phy: exynos-mipi-video: simplify check for coupled phy status

There is no need to access regmap of coupled phy to check its state - such
information is already in the phy device itself, so use it directly. This
let us to avoid possible access to registers of the device in the disabled
power domain if the coupled phy is already disabled.

Signed-off-by: Marek Szyprowski <[e-mail]>
Acked-by: Sylwester Nawrocki <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/phy-exynos-mipi-video.c

···
 	spinlock_t slock;
 };
 
-static inline int __is_running(const struct exynos_mipi_phy_desc *data,
-			struct exynos_mipi_video_phy *state)
-{
-	u32 val;
-	int ret;
-
-	ret = regmap_read(state->regmaps[data->resetn_map], data->resetn_reg, &val);
-	if (ret)
-		return 0;
-
-	return val & data->resetn_val;
-}
-
 static int __set_phy_state(const struct exynos_mipi_phy_desc *data,
 			   struct exynos_mipi_video_phy *state, unsigned int on)
 {
···
 
 	/* disable in PMU sysreg */
 	if (!on && data->coupled_phy_id >= 0 &&
-	    !__is_running(state->phys[data->coupled_phy_id].data, state)) {
+	    state->phys[data->coupled_phy_id].phy->power_count == 0) {
 		regmap_read(state->regmaps[data->enable_map], data->enable_reg,
 			    &val);
 		val &= ~data->enable_val;