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| author | Fabien Dessenne <fabien.dessenne@st.com> | 2019-03-07 16:42:16 +0100 |
|---|---|---|
| committer | Bjorn Andersson <bjorn.andersson@linaro.org> | 2019-06-29 21:04:24 -0700 |
| commit | 5cd69f13deef804d113d31c5c744396b1a1b8a9a (patch) | |
| tree | ffd22095935db3e3032910e29490bb0654926655 /drivers/hwspinlock | |
| parent | fbd7330c9fd8ef00bf231ec7e57b0f05384f462d (diff) | |
| download | lwn-5cd69f13deef804d113d31c5c744396b1a1b8a9a.tar.gz lwn-5cd69f13deef804d113d31c5c744396b1a1b8a9a.zip | |
hwspinlock: stm32: implement the relax() ops
Implement this optional ops, called by hwspinlock core while spinning on
a lock, between two successive invocations of trylock().
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/hwspinlock')
| -rw-r--r-- | drivers/hwspinlock/stm32_hwspinlock.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/hwspinlock/stm32_hwspinlock.c b/drivers/hwspinlock/stm32_hwspinlock.c index 441839288893..c8eacf4f9692 100644 --- a/drivers/hwspinlock/stm32_hwspinlock.c +++ b/drivers/hwspinlock/stm32_hwspinlock.c @@ -5,6 +5,7 @@ */ #include <linux/clk.h> +#include <linux/delay.h> #include <linux/hwspinlock.h> #include <linux/io.h> #include <linux/kernel.h> @@ -42,9 +43,15 @@ static void stm32_hwspinlock_unlock(struct hwspinlock *lock) writel(STM32_MUTEX_COREID, lock_addr); } +static void stm32_hwspinlock_relax(struct hwspinlock *lock) +{ + ndelay(50); +} + static const struct hwspinlock_ops stm32_hwspinlock_ops = { .trylock = stm32_hwspinlock_trylock, .unlock = stm32_hwspinlock_unlock, + .relax = stm32_hwspinlock_relax, }; static int stm32_hwspinlock_probe(struct platform_device *pdev) |