AuxXxilium/linux_dsm_epyc7002
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phy: exynos-mipi-video: Use spin_lock to protct state->regmap rmw operations

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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>
This commit is contained in:
Axel Lin 2015-02-27 11:50:57 +08:00 committed by Kishon Vijay Abraham I
parent cfd565d1e1
commit af69decc7c
1 changed files with 3 additions and 6 deletions
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9
drivers/phy/phy-exynos-mipi-video.c
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@ -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,