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Code Issues Releases Wiki Activity

serial/amba-pl011: move custom pin control to driver

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We had a boot regression in Ux500 in the merge window because
two orthogonal pin control schemes for the PL011 were merged
at the same time:

- One using the .init() and .exit() hooks into the platform
  for Ux500 putting the pins into default vs sleep state
  respectively as the port was started/stopped.
  commit a09806607f
  "ARM: ux500: switch to using pinctrl for uart0"

- One hogging the default setting at PL011 probe()
  commit 258e055111
  "serial: amba-pl011: adopt pinctrl support"

To get a solution that works for both let's scrap the stuff
in the platform callbacks, instead have the driver itself
select default and sleep states when the port is
started/stopped. Hopefully this works for all clients.
Platform callbacks are bad for device tree migration anyway,
so this rids us of another problem in Ux500.

Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Reported-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Walleij 2012-05-23 21:18:46 +02:00 committed by Greg Kroah-Hartman
parent f109293f58
commit 78d80c5a72
2 changed files with 42 additions and 57 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

54
arch/arm/mach-ux500/board-mop500.c
View file

@ -580,43 +580,12 @@ static void ux500_uart0_reset(void)
udelay(1);
}
/* This needs to be referenced by callbacks */
struct pinctrl *u0_p;
struct pinctrl_state *u0_def;
struct pinctrl_state *u0_sleep;
static void ux500_uart0_init(void)
{
int ret;
if (IS_ERR(u0_p) || IS_ERR(u0_def))
return;
ret = pinctrl_select_state(u0_p, u0_def);
if (ret)
pr_err("could not set UART0 defstate\n");
}
static void ux500_uart0_exit(void)
{
int ret;
if (IS_ERR(u0_p) || IS_ERR(u0_sleep))
return;
ret = pinctrl_select_state(u0_p, u0_sleep);
if (ret)
pr_err("could not set UART0 idlestate\n");
}
static struct amba_pl011_data uart0_plat = {
#ifdef CONFIG_STE_DMA40
.dma_filter = stedma40_filter,
.dma_rx_param = &uart0_dma_cfg_rx,
.dma_tx_param = &uart0_dma_cfg_tx,
#endif
.init = ux500_uart0_init,
.exit = ux500_uart0_exit,
.reset = ux500_uart0_reset,
};
@ -638,28 +607,7 @@ static struct amba_pl011_data uart2_plat = {
static void __init mop500_uart_init(struct device *parent)
{
struct amba_device *uart0_device;
uart0_device = db8500_add_uart0(parent, &uart0_plat);
if (uart0_device) {
u0_p = pinctrl_get(&uart0_device->dev);
if (IS_ERR(u0_p))
dev_err(&uart0_device->dev,
"could not get UART0 pinctrl\n");
else {
u0_def = pinctrl_lookup_state(u0_p,
PINCTRL_STATE_DEFAULT);
if (IS_ERR(u0_def)) {
dev_err(&uart0_device->dev,
"could not get UART0 defstate\n");
}
u0_sleep = pinctrl_lookup_state(u0_p,
PINCTRL_STATE_SLEEP);
if (IS_ERR(u0_sleep))
dev_err(&uart0_device->dev,
"could not get UART0 idlestate\n");
}
}
db8500_add_uart0(parent, &uart0_plat);
db8500_add_uart1(parent, &uart1_plat);
db8500_add_uart2(parent, &uart2_plat);
}

45
drivers/tty/serial/amba-pl011.c
View file

@ -133,6 +133,10 @@ struct pl011_dmatx_data {
struct uart_amba_port {
struct uart_port port;
struct clk *clk;
/* Two optional pin states - default & sleep */
struct pinctrl *pinctrl;
struct pinctrl_state *pins_default;
struct pinctrl_state *pins_sleep;
const struct vendor_data *vendor;
unsigned int dmacr; /* dma control reg */
unsigned int im; /* interrupt mask */
@ -1312,6 +1316,14 @@ static int pl011_startup(struct uart_port *port)
unsigned int cr;
int retval;
/* Optionaly enable pins to be muxed in and configured */
if (!IS_ERR(uap->pins_default)) {
retval = pinctrl_select_state(uap->pinctrl, uap->pins_default);
if (retval)
dev_err(port->dev,
"could not set default pins\n");
}
retval = clk_prepare(uap->clk);
if (retval)
goto out;
@ -1420,6 +1432,7 @@ static void pl011_shutdown(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int cr;
int retval;
/*
* disable all interrupts
@ -1462,6 +1475,14 @@ static void pl011_shutdown(struct uart_port *port)
*/
clk_disable(uap->clk);
clk_unprepare(uap->clk);
/* Optionally let pins go into sleep states */
if (!IS_ERR(uap->pins_sleep)) {
retval = pinctrl_select_state(uap->pinctrl, uap->pins_sleep);
if (retval)
dev_err(port->dev,
"could not set pins to sleep state\n");
}
if (uap->port.dev->platform_data) {
struct amba_pl011_data *plat;
@ -1792,6 +1813,14 @@ static int __init pl011_console_setup(struct console *co, char *options)
if (!uap)
return -ENODEV;
/* Allow pins to be muxed in and configured */
if (!IS_ERR(uap->pins_default)) {
ret = pinctrl_select_state(uap->pinctrl, uap->pins_default);
if (ret)
dev_err(uap->port.dev,
"could not set default pins\n");
}
ret = clk_prepare(uap->clk);
if (ret)
return ret;
@ -1844,7 +1873,6 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
{
struct uart_amba_port *uap;
struct vendor_data *vendor = id->data;
struct pinctrl *pinctrl;
void __iomem *base;
int i, ret;
@ -1869,11 +1897,20 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
goto free;
}
pinctrl = devm_pinctrl_get_select_default(&dev->dev);
if (IS_ERR(pinctrl)) {
ret = PTR_ERR(pinctrl);
uap->pinctrl = devm_pinctrl_get(&dev->dev);
if (IS_ERR(uap->pinctrl)) {
ret = PTR_ERR(uap->pinctrl);
goto unmap;
}
uap->pins_default = pinctrl_lookup_state(uap->pinctrl,
PINCTRL_STATE_DEFAULT);
if (IS_ERR(uap->pins_default))
dev_err(&dev->dev, "could not get default pinstate\n");
uap->pins_sleep = pinctrl_lookup_state(uap->pinctrl,
PINCTRL_STATE_SLEEP);
if (IS_ERR(uap->pins_sleep))
dev_dbg(&dev->dev, "could not get sleep pinstate\n");
uap->clk = clk_get(&dev->dev, NULL);
if (IS_ERR(uap->clk)) {