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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>
This commit is contained in:
Fabien Dessenne 2019-03-07 16:42:16 +01:00 committed by Bjorn Andersson
parent fbd7330c9f
commit 5cd69f13de
1 changed files with 7 additions and 0 deletions
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7
drivers/hwspinlock/stm32_hwspinlock.c
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@ -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)