In preparation for interrupt support, switch to a spinlock rather than a mutex. Signed-off-by: Eddie James <eajames@xxxxxxxxxxxxx> --- drivers/fsi/fsi-master-aspeed.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c index 83f84ee6d6f4..1cb5bf6c05d2 100644 --- a/drivers/fsi/fsi-master-aspeed.c +++ b/drivers/fsi/fsi-master-aspeed.c @@ -8,11 +8,11 @@ #include <linux/io.h> #include <linux/mfd/syscon.h> #include <linux/module.h> -#include <linux/mutex.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/slab.h> +#include <linux/spinlock.h> #include <linux/iopoll.h> #include <linux/gpio/consumer.h> @@ -24,7 +24,7 @@ struct fsi_master_aspeed_data { struct fsi_master_aspeed { struct fsi_master master; - struct mutex lock; /* protect HW access */ + spinlock_t lock; /* protect HW access */ struct device *dev; void __iomem *base; struct clk *clk; @@ -245,6 +245,7 @@ static int aspeed_master_read(struct fsi_master *master, int link, uint8_t id, uint32_t addr, void *val, size_t size) { struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master); + unsigned long flags; int ret; if (id > 0x3) @@ -253,7 +254,7 @@ static int aspeed_master_read(struct fsi_master *master, int link, addr |= id << 21; addr += link * FSI_HUB_LINK_SIZE; - mutex_lock(&aspeed->lock); + spin_lock_irqsave(&aspeed->lock, flags); switch (size) { case 1: @@ -272,7 +273,7 @@ static int aspeed_master_read(struct fsi_master *master, int link, ret = check_errors(aspeed, ret); done: - mutex_unlock(&aspeed->lock); + spin_unlock_irqrestore(&aspeed->lock, flags); return ret; } @@ -280,6 +281,7 @@ static int aspeed_master_write(struct fsi_master *master, int link, uint8_t id, uint32_t addr, const void *val, size_t size) { struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master); + unsigned long flags; int ret; if (id > 0x3) @@ -288,7 +290,7 @@ static int aspeed_master_write(struct fsi_master *master, int link, addr |= id << 21; addr += link * FSI_HUB_LINK_SIZE; - mutex_lock(&aspeed->lock); + spin_lock_irqsave(&aspeed->lock, flags); switch (size) { case 1: @@ -307,7 +309,7 @@ static int aspeed_master_write(struct fsi_master *master, int link, ret = check_errors(aspeed, ret); done: - mutex_unlock(&aspeed->lock); + spin_unlock_irqrestore(&aspeed->lock, flags); return ret; } @@ -369,15 +371,16 @@ static ssize_t cfam_reset_store(struct device *dev, struct device_attribute *att const char *buf, size_t count) { struct fsi_master_aspeed *aspeed = dev_get_drvdata(dev); + unsigned long flags; trace_fsi_master_aspeed_cfam_reset(true); - mutex_lock(&aspeed->lock); + spin_lock_irqsave(&aspeed->lock, flags); gpiod_set_value(aspeed->cfam_reset_gpio, 1); - usleep_range(900, 1000); + udelay(900); gpiod_set_value(aspeed->cfam_reset_gpio, 0); - usleep_range(900, 1000); + udelay(900); opb_writel(aspeed, ctrl_base + FSI_MRESP0, cpu_to_be32(FSI_MRESP_RST_ALL_MASTER)); - mutex_unlock(&aspeed->lock); + spin_unlock_irqrestore(&aspeed->lock, flags); trace_fsi_master_aspeed_cfam_reset(false); return count; @@ -468,6 +471,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev) return -ENOMEM; aspeed->dev = &pdev->dev; + spin_lock_init(&aspeed->lock); aspeed->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(aspeed->base)) { @@ -543,7 +547,6 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev) dev_set_drvdata(&pdev->dev, aspeed); - mutex_init(&aspeed->lock); rc = fsi_master_init(&aspeed->master, clk_get_rate(aspeed->clk)); if (rc) goto err_regmap; -- 2.39.3