drm/bridge/sii8620: improve on/off sequence

The patch puts clock management into on/off functions and adds neccessary
delay after regulator enable.

Change-Id: I4fc052eb21058e787355a8f2dfeb75b05a5d5341
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>

diff --git a/drivers/gpu/drm/bridge/sii8620.c b/drivers/gpu/drm/bridge/sii8620.c
index f4b3056..9c2303f 100644 (file)
--- a/drivers/gpu/drm/bridge/sii8620.c
+++ b/drivers/gpu/drm/bridge/sii8620.c
@@ -619,12 +619,13 @@ static int sii8620_hw_on(struct sii8620 *ctx)
        ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
        if (ret)
                return ret;
-
-       return 0;
+       usleep_range(10000, 20000);
+       return clk_prepare_enable(ctx->clk_xtal);
 }
 
 static int sii8620_hw_off(struct sii8620 *ctx)
 {
+       clk_disable_unprepare(ctx->clk_xtal);
        gpiod_set_value(ctx->gpio_reset, 1);
        return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 }
@@ -1403,7 +1404,6 @@ static void sii8620_cable_in(struct sii8620 *ctx)
        int ret;
 
        sii8620_hw_on(ctx);
-       clk_prepare_enable(ctx->clk_xtal);
        sii8620_hw_reset(ctx);
        msleep(100);
 
@@ -1443,7 +1443,6 @@ static void sii8620_cable_in(struct sii8620 *ctx)
 static void sii8620_cable_out(struct sii8620 *ctx)
 {
        disable_irq(to_i2c_client(ctx->dev)->irq);
-       clk_disable_unprepare(ctx->clk_xtal);
        sii8620_hw_off(ctx);
 }