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>

diff --git a/drivers/phy/phy-exynos-mipi-video.c b/drivers/phy/phy-exynos-mipi-video.c
index d196493..df7519a 100644 (file)
--- 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,