->vendor->fr_cts, &result, TIOCM_CTS);
+ pl011_maybe_set_bit(status & uap->vendor->fr_ri, &result, TIOCM_RNG);
- TIOCMBIT(UART01x_FR_DCD, TIOCM_CAR);
- TIOCMBIT(uap->vendor->fr_dsr, TIOCM_DSR);
- TIOCMBIT(uap->vendor->fr_cts, TIOCM_CTS);
- TIOCMBIT(uap->vendor->fr_ri, TIOCM_RNG);
-#undef TIOCMBIT
return result;
}
+static void pl011_assign_bit(bool cond, unsigned int *ptr, unsigned int mask)
+{
+ if (cond)
+ *ptr |= mask;
+ else
+ *ptr &= ~mask;
+}
+
static void pl011_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_amba_port *uap =
@@ -1616,23 +1626,16 @@ static void pl011_set_mctrl(struct uart_port *port, unsigned int mctrl)
cr = pl011_read(uap, REG_CR);
-#define TIOCMBIT(tiocmbit, uartbit) \
- if (mctrl & tiocmbit) \
- cr |= uartbit; \
- else \
- cr &= ~uartbit
-
- TIOCMBIT(TIOCM_RTS, UART011_CR_RTS);
- TIOCMBIT(TIOCM_DTR, UART011_CR_DTR);
- TIOCMBIT(TIOCM_OUT1, UART011_CR_OUT1);
- TIOCMBIT(TIOCM_OUT2, UART011_CR_OUT2);
- TIOCMBIT(TIOCM_LOOP, UART011_CR_LBE);
+ pl011_assign_bit(mctrl & TIOCM_RTS, &cr, UART011_CR_RTS);
+ pl011_assign_bit(mctrl & TIOCM_DTR, &cr, UART011_CR_DTR);
+ pl011_assign_bit(mctrl & TIOCM_OUT1, &cr, UART011_CR_OUT1);
+ pl011_assign_bit(mctrl & TIOCM_OUT2, &cr, UART011_CR_OUT2);
+ pl011_assign_bit(mctrl & TIOCM_LOOP, &cr, UART011_CR_LBE);
if (port->status & UPSTAT_AUTORTS) {
/* We need to disable auto-RTS if we want to turn RTS off */
- TIOCMBIT(TIOCM_RTS, UART011_CR_RTSEN);
+ pl011_assign_bit(mctrl & TIOCM_RTS, &cr, UART011_CR_RTSEN);
}
-#undef TIOCMBIT
pl011_write(cr, uap, REG_CR);
}
--
2.43.0
On this platform, different vendor data is used. That requires a
compile-time check as we access (1) a global boolean & (2) our local
vendor data. Both symbols are accessible only when
CONFIG_ACPI_SPCR_TABLE is enabled.
Factor the vendor data overriding to a separate function that is empty
when CONFIG_ACPI_SPCR_TABLE is not defined.
Suggested-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Théo Lebrun <[email protected]>
---
drivers/tty/serial/amba-pl011.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index fe910c5f3489..d50e3c14b0e4 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2869,6 +2869,22 @@ static int pl011_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(pl011_dev_pm_ops, pl011_suspend, pl011_resume);
+#ifdef CONFIG_ACPI_SPCR_TABLE
+static void qpdf2400_erratum44_workaround(struct device *dev,
+ struct uart_amba_port *uap)
+{
+ if (!qdf2400_e44_present)
+ return;
+
+ dev_info(dev, "working around QDF2400 SoC erratum 44\n");
+ uap->vendor = &vendor_qdt_qdf2400_e44;
+}
+#else
+static void qpdf2400_erratum44_workaround(struct device *dev,
+ struct uart_amba_port *uap)
+{ /* empty */ }
+#endif
+
static int sbsa_uart_probe(struct platform_device *pdev)
{
struct uart_amba_port *uap;
@@ -2904,13 +2920,8 @@ static int sbsa_uart_probe(struct platform_device *pdev)
return ret;
uap->port.irq = ret;
-#ifdef CONFIG_ACPI_SPCR_TABLE
- if (qdf2400_e44_present) {
- dev_info(&pdev->dev, "working around QDF2400 SoC erratum 44\n");
- uap->vendor = &vendor_qdt_qdf2400_e44;
- } else
-#endif
- uap->vendor = &vendor_sbsa;
+ uap->vendor = &vendor_sbsa;
+ qpdf2400_erratum44_workaround(&pdev->dev, uap);
uap->reg_offset = uap->vendor->reg_offset;
uap->fifosize = 32;
--
2.43.0
The whole function body is encapsulated inside an if-condition. Reverse
the if logic and early return to remove one indentation level.
Also turn two nested ifs into a single one at the end of the function.
Reviewed-by: Linus Walleij <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Théo Lebrun <[email protected]>
---
drivers/tty/serial/amba-pl011.c | 43 ++++++++++++++++++++---------------------
1 file changed, 21 insertions(+), 22 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index d141af8f8a5f..fe910c5f3489 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2363,35 +2363,34 @@ pl011_console_write(struct console *co, const char *s, unsigned int count)
static void pl011_console_get_options(struct uart_amba_port *uap, int *baud,
int *parity, int *bits)
{
- if (pl011_read(uap, REG_CR) & UART01x_CR_UARTEN) {
- unsigned int lcr_h, ibrd, fbrd;
+ unsigned int lcr_h, ibrd, fbrd;
- lcr_h = pl011_read(uap, REG_LCRH_TX);
+ if (!(pl011_read(uap, REG_CR) & UART01x_CR_UARTEN))
+ return;
- *parity = 'n';
- if (lcr_h & UART01x_LCRH_PEN) {
- if (lcr_h & UART01x_LCRH_EPS)
- *parity = 'e';
- else
- *parity = 'o';
- }
+ lcr_h = pl011_read(uap, REG_LCRH_TX);
- if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
- *bits = 7;
+ *parity = 'n';
+ if (lcr_h & UART01x_LCRH_PEN) {
+ if (lcr_h & UART01x_LCRH_EPS)
+ *parity = 'e';
else
- *bits = 8;
+ *parity = 'o';
+ }
- ibrd = pl011_read(uap, REG_IBRD);
- fbrd = pl011_read(uap, REG_FBRD);
+ if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
+ *bits = 7;
+ else
+ *bits = 8;
- *baud = uap->port.uartclk * 4 / (64 * ibrd + fbrd);
+ ibrd = pl011_read(uap, REG_IBRD);
+ fbrd = pl011_read(uap, REG_FBRD);
- if (uap->vendor->oversampling) {
- if (pl011_read(uap, REG_CR)
- & ST_UART011_CR_OVSFACT)
- *baud *= 2;
- }
- }
+ *baud = uap->port.uartclk * 4 / (64 * ibrd + fbrd);
+
+ if (uap->vendor->oversampling &&
+ (pl011_read(uap, REG_CR) & ST_UART011_CR_OVSFACT))
+ *baud *= 2;
}
static int pl011_console_setup(struct console *co, char *options)
--
2.43.0