diff options
Diffstat (limited to 'drivers/fsi')
| -rw-r--r-- | drivers/fsi/fsi-master-gpio.c | 48 |
1 files changed, 23 insertions, 25 deletions
diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c index da556da62846..084e9da8d151 100644 --- a/drivers/fsi/fsi-master-gpio.c +++ b/drivers/fsi/fsi-master-gpio.c @@ -8,11 +8,11 @@ #include <linux/fsi.h> #include <linux/gpio/consumer.h> #include <linux/io.h> +#include <linux/irqflags.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/slab.h> -#include <linux/spinlock.h> #include "fsi-master.h" @@ -56,7 +56,6 @@ struct fsi_master_gpio { struct fsi_master master; struct device *dev; struct mutex cmd_lock; /* mutex for command ordering */ - spinlock_t bit_lock; /* lock for clocking bits out */ struct gpio_desc *gpio_clk; struct gpio_desc *gpio_data; struct gpio_desc *gpio_trans; /* Voltage translator */ @@ -367,7 +366,7 @@ static int read_one_response(struct fsi_master_gpio *master, uint8_t tag; int i; - spin_lock_irqsave(&master->bit_lock, flags); + local_irq_save(flags); /* wait for the start bit */ for (i = 0; i < FSI_GPIO_MTOE_COUNT; i++) { @@ -380,7 +379,7 @@ static int read_one_response(struct fsi_master_gpio *master, if (i == FSI_GPIO_MTOE_COUNT) { dev_dbg(master->dev, "Master time out waiting for response\n"); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); return -ETIMEDOUT; } @@ -399,7 +398,7 @@ static int read_one_response(struct fsi_master_gpio *master, /* read CRC */ serial_in(master, &msg, FSI_GPIO_CRC_SIZE); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); /* we have a whole message now; check CRC */ crc = crc4(0, 1, 1); @@ -430,10 +429,10 @@ static int issue_term(struct fsi_master_gpio *master, uint8_t slave) build_term_command(&cmd, slave); - spin_lock_irqsave(&master->bit_lock, flags); + local_irq_save(flags); serial_out(master, &cmd); echo_delay(master); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); rc = read_one_response(master, 0, NULL, &tag); if (rc < 0) { @@ -475,11 +474,11 @@ retry: "CRC error retry %d\n", crc_err_retries); trace_fsi_master_gpio_crc_rsp_error(master); build_epoll_command(&cmd, slave); - spin_lock_irqsave(&master->bit_lock, flags); + local_irq_save(flags); clock_zeros(master, FSI_GPIO_EPOLL_CLOCKS); serial_out(master, &cmd); echo_delay(master); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); goto retry; } else if (rc) goto fail; @@ -506,18 +505,18 @@ retry: */ if (busy_count++ < FSI_GPIO_MAX_BUSY) { build_dpoll_command(&cmd, slave); - spin_lock_irqsave(&master->bit_lock, flags); + local_irq_save(flags); clock_zeros(master, FSI_GPIO_DPOLL_CLOCKS); serial_out(master, &cmd); echo_delay(master); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); goto retry; } dev_warn(master->dev, "ERR slave is stuck in busy state, issuing TERM\n"); - spin_lock_irqsave(&master->bit_lock, flags); + local_irq_save(flags); clock_zeros(master, FSI_GPIO_DPOLL_CLOCKS); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); issue_term(master, slave); rc = -EIO; break; @@ -537,9 +536,10 @@ retry: trace_fsi_master_gpio_poll_response_busy(master, busy_count); fail: /* Clock the slave enough to be ready for next operation */ - spin_lock_irqsave(&master->bit_lock, flags); + local_irq_save(flags); clock_zeros(master, FSI_GPIO_PRIME_SLAVE_CLOCKS); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); + return rc; } @@ -548,15 +548,13 @@ static int send_request(struct fsi_master_gpio *master, { unsigned long flags; - spin_lock_irqsave(&master->bit_lock, flags); - if (master->external_mode) { - spin_unlock_irqrestore(&master->bit_lock, flags); + if (master->external_mode) return -EBUSY; - } + local_irq_save(flags); serial_out(master, cmd); echo_delay(master); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); return 0; } @@ -656,7 +654,7 @@ static int fsi_master_gpio_break(struct fsi_master *_master, int link) return -EBUSY; } - spin_lock_irqsave(&master->bit_lock, flags); + local_irq_save(flags); set_sda_output(master, 1); sda_out(master, 1); @@ -667,7 +665,8 @@ static int fsi_master_gpio_break(struct fsi_master *_master, int link) sda_out(master, 1); clock_toggle(master, FSI_POST_BREAK_CLOCKS); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); + last_address_update(master, 0, false, 0); mutex_unlock(&master->cmd_lock); @@ -688,9 +687,9 @@ static void fsi_master_gpio_init(struct fsi_master_gpio *master) gpiod_direction_output(master->gpio_data, 1); /* todo: evaluate if clocks can be reduced */ - spin_lock_irqsave(&master->bit_lock, flags); + local_irq_save(flags); clock_zeros(master, FSI_INIT_CLOCKS); - spin_unlock_irqrestore(&master->bit_lock, flags); + local_irq_restore(flags); } static void fsi_master_gpio_init_external(struct fsi_master_gpio *master) @@ -832,7 +831,6 @@ static int fsi_master_gpio_probe(struct platform_device *pdev) master->master.send_break = fsi_master_gpio_break; master->master.link_enable = fsi_master_gpio_link_enable; platform_set_drvdata(pdev, master); - spin_lock_init(&master->bit_lock); mutex_init(&master->cmd_lock); fsi_master_gpio_init(master); |