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authorAxel Lin <axel.lin@ingics.com>2015-02-27 06:50:57 +0300
committerKishon Vijay Abraham I <kishon@ti.com>2015-03-11 13:21:06 +0300
commitaf69decc7ca80fa24c77a5a00234f1cd2a957de8 (patch)
tree8f03178f14090d519d6e01b5026159d8a10f2955 /drivers/phy
parentcfd565d1e102941ec61b2a33c3c474961300a6fb (diff)
downloadlinux-af69decc7ca80fa24c77a5a00234f1cd2a957de8.tar.xz
phy: exynos-mipi-video: Use spin_lock to protct state->regmap rmw operations
The state->regmap is initialized by devm_regmap_init_mmio(). So it's fine to use spin_lock rather than mutex to protct state->regmap rmw operations. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Tested-by: Sylwester Nawrocki <s.nawrocki@samsung.com> [Julia.Lawall@lip6.fr: Found an issue with the original patch w.r.t unbalanced spin_lock call] Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/phy-exynos-mipi-video.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/phy/phy-exynos-mipi-video.c b/drivers/phy/phy-exynos-mipi-video.c
index d19649328d05..df7519a39ba0 100644
--- a/drivers/phy/phy-exynos-mipi-video.c
+++ b/drivers/phy/phy-exynos-mipi-video.c
@@ -43,7 +43,6 @@ struct exynos_mipi_video_phy {
} phys[EXYNOS_MIPI_PHYS_NUM];
spinlock_t slock;
void __iomem *regs;
- struct mutex mutex;
struct regmap *regmap;
};
@@ -59,8 +58,9 @@ static int __set_phy_state(struct exynos_mipi_video_phy *state,
else
reset = EXYNOS4_MIPI_PHY_SRESETN;
+ spin_lock(&state->slock);
+
if (!IS_ERR(state->regmap)) {
- mutex_lock(&state->mutex);
regmap_read(state->regmap, offset, &val);
if (on)
val |= reset;
@@ -72,11 +72,9 @@ static int __set_phy_state(struct exynos_mipi_video_phy *state,
else if (!(val & EXYNOS4_MIPI_PHY_RESET_MASK))
val &= ~EXYNOS4_MIPI_PHY_ENABLE;
regmap_write(state->regmap, offset, val);
- mutex_unlock(&state->mutex);
} else {
addr = state->regs + EXYNOS_MIPI_PHY_CONTROL(id / 2);
- spin_lock(&state->slock);
val = readl(addr);
if (on)
val |= reset;
@@ -90,9 +88,9 @@ static int __set_phy_state(struct exynos_mipi_video_phy *state,
val &= ~EXYNOS4_MIPI_PHY_ENABLE;
writel(val, addr);
- spin_unlock(&state->slock);
}
+ spin_unlock(&state->slock);
return 0;
}
@@ -158,7 +156,6 @@ static int exynos_mipi_video_phy_probe(struct platform_device *pdev)
dev_set_drvdata(dev, state);
spin_lock_init(&state->slock);
- mutex_init(&state->mutex);
for (i = 0; i < EXYNOS_MIPI_PHYS_NUM; i++) {
struct phy *phy = devm_phy_create(dev, NULL,